Table of Content

28 October 2024, Issue 5

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Integrated Management and Administration

The Impact of Digital Economy on Forestry Green Total Factor Productivity

MEI Yuntian, WANG Wenqi, ZOU Quancheng, CHAO Bixiao, CHEN Jiayu, FENG Tianchu, LI Xiaoliang

2024,(5):  1-10.  doi:10.13466/j.cnki.lczyyj.2024.05.001

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The integration of digitalization and ecological practices is an important strategic choice for forming new quality productivity in forestry.This article is based on the perspective of achieving the country’s goals of peak carbon dioxide emissions by 2030 and carbon neutrality by 2060,and green development of the forestry industry.Based on panel data from 2011 to 2020 among Chinese provinces,the study assesses the comprehensive impact of the digital economy on Forestry Green Total Factor Productivity(FGTFP)across different regions.Panel regression and threshold effect models were used to analyze the impact and mechanism of the digital economy on FGTFP.The findings indicate a significant enhancement of FGTFP attributable to the digital economy,particularly pronounced in the central and eastern provinces and regions benefiting from robust financial backing for forestry initiatives.Mechanism analysis shows that the digital economy effectively improves FGTFP by promoting regional forestry technology innovation.In the threshold test,the development level of the Internet has a triple threshold.The digital economy has a significant nonlinear impact on improving regional FGTFP through different levels of Internet development.This impact shows a pattern of initial increase followed by a decline in marginal returns.Based on the research results,it is further suggested that the government should actively promote the deep integration of the digital economy and the forestry industry,improve the level of forestry technology innovation,increase financial support for forestry,guide local forestry to carry out digital reform according to local conditions,pay attention to the efficiency of forestry digital element allocation,and improve the synergy level between the digital economy and the green development of forestry.

Catastrophic Risk Diversification Mechanism of Forest Insurance

FAN Juanjuan, JIAO Zihan, NING Wei, ZHANG Yuxing

2024,(5):  11-18.  doi:10.13466/j.cnki.lczyyj.2024.05.002

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Forest insurance is an essential component of agricultural insurance and a significant branch of green insurance in China.Due to the systemic and unique characteristics of forest insurance,it is closely related to catastrophe risk,with its dispersion mechanism being a key issue in forest risk management.Currently,China primarily relies on three mechanisms to address catastrophe risks in forest insurance:reinsurance,coinsurance bodies,and catastrophe risk reserves.However,there are prevalent issues in practice,such as a lack of catastrophe risk awareness among forest insurance operators and ‘free-riding’ within the coinsurance bodies.By examining the more sophisticated catastrophe risk dispersion systems in the United States and Japan and considering China's national conditions,this study proposes practical recommendations to enhance the catastrophe risk awareness of forest insurance operators and establish effective coinsurance systems.

Realization of Asset Value of the State-owned Forest and Grassland Resources under the Principal-agent Mechanism—A Case Study of the Qishan Grassland Financing Model in Yunyang County,Chongqing

ZHANG Yi, LI Zheng, Gong Fuhai, LI Yonghong, WANG Yalin, TANG Zengwei, LIU Jian, XIAO He

2024,(5):  19-28.  doi:10.13466/j.cnki.lczyyj.2024.05.003

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Building on the explanation of the significance and implications of realizing the value of the state-owned forest and grassland resources assets,this study explores four dimensions of asset value realization under the conventional natural resources management system:rights protection,implementation strategies,asset valuation,and property certificate.Commencing with the establishing and enhancement of the principal-agent mechanism of the state-owned natural resources asset.It proposes a systematic framework and strategic measures to build a hierarchical agency that ensures owner accountability,comprehensive asset allocation,precise asset management,and an enriched framework of rights.Aiming to furnish both theoretical and practical guidance for enhancing the value of the state-owned forest and grassland resources asset through the perspective of the principal-agent mechanism.The study combines the typical case of the Qishan grassland financing model to analyze the operational path and institutional mechanisms for optimizing asset value realization.This is intended to establish a theoretical foundation and contribute practical insights into the asset value realization of state-owned forest and grassland resources.

