Photosynthetic Characteristics and Carbon Fixation and Oxygen Release Capacity of 12 Tree Species in Baotou City

doi:10.13466/j.cnki.lczyyj.2024.06.012

Abstract

Abstract:

Studying the photosynthetic characteristics,carbon fixation,and oxygen release capacity of tree species,along with screening the dominant species for carbon fixation and oxygen release,provides important guidance for the development of forestry carbon sinks and ecological environment construction.This study focused on 12 tree species that are predominant in Baotou City,and their photosynthetic physiological parameters were measured using a CI-340 portable photosynthesis system.Pearson correlation and systematic cluster analysis were used to explore the diurnal variation in the net photosynthetic rate of tree species and its relationship with environmental factors.Additionally,and the carbon fixation and oxygen release capacity of tree species was evaluated.1)Among the 12 tree species,Ulmus pumila,Pinus sylvestris var. mongholica Litv.and Picea asperata showed unimodal diurnal variation of the net photosynthetic rate.The bimodal tree species are Pinus tabuliformis,Populus simoniiand and Reaumuria songarica.2)Tree species with a single peak of water use efficiency were Picea asperata,Juniperus rigida and Pinus tabuliformis.The tree species with a bimodal type are Sorbaria sorbifolia;the tree species that decreased first and then increased were Ulmus pumila,Pinus sylvestris var.mongholica Litv.and Platycladus orientalis.3)The tree with the highest net photosynthetic rate was Ulmus pumila.while the shrub with the highest net photosynthetic rate was Tamarix chinensis.The tree with the strongest water use efficiency is Pinus sylvestris var.mongholica Litv.,and the shrub with the strongest water use efficiency is Caragana tibetica.4)Net photosynthetic rate was significantly positively correlated with both transpiration rate and stomatal conductance.5)The carbon fixation and oxygen release capacity of tree species in Baotou City can be classified into three grades according based on strength:Ulmus pumila and Populus simonii are grade I;Pinus sylvestris var.mongholica Litv.is grade II;and Picea asperata.,Platycladus orientalis,Pinus tabuliformis and Juniperus rigida are grade III.The carbon fixation and oxygen release capacities of shrub species were classified into three grades:Tamarix chinensis was grade I;Juniperus sabina and Sorbaria sorbifolia are grade II;and Reaumuria songarica and Caragana tibetica Kom.are grade III.It is recommended to select Ulmus pumila,Populus simonii and Tamarix chinensis as the preferred tree species for carbon fixation and oxygen release.In areas with poor water conditions,Pinus sylvestris var.mongholica Litv.,Picea asperata and Caragana tibetica are recommended.

Key words: Baotou City, net photosynthetic rate, water use efficiency, carbon fixation and oxygen release

CLC Number:

S718

WU Le, GAO Runhong, HAN Shumin, JIA Kexin. Photosynthetic Characteristics and Carbon Fixation and Oxygen Release Capacity of 12 Tree Species in Baotou City[J]. Forest and Grassland Resources Research, 2024, (6): 98-106.

Figures/Tables 7

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References 25

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生活型	树种	株高/m	胸径/cm	冠幅/m²
乔木	榆Ulmus pumila	5.84±0.43	10.50±0.45	14.70±1.13
	樟子松Pinus sylvestris var.mongholica Litv.	4.88±0.32	8.83±0.42	35.75±2.43
	云杉Picea asperata	2.53±0.36	3.09±0.33	6.40±0.54
	杜松Juniperus rigida	4.12±0.27	5.93±0.24	14.20±0.75
	油松Pinus tabuliformis	13.03±0.54	30.61±1.16	18.00±0.78
	小叶杨Populus simonii	13.19±0.65	19.49±0.42	45.70±2.43
	侧柏Platycladus orientalis	2.10±0.32	3.10±0.35	6.57±0.43
灌木	红砂Reaumuria songarica	0.14±0.04	1.01±0.04	2.24±0.06
	毛刺锦鸡儿Caragana tibetica	0.32±0.12	1.43±0.07	4.18±0.22
	叉子圆柏Juniperus sabina	1.29±0.13	2.07±0.22	2.13±0.15
	柽柳Tamarix chinensis	2.36±0.22	3.82±0.21	9.73±0.27
	珍珠梅Sorbaria sorbifolia	1.17±0.15	2.52±0.24	5.70±0.25

