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

doi:10.13466/j.cnki.lczyyj.2024.05.005

Abstract

Abstract:

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.

Key words: tree mortality, dynamic, biotic factors, structural equation modeling, the Baotianman National Nature Reserve

CLC Number:

S718.52

LIU Shengyun, YANG Liu, WANG Guanjie, SHI Kun, YI Liuliu, LI Jinsheng, YU Chenyi, WANG Ting. Dynamics and Driving Factors of Tree Mortality in Quercus×leana Forests in the Baotianman National Nature Reserve[J]. Forest and Grassland Resources Research, 2024, (5): 38-47.

Figures/Tables 6

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海拔/m	纬度	经度	年份	物种数/种	平均胸径/cm	平均树高/m	林分密度/(株/hm²)
1 380~1 420	33°49'57.12″— 33°49'57.98″N	111°92'21.56″— 111°92'22.23″E	2009	92	9.53±1.06	10.06±1.21	2 627±471
1 380~1 420	33°49'57.12″— 33°49'57.98″N	111°92'21.56″— 111°92'22.23″E	2019	96	13.51±2.15	12.49±2.62	1 488±273

树种	重要值/%		平均胸径/cm			死亡率/%
树种	2009	2019	2009	2019		2009—2019
锐齿槲栎Quercus aliena var.acutiserrata	25.32	24.05	19.54	27.78	4.55
短柄枹栎Quercus serrata var.brevipetiolata	6.78	6.84	13.44	18.30	4.04
华山松Pinus armandi	5.33	4.77	19.27	24.82	4.73
栓皮栎Quercus variabilis	3.82	4.19	20.96	28.32	3.11
四照花Cornus kousa	3.47	4.29	3.81	5.02	2.22
三桠乌药Lindera obtusiloba	2.50	1.38	4.09	5.12	9.76
卫矛Euonymus alatus	2.39	1.59	2.63	3.24	7.85
茅栗Castanea seguinii	2.35	1.74	12.89	21.58	8.75
鹅耳枥Carpinus turczaninovii	1.88	2.38	4.69	5.71	1.74
樱桃Prunus pseudocerasus	1.67	1.58	3.30	4.55	4.73