Scientific Research

Dynamic Analysis of Desertification and Sandification of Ningxia Province from 2004—2019

TIAN Naling, LI Qingbo, GUO Liming, YU Haiyan, LI Fan, WEI Yaofeng, DOU Jiande, YUE Peng

2024,(5):  29-37.  doi:10.13466/j.cnki.lczyyj.2024.05.004

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Ningxia is one of the regions that are affected by desertification and sandification.Research adopts the 4 consecutive years of desertification and sandification monitoring data from 2004 to 2019,analyzed the dynamic changes of Ningxia’s desertification and sandification land.It provides evidence for measures of Ningxia desertification and sandification,and assesses effectiveness analysis and formulation of prevention policies and planning.1)The area affected by desertification and sandification in Ningxia has decreased.From 2004 to 2019,the area of desertification land decreased by 33.937×10⁴ hm²,and the reduction rate was 11.4%;the area of sandification land decreased by 17.943×10⁴ hm²,and the reduction rate was 15.2%.2)The degree of Ningxia desertification and sandification land was reduced.The area of mild desertification land and moderate sandification land was increasing,other degrees of the area of desertification and desertification land were decreasing.3)In terms of land use transition,the largest shift from cultivated and forest lands has been toward grasslands.Grassland is the goal of desertification and sandification land governance at this stage.4)Transfer matrix analysis shows that in the three monitoring periods(2004—2009,2009—2014,2014—2019),the area of desertification land was transformed into non-desertification or exiting the area of desertified land to 11.101×10⁴ hm²、29.006×10⁴ hm² and 26.563×10⁴ hm²,respectively.The area of sandification land was transformed into non-sandification or exiting the area of sandification land to 11.29×10⁴ hm²、19.700×10⁴ hm² and 18.007×10⁴ hm²,respectively.5)Desertification and sandification processes also repeatedly manifest in conditions of land damage and destruction.The desert ecosystems and ecological conditions of sandy areas in Ningxia remain stable and favorable.In the future,grasslands governance of desertification and sandification will be the main governance targets.Concurrently,stringent measures should be implemented to prevent the rebound of governance effectiveness.

Dynamics and Driving Factors of Tree Mortality in Quercus×leana Forests in the Baotianman National Nature Reserve

LIU Shengyun, YANG Liu, WANG Guanjie, SHI Kun, YI Liuliu, LI Jinsheng, YU Chenyi, WANG Ting

2024,(5):  38-47.  doi:10.13466/j.cnki.lczyyj.2024.05.005

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Tree mortality,a crucial ecological process affecting the dynamics of forest communities,is influenced by the combined effects of various factors.It has become a focal issue to investigate the dynamics of tree mortality and its driving factorsin forest ecosystems.Quercus aliena var.acutiserrata is an important deciduous broadleaf species in Baotianman National Nature Reserve,located on the southern slope of the Funiu Mountains,China.Based on the two survey data(2009 and 2019)from the 36 permanent plots(20 m×20 m),the trees in the sample plot were divided into 7 diameter classes according to breast height diameter(D_BH),with Class I being(1 cm≤D_BH<5 cm),each subsequent class increasing by 5 cm,up to Class VII(30 cm≤D_BH).Multiple regression,generalize linear model and structural equation modelling were used to discuss the effect of some biotic factors(such as competition action,stand density and species diversity)on tree mortality in the Q.aliena var.acutiserrata forest.1)Mortality rates were highest in the smallest DBH class(D_BH<5 cm)and decreased with increasing DBH.2)Biotic factors showed different effects on tree mortality rates.Competition intensity,basal area increment,and stand density exerted positive effect on tree mortality(P<0.05),whereas DBH coefficient of variation,DBH Gini coefficient,mean stand DBH,and species diversity had negative roles on tree mortality(P<0.05).3)Structural equation modeling showed that all biotic factors,except for the Simpson diversity index,significantly influenced tree mortality rates.Competition intensity(CI)and the mean basal area(MBA)of stand individuals had significant positive(0.398)and negative(-0.446)effects on tree mortality,respectively.On the whole,the mortality rate of Q.aliena var.acutiserrata forest on the Baotianman National Nature Reserve is influenced by multiple biological factors,in which competition intensity and mean basal area of the stand individuals have the most significant effect.These findings provide scientific support for the sustainable management and ecosystem conservation of forests in this region.

