气候变化领域集成服务门户(CCPortal): Vegetation canopy structure mediates the response of gross primary production to environmental drivers across multiple temporal scales

CCPortal

DOI	10.1016/j.scitotenv.2024.170439
	Vegetation canopy structure mediