Seasonal and interannual variations of ecosystem photosynthetic characteristics in a semi-arid grassland of Northern China

doi:10.1093/jpe/rtac065

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	Seasonal and interannual variations of ecosystem photosynthetic characteristics in a semi-arid grassland of Northern China
	You, Cuihai 2; Wang, Yanbing 2; Tan, Xingru 2; Zhang, Bingwei 3; Ren, Tingting ; Chen, Boyu 2; Xu, Mengzhen 2; Chen, Shiping 2
刊名	JOURNAL OF PLANT ECOLOGY
	2022
卷号	15 期号:5 页码:961-976
关键词	photosynthetic parameter water-limited grasslands eddy covariance carbon flux physiological regulation
ISSN号	1752-9921
DOI	10.1093/jpe/rtac065
文献子类	Article
英文摘要	The ecosystem apparent quantum yield (alpha), maximum rate of gross CO2 assimilation (P-max) and daytime ecosystem respiration rate (R-d), reflecting the physiological functioning of ecosystem, are vital photosynthetic parameters for the estimation of ecosystem carbon budget. Climatic drivers may affect photosynthetic parameters both directly and indirectly by altering the response of vegetation. However, the relative contribution and regulation pathway of environmental and physiological controls remain unclear, especially in semi-arid grasslands. We analyzed seasonal and interannual variations of photosynthetic parameters derived from eddy-covariance observation in a typical semi-arid grassland in Inner Mongolia, Northern China, over 12 years from 2006 to 2017. Regression analyses and a structural equation model (SEM) were adopted to separate the contributions of environmental and physiological effects. The photosynthetic parameters showed unimodal seasonal patterns and significantly interannual variations. Variations of air temperature (T-a) and soil water content (SWC) drove the seasonal patterns of photosynthetic parameters, while SWC predominated their interannual variations. Moreover, contrasting with the predominant roles of T-a on alpha and R-d, SWC explained more variance of P-max than T-a. Results of SEM revealed that environmental factors impacted photosynthetic parameters both directly and indirectly through regulating physiological responses reflected by stomatal conductance at the canopy level. Moreover, leaf area index (LAI) directly affected alpha, P-max and R-d and dominated the variation of P-max. On the other hand, SWC influenced photosynthetic parameters indirectly through LAI and canopy surface conductance (gc). Our findings highlight the importance of physiological regulation on the photosynthetic parameters and carbon assimilation capacity, especially in water-limited grassland ecosystems.
学科主题	Plant Sciences ; Ecology ; Forestry
电子版国际标准刊号	1752-993X
出版地	OXFORD
WOS关键词	CARBON-DIOXIDE EXCHANGE ; LIGHT-RESPONSE ; INNER-MONGOLIA ; BIOPHYSICAL REGULATIONS ; STOMATAL CONDUCTANCE ; PRIMARY PRODUCTIVITY ; ENERGY-BALANCE ; CO2 EXCHANGE ; NET ; VARIABILITY
WOS研究方向	Science Citation Index Expanded (SCI-EXPANDED)
语种	英语
出版者	OXFORD UNIV PRESS
WOS记录号	WOS:000860845700003
资助机构	National Key Research and Development Program of China [2017YFA0604801] ; National Natural Science Foundation of China [32071565, 41773084]
内容类型	期刊论文
源URL	[http://ir.ibcas.ac.cn/handle/2S10CLM1/28696]
专题	植被与环境变化国家重点实验室
作者单位	1.Beijing Normal Univ, Adv Inst Nat Sci, State Key Lab Earth Surface Proc & Resource Ecol, Zhuhai Branch, Zhuhai 519087, Peoples R China 2.Chinese Acad Sci, Inst Bot, State Key Lab Vegetat & Environm Change, Beijing 100093, Peoples R China 3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	You, Cuihai,Wang, Yanbing,Tan, Xingru,et al. Seasonal and interannual variations of ecosystem photosynthetic characteristics in a semi-arid grassland of Northern China[J]. JOURNAL OF PLANT ECOLOGY,2022,15(5):961-976.
APA	You, Cuihai.,Wang, Yanbing.,Tan, Xingru.,Zhang, Bingwei.,Ren, Tingting.,...&Chen, Shiping.(2022).Seasonal and interannual variations of ecosystem photosynthetic characteristics in a semi-arid grassland of Northern China.JOURNAL OF PLANT ECOLOGY,15(5),961-976.
MLA	You, Cuihai,et al."Seasonal and interannual variations of ecosystem photosynthetic characteristics in a semi-arid grassland of Northern China".JOURNAL OF PLANT ECOLOGY 15.5(2022):961-976.