Comparison of Dummy Variable Model and Mixed Model: A Case Study on Constructing Biomass Models for Cunninghamia lanceolata and Larix spp.Forests in Different Regions

ZOU Wentao, ZENG Weisheng, YANG Xueyun, WEN Xuexiang

2024,(5):  48-55.  doi:10.13466/j.cnki.lczyyj.2024.05.006

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This study develops and compares dummy variable models and mixed models for biomass modeling of Cunninghamia lanceolata and Larix spp.forests.Using data from 3 152 Cunninghamia lanceolata and 2 495 Larix spp.permanet sample plots collected during the 9^th national forest inventory.Indicative variables representing three distinct regions were incorporated as either dummy or random variables in the models.The results demonstrated that the determination coefficients(R²)of the biomass models from two approaches for Cunninghamia lanceolata and Larix spp.forests in different regions exceeded 0.9.The models achieved mean prediction errors(E_MP)under 1.5%,the total relative errors(E_TR)near zero,the average systematic errors(E_AS)within ±5%;and the mean percent standard error(E_MPS) almost under 15%.While biomass models for Cunninghamia lanceolata forests differed among East,Central-South and Southwest China,difference between South and Southwest was not significant.There were significant differences among the biomass models of Larix spp.forests in Northeast,North and West China.The study confirms that both dummy and mixed variable models can effectively compare and analyze regional and typological differences in stand-level biomass.However,the mixed model proved more robust and applicable.The developed biomass models offer a scientific foundation for estimating biomass of Cunninghamia lanceolata and Larix spp.forests on national and regional scales.

Soil Moisture and Carbon-Nitrogen Content on the Productivity of Flat Stubble Caragana korshinskii Forest in the Northwestern Shanxi Sandstorm Region

XUE Yue, ZHAO Fengxia, LI Yajie, JI Wenxia, MENG Dan

2024,(5):  56-65.  doi:10.13466/j.cnki.lczyyj.2024.05.007

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Since the implementation of the Three-North(i.e.,Northeast China,North China and Northwest China)Shelterbelt Forest Program,Caragana korshinskii forest has become a crucial ecological barrier for wind prevention and sand fixation in the northwestern Shanxi sandstorm region.Therefore,investigating the impact mechanisms of soil moisture and carbon-nitrogen content on the aboveground net primary productivity(ANPP)of Caragana korshinskii under stubble disturbance is vital for local artificial vegetation construction and regional ecological stability.In this study,flat stubble Caragana korshinskii in its first-year in the northwestern Shanxi sandstorm region was used as the research object.Independent sample T-tests,linear regression models,and random forest models were employed to study the changes in productivity of flat stubble Caragana korshinskii and the effects of soil moisture and soil carbon-nitrogen content at different radial distances and soil layers on this productivity.1)The ANPP of the un-flat-stubble Caragana korshinskii was significantly higher than that of the flat stubble Caragana korshinskii 20~<40 cm (P<0.01).Soil moisture content at depth and 0.25 m from the stem(R²=0.456,P=0.016),soil total nitrogen content at 40~<60 cm(R²=0.363,P=0.038)and soil moisture content at depth and 0.5 m from the stem(R²=0.465,P=0.015)were significantly positively correlated with the productivity of flat stubble Caragana korshinskii forest.2)The random forest model results indicated that the most important soil limiting factor affecting ANPP changes after stubble disturbance was soil moisture content at 20~<40 cm depth and 0.5 m from the stem.The study suggests that future management of Caragana korshinskii forests should focus on soil moisture and carbon-nitrogen content at 20~<60 cm soil depth in root-dense areas,particularly the response of soil moisture at the 20~<40 cm soil layer to ANPP.This approach will optimize the restoration strategy of Caragana korshinskii forests in the northwestern Shanxi sandstorm region and enhance the sustainability of the ecological functions of the Three-North Shelterbelt Program.

Survey and Analysis of Bird Diversity in The Erguna Wetland,Inner Mongolia

WANG Qiyuan, JI Penghao, XUE Lei, GAO Runhong

2024,(5):  66-76.  doi:10.13466/j.cnki.lczyyj.2024.05.008

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In the spring,autumn and winter of 2022,a survey of bird diversity was carried out in Erguna wetland by using line transect method and site sampling method. 1)A total of 14 139 birds and 115 species belonging to 19 orders and 40 families were recorded. 2)There were 78 species of Palaearctic,Holoearctic and Northeast type,accounting for 67.83% of the total species. 3)In terms of bird fauna,Palearctic species and widespread species are the main species,and in terms of resident types,summer migratory birds,resident birds and travelers are absolutely superior. 4)There are 39 species of protected birds,including 6 species under national priority protection,26 species under national secondary protection,24 species of birds listed in CITES Appendix II and 2 species listed in CITES Appendix I. 5)In terms of bird ecological types,songbirds had the largest number of species(57 species),but a small number(575),while swimming birds and wading birds had a total of 35 species(13 468 species),accounting for 95.25% of the total number of birds in this survey. 6)There were seasonal dynamic differences in bird community composition,with the highest Shannon-Wiener diversity index and Pielou evenness index in autumn and the lowest in spring,and the lower Sorensen index among different seasons. 7)The composition of bird community was greatly affected by habitat types. The Shannon-Wiener diversity index and Pielou evenness index were the highest in forest shrub,the lowest in farmland,and the Sorensen index among different habitat types was low. The results of the survey reflect the status quo of bird resources in Erguna wetland,and can provide a reference for the management and protection of birds in the reserve.

Population Structure and Dynamic Characteristics of Heritiera parvifolia in Diaoluo Mountain of Hainan Tropical Rainforest National Park

SHANG Naiyan, YANG Xiaobo, LI Donghai, LIU Rentong, SU Xin, SHI Jiaqi, DU Chunyan

2024,(5):  77-85.  doi:10.13466/j.cnki.lczyyj.2024.05.009

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This study investigates the survival status and causes of endangerment of the wild population of the Heritiera parvifolia in Diaoluo Mountain,key protected wild plant of rational importance located within Hainan Tropical Rainforest National Park.The study analyzed and predicted population structure and dynamics using diameter class,the quantity dynamic index,static life table,survival curve,survival function,and time series prediction model.The results show that:1)The age class structure of Heritiera parvifolia population indicated an increasing trend.However,a 32.58% decline was observed from the age classes of Ⅱ to III,suggesting recruitment limitation.2)The quantity dynamic index(V₇)was -0.666 7 between the VII and VIII age classes.This suggested a higher risk of decline among older individuals.Additionally,the non-interference dynamic index(V_pi),random interference dynamic index(V'_pi) and random interference risk probability(P_max)were all greater than zero,with V_pi significantly exceeding V'_pi. This highlights the population’s sensitivity to external disturbances.3)The life expectancy(e_x)peaked at age class III,and the survival curve resembled a Deevey-Ⅱ type.4)Survival functional analysis revealed a pattern of early-stage decline,significant fluctuations in the middle stage,and gradual decline in the later stages of the Heritiera parvifolia population.5)Projections for the next 2,4,6 and 8 age classes in the future indicate varying degrees of decline in individuals within age classes II and VIII.The primary factors contributing to the endangerment of Heritiera parvifolia include low seedling survival rates,intense intra and interspecific competition,heightened risk of decline among older individuals,and human disturbances.

The Impact of Natural Recovery of Diseased and Pest-infected Treescutting on the Niche and Diversity of Secondary Pinus massoniana Forests