生活型	树种	净光合速率/ [μmol/(m²·s)]	蒸腾速率/ [mmol/(m²·s)]	气孔导度/ [mmol/(m²·s)]	饱和水汽压亏缺/kPa	光合有效辐射/ [μmol/(m²·s)]
乔木	榆Ulmus pumila	8.83±0.09	1.60±0.02	50.32±3.34	3.04±0.25	1191.66±28.60
	樟子松Pinus sylvestris var. mongholica Litv.	4.17±0.17	0.74±0.05	24.49±2.82	2.95±0.20	1071.19±27.72
	云杉Picea asperata	2.32±0.06	0.26±0.04	6.21±1.39	3.57±0.10	1027.70±11.45
	杜松Juniperus rigida	1.22±0.09	0.28±0.02	8.99±0.53	3.37±0.08	952.56±10.49
	油松Pinus tabuliformis	1.63±0.03	0.51±0.08	6.42±0.99	4.30±0.13	975.92±18.03
	小叶杨Populus simonii	7.80±0.31	2.09±0.10	75.71±7.49	2.50±0.23	1071.93±14.22
	侧柏Platycladus orientalis	1.68±0.04	0.24±0.01	8.16±0.18	2.61±0.16	954.55±24.90
灌木	红砂Reaumuria songarica	1.98±0.02	0.47±0.05	12.39±2.05	3.40±0.03	983.75±13.09
	毛刺锦鸡儿Caragana tibetica	2.25±0.05	0.40±0.02	10.50±1.13	3.84±0.12	1072.87±19.49
	叉子圆柏Juniperus sabina	4.02±0.05	0.79±0.03	45.77±8.44	1.57±0.07	1044.28±11.47
	柽柳Tamarix chinensis	5.39±0.07	1.08±0.07	66.84±8.64	1.52±0.08	1092.53±9.550
	珍珠梅Sorbaria sorbifolia	3.92±0.11	0.99±0.07	25.82±0.96	3.88±0.06	1093.63±15.10

生活型	指标	P_n	T_r	G_s	V_PD	T_a	T_l	CO₂	H_in	P_AR
乔木	P_n	1
	T_r	0.941^**	1
	G_s	0.923^*	0.987^**	1
	V_PD	-0.497	-0.471	-0.589	1
	T_a	-0.783^*	-0.825^*	-0.836^*	0.465	1
	T_l	-0.612	-0.728	-0.776^*	0.667	0.885^**	1
	CO₂	-0.179	-0.338	-0.424	0.254	0.335	0.309	1
	H_in	0.648	0.424	0.443	-0.637	-0.491	-0.419	0.335	1
	P_AR	0.910^**	0.738	0.695	-0.296	-0.563	-0.288	-0.010	0.674	1
灌木	P_n	1
	T_r	0.943^*	1
	G_s	0.946^*	0.812	1
	V_PD	-0.715	-0.551	-0.893^*	1
	T_a	-0.148	-0.048	0.302	0.618	1
	T_l	-0.801	-0.774	-0.754	0.694	0.625	1
	CO₂	0.272	0.432	-0.023	0.29	0.072	-0.453	1
	H_in	0.991^*	0.977^**	0.912^*	-0.651	-0.099	-0.786	0.309	1
	P_AR	0.651	0.629	0.441	-0.081	0.358	-0.406	0.666	0.636	1

生活型	树种	日净同化量/ [mmol/(m²·s)]	单位叶面积固碳量/ [g/(m²·d)]	单位叶面积释氧量/ [g/(m²·d)]
乔木	榆Ulmus pumila	331.54±3.13	11.67±0.06	8.48±0.08
	樟子松Pinus sylvestris var. mongholica Litv.	156.92±6.21	5.52±0.13	4.01±0.15
	云杉Picea asperata	87.26±1.27	3.07±0.03	2.23±0.03
	杜松Juniperus rigida	41.93±3.70	1.48±0.08	1.07±0.09
	油松Pinus tabuliformis	60.61±2.90	2.13±0.06	1.55±0.07
	小叶杨Populus simonii	287.04±24.43	10.10±0.50	7.34±0.62
	侧柏Platycladus orientalis	62.53±3.42	2.20±0.07	1.6±0.08
灌木	红砂Reaumuria songarica	73.27±0.48	2.58±0.01	1.87±0.01
	毛刺锦鸡儿Caragana tibetica	84.05±6.34	2.96±0.13	2.15±0.16
	叉子圆柏Juniperus sabina	148.85±3.62	5.24±0.07	3.81±0.09
	柽柳Tamarix chinensis	205.55±3.45	7.24±0.07	5.26±0.08
	珍珠梅Sorbaria sorbifolia	146.96±8.27	5.17±0.17	3.76±0.21