WU Jilai, MAO Yangjun, CHEN Yangen, HU Ao, WU Yanping, SHI Yan, WANG Yixiang

2024,(5):  86-95.  doi:10.13466/j.cnki.lczyyj.2024.05.010

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This study investigates the biodiversity and niche dynamics in Pinus massoniana forests(PMF)following thinning of trees affected by pine wilt disease to facilitate natural restoration,we aim to provide a scientific basis for the management of PMF stands after sanitation cutting.Employing a PMF stand unaffected by pine wilt disease as the control(CK),the forest stands with moderate cutting and restoration for 5 years(MT₅),moderate cutting and restoration for 15 years(MT₁₅),heavy cutting and restoration for 5 years(HT₅),and heavy cutting and restoration for 15 years(HT₁₅)were selected respectively assess how varying degrees of thinning and periods of natural restoration influence species composition,niche width,niche overlap,and biodiversity of PMF.1)Compared with CK,the important value of P.massoniana,niche width,and the average niche overlap between P.massoniana and other tree species in the forest stands after the cutting of epidemic wood generally decreased.2)Under the same natural restoration duration,the average important value of P.massoniana,niche width,and the average niche overlap between P.massoniana and other tree species decreased with increasing cutting intensity,and the important value of broad-leaved trees increased with increasing cutting intensity.3)Under the same cutting intensity,the average important value of P.massoniana,niche width,and the average niche overlap between P.massoniana and other tree species decreased with increasing natural restoration years,and the important value of broad-leaved trees increased with increasing natural restoration years.4)When the natural restoration lasted for 15 years,the species richness of the secondary forest of P.massoniana after heavy cutting was significantly higher than that after moderate cutting(P<0.05),while the difference was not significant when the natural restoration lasted for 5 years(P>0.05).5)Under the same cutting intensity,the species richness,Shannon-Wiener index,and Simpson index of the secondary forest of P.massoniana with natural restoration for 15 years were significantly higher than those with natural restoration for 5 years(P<0.05).Following thinning of P.massoniana,extended periods of natural restoration correlate with reduced significance and niche breadth of P.massoniana,alongside an increase in the significance of broad-leaved species.Additionally,the niche overlap between P.massoniana and other tree species decreases,resulting in higher species diversity.Intense thinning accelerates these ecological transitions more effectively than moderate thinning.

Impact of Different Vegetation Restoration Types on Soil in the Wind-sand Inflow Section of the Hobq Desert

HAO Siran, MENG Zhongju

2024,(5):  96-105.  doi:10.13466/j.cnki.lczyyj.2024.05.011

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In order to explore the influence of sandy vegetation restoration on the properties of wind-sand soil,which is crucial for the rational conservation and adaptive management of regional soil and water resources.The research focuses on four typical communities of artificial vegetation communities in the Hobq Desert sand inflow section:18-year-old Corethrodendron scoparium forest(HB),Salix matsudana+Populus simonii+Caragana korshinkii+Elaeagnus angustifolia mixed forest(HYNZ),Populus simonii+Pinus sylvestris var.mongholica Litv.mixed forest(YS),Populus simonii+Salix psammophila mixed forest(YL).The differences in soil properties under the four vegetation restoration types were comparatively analyzed through the combination of in situ sampling in the field and indoor laboratory tests.1)By planting artificial vegetation,the content of fine particulate matter of soil under different vegetation restoration types was significantly increased(P<0.05),and the content of coarse sand particles was decreased.2)Soil pH under different vegetation restoration types was decreased by 0.18~0.83.The effect of the four vegetation types on the electrical conductivity showed that HB>YL>HYNZ>YS.3)Soil bulk density significantly decreased under all vegetation restoration types (P<0.05),with the most considerable change observed in the surface layer.4)After vegetation restoration,soil nutrients were improved to different degrees. There was an obvious epimerization characteristic. The increase of mixed forests was higher than that of Corethrodendron scoparium fores. Artificial vegetation restoration promotes soil recovery in the Hobq Desert sands inlet section by developing fine-grained soil structures and enhancing soil nutrient cycling. Based on the prevailing soil and water resources,it is recommended to construct a protective vegetation system with a diverse array of arboreal and herbaceous species,which is more conducive to the long-term restoration of the regional ecosystem in the Hobq Desert region.

Soil Physicochemical Properties and Plant Diversity Characteristics of Cupressus funebris with Different Stand Ages in Limestone Mountain Areas

YANG Yuhao, WANG Lingling, ZHANG Yong, ZHANG Quanzhi, SUN Hanjing, WANG Wenpeng, ZHOU Benzhi, WANG Zeng

2024,(5):  106-115.  doi:10.13466/j.cnki.lczyyj.2024.05.012

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The investigation of the impact of Cupressus funebris forests of varying ages on soil physicochemical properties and plant diversity in limestone mountainous regions is of paramount importance for vegetation restoration in fragile ecosystems within rocky desertification zones.Focusing on Cupressus funebris forests in the limestone mountainous areas of Fuyang District,Hangzhou City,Zhejiang Province,China,this study categorized the forests into control(limestone non-stocked land),young forests,middle-aged forests,and near-mature forests.Employing the space-for-time substitution method,along with Pearson correlation analysis and Redundancy Analysis(RDA),the study explored the influence of Cupressus funebris forests of different ages on soil physicochemical properties and plant diversity in limestone mountainous regions.1)The soil bulk density of Cupressus funebris forests of all ages was lower than that of non-stocked land,whereas the maximum water-holding capacity,capillary water-holding capacity,minimum water-holding capacity,and moisture content of the soil,were higher.Among them,middle-aged forests had the lowest soil bulk density and the highest water-holding capacity,while young forests had the highest moisture content.2)The soil organic carbon,total nitrogen,and hydrolyzable nitrogen contents of Cupressus funebris forests of different ages were higher than those of non-stocked land,with middle-aged forests exhibiting the highest contents.3)The species richness of Cupressus funebris forests of all ages was higher than that of non-stocked land.Middle-aged forests exhibited the greatest species richness in both tree and herb layers,whereas young forests showed the greatest richness in the shrub layer.The Simpson dominance index of Cupressus funebris forests of all ages was higher than that of non-stocked land,and the Shannon-Wiener diversity index of young and middle-aged forests was significantly higher than that of non-stocked land.4)Correlation analysis and RDA indicated that pH was the primary factor influencing soil physicochemical properties and plant diversity in the region,followed by water-holding capacity,bulk density,moisture content,total phosphorus,and hydrolyzable nitrogen.In summary,the soil physicochemical properties and plant diversity of Cupressus funebris forests in limestone mountainous regions were significantly superior to those of non-stocked land,with middle-aged forests demonstrating the best overall performance.Cupressus funebris had a significant effect on improving soil in limestone mountainous regions,with effects varying by forest age.

Regularity and Physiological Characteristics of Leaf Color Change During the Growth Period of Quercus mongolica

YUAN Yangchen, PANG Jiushuai, YU haidong, ZHANG jiang, CHEN huimin, ZHANG bingying, LIU jialin, HUO wei

2024,(5):  116-127.  doi:10.13466/j.cnki.lczyyj.2024.05.013

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This study investigates the alterations in physiological substances during the leaf coloration of Quercus mongolica,aiming to provide foundational data for breeding new varieties and enriching the genetic resources of colored-leaf tree species.Using young leaf stage(S1),green leaf stage(S2-S4),color changing stage(S5),and red leaf stage(S6)leaves as test materials.Measurement of changes in leaf pigments,leaf color parameters,osmoregulatory substances,nitrogen(N),phosphorus(P),antioxidant enzymes,and MDA at different stages.This study investigates the alterations in physiological substances during the leaf coloration of Q.mongolica,aiming to provide foundational data for breeding new varieties and enriching the genetic resources of colored-leaf tree species.1)During the color changing stage of leaves,the contents of chlorophyll decreased,while the content of carotenoids increased and anthocyanins accumulated in large quantities.Carotenoid to chlorophyll ratio and anthocyanin to chlorophyll ration showed an upward trend,while anthocyanin to carotenoid ratio showed little change.2)The leaf color parameter a^* showed a significant upward trend,while L^*,b^*,and C first decreased and then increased.The color changing stage of hue(H)and saturation(s)values increased sharply,while hue angle(h)decreased significantly.3)The N and P contents of Q.mongolicum leaves decreased overall,while the proline content increased.The soluble protein content decreased during color changing stage,and soluble sugars increased.The change range of Peroxidase(POD) was small,while Superoxide dismutase(SOD) showed a gentle upward trend.Catalase(CAT)activity and malondialdehyde(MDA)levels increased significantly during the color changing stage.4)Anthocyanins were highly significantly positively correlated with a^*,and together they were highly significantly positively correlated with proline,anthocyanins to chlorophyll ratio.There was a significant positive correlation with MDA and SOD,a significant negative correlation with N,chlorophyll,and a negative correlation with P.5)Among the three principal components,principal component 1 had the highest eigenvalue and contribution rate,and the eigenvectors of anthocyanins to chlorophyll ratio are the largest.Chlorophyll degradation,anthocyanin accumulation,and a significant increase in the anthocyanin to chlorophyll ratio were identified as the primary physiological factors influencing the red coloration of Q.mongolicum leaves.During the color changing stage,the content of proline and soluble sugars increased,while the content of N and P decreased,and the content of MDA increased,and the activities of SOD and CAT were enhanced,synergistically promoting anthocyanin synthesis and leaf coloration.

Technical Application

Simulation of Canyon Wind Field and Forest Fire Spread Based on WindNinja Model

WANG Ao, WANG Chenghu, GAO Guiyun, WANG Mingyu, SU Haiyan, WU Ningyu

2024,(5):  128-137.  doi:10.13466/j.cnki.lczyyj.2024.05.014

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This study focuses on the effect of local wind variability on the spread of forest fires in high mountain and valley areas where forest fire accidents occur frequently,especially in complex terrain.Take the March 28 forest fire in Muli Tibetan Autonomous County,Liangshan Yi Autonomous Prefecture,Sichuan Province,as a case study,the WindNinja model was applied to simulate the canyon wind field,which was input into the FARSITE forest fire spread model.Both the average surface and the canyon wind fields,as simulated by WindNinja,were respectively coupled with the FARSITE forest fire spread simulation.This comparison aimed to evaluate how the canyon wind field,as simulated by WindNinja,affects trends in forest fire spread.Simulation results show that with the Silhouette Coefficient(SC)as an evaluation index,the accuracy of forest fire spread simulation,as influenced by canyon wind field simulated by the WindNinja model will be improved at 19:00 on March 29,19:00 on March 30 and 19:00 on April 1.The three time points were 0.94,0.78 and 0.44,respectively,which were 0.12,0.07 and 0.04 higher than the average surface wind field,respectively.The results show that the coupling of the WindNinja canyon wind field simulation with the FARSITE forest fire spread model effectively simulates related fire behavior.Combined with the forest fire spread model using WindNinja simulated wind field,the parts of wind field are more accurately considered.The simulation results are more consistent with the actual range,and have higher similarity with the average surface wind field.

Analysis of Ecological Landscape Pattern Changes in Gongga Mountain National Nature Reserve From 1996 to 2022

YE Danni, YAO Manqing, FU Hong

2024,(5):  138-147.  doi:10.13466/j.cnki.lczyyj.2024.05.015

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The Gongga Mountain National Nature Reserve plays a vital ecological role,focusing on the protection of alpine biodiversity and diverse ecosystems.Exploring the evolution characteristics of its landscape pattern is of crucial significance for maintaining the integrity of the structure and function of the unique ecosystem and formulating corresponding biodiversity protection plans.Long-term monitoring and analysis of landscape patterns also help identify trends in geological disaster risks,thereby mitigating potential losses.Based on remote sensing data and the Geographic Information System(GIS),remote sensing images in 1996,2009 and 2022 were selected to analyze the characteristics of landscape pattern changes in the Gongga Mountain National Nature Reserve over the 26 years before and after the 2008 earthquake.1)Grasslands and forests dominate the Gongga Mountain National Nature Reserve,comprising 85% of the total area,while ice and snow areas have steadily declined.2)Between 1996 and 2009,the earthquake significantly reduced the number of landscape patches,leading to decreased landscape dominance,simplified landscape types,and intensified fragmentation.3)From 2010 to 2022,ecological protection efforts slowed the reduction in patches,reduced fragmentation,and improved landscape connectivity.

Assessment and Analysis of Carbon Storage in Aksu Kekeya Ecosystem Based on the InVEST Model

ZHANG Zhaoxiang, LUO Qinghong, HE Miao, NING Husen, ZHANG Zhijun, BAO Qiang, SUN Qian

2024,(5):  148-156.  doi:10.13466/j.cnki.lczyyj.2024.05.016

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Ecosystem carbon storage is a key indicator of ecosystem function and plays a crucial role in maintaining regional carbon balance,guiding ecological restoration,and informing management strategies.This study aims to explore the spatial distribution characteristics of carbon storage in the Kekeya ecosystem and compare carbon storage across different ecosystem level susing 2020 land use data,forest inventory data,and standard plot survey data.Carbon storage in the Kekeya engineering area was assessed using the carbon module of the InVEST model.1)The total carbon density of the Kekeya engineering area is 71.76 t/hm²,with total carbon storage 8.27×10⁶ t.Carbon storage across ecosystem levels is distributed as follows:soil carbon storage(6.16×10⁶ t)>underground biological carbon storage(1.12×10⁶ t)>above-ground biological carbon storage(9.64×10⁵ t)>dead organic carbon storage(2.59×10⁴ t).Carbon storage by land types is as follows:Forest land(6.21×10⁶ t)>cultivated land(9.82×10⁵ t)>grassland(5.56×10⁵ t)>construction land(3.69×10⁵ t)>unused land(1.07×10⁵ t)>water area(4.32×10⁴ t).2)Carbon storage in the Kekeya engineering area is spatially uneven,with the central,eastern and southeast regions exhibiting the highest storage,shows moderate storage,and the southwestern region has the lowest.Aboveground carbon storage in Kekeya engineering area is strongly positively correlated with the underground biomass layer and the soil carbon.The carbon storage within 60 cm of soil layer in the Kekeya engineering area are 6.16×10⁶ t,accounting for 74.49% of the total carbon storage in the Kekeya ecosystem.Soil carbon is the main carbon pool in the Kekeya engineering area.Future ecological restoration efforts should prioritize expanding forested land and protecting cultivated land to enhance ecosystem stability and health in the Kekeya region.This approach provides valuable insights for designing ecological restoration projects in the Tarim River Basin.

Evaluation and Analysis of Influencing Factors of Sustainable Development of Forest Based Health and Wellness Industry in Beijing-Tianjin-Hebei Region

ZHOU Xuanying, ZHANG Mengwan, MA Ning

2024,(5):  157-165.  doi:10.13466/j.cnki.lczyyj.2024.05.017

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The forest based health and wellness industry is increasingly vital to advancing ecological civilization and promoting the Healthy China.However,the sustainable development of forest recreation industry faces challenges in regional coordination,resource protection and infrastructure development.This study uses the Beijing-Tianjin-Hebei region as a case study to construct a sustainable development indicator system for the forest-based health and wellness industry,selecting 21 evaluation indicators across four dimensions:environment,supply,service,and support. The coupling coordination degree method and the grey correlation degree method were applied to evaluate the sustainable development level and identify key influencing factors for the forest based health and wellness industry in the Beijing-Tianjin-Hebei region from 2017 to 2021.Results show that the sustainable development level of the forest-based wellness industry in the region initially increased but later declined from 2017 to 2021,while overall remaining at a favorable level.The supply sustainability level showed a steady increase,while values in other dimensions exhibited fluctuating trends of rise and fall.Key indicators include number of good air days,relative humidity,acoustic environment quality,sewage treatment rate,average temperature,and the medical care price index.The findings provide data support for the sustainable development of the forest based health industry and regional coordination in the Beijing-Tianjin-Hebei region,contributing to building China into a country with a good environment.

Review

Progress on Hyperspectral Remote Sensing Inversion Method for Vegetation Chlorophyll Content

MA Rongfei, CHEN Yan, HOU Peng, REN Xiaoqi

2024,(5):  166-178.  doi:10.13466/j.cnki.lczyyj.2024.05.018

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Chlorophyll content is crucial for the photosynthetic capacity of plants and serves as an important indicator of vegetation growth status.Accurate measurement of chlorophyll content is essential for assessing plant health,optimizing fertilizer management,and evaluating crop yields.However,traditional measurement methods are time-consuming and labor-intensive.In recent years,hyperspectral remote sensing technology has been rapidly developing as a cutting-edge technology,and using hyperspectral data for estimating chlorophyll content has become an important approach.This paper provides a comprehensively review of the development of typical airborne star-borne hyperspectral imagers both domestically and internationally.By analyzing relevant literature,the paper analyzes the advantages and limitations of three methods,namely,spectral vegetation index construction,hyperspectral red-edge positional parameters and machine learning algorithms,in inverting chlorophyll from hyperspectral data,and points out the shortcomings of the current development of hyperspectral remote sensing and the research on quantitative inversion of vegetation chlorophyll,and proposes the future research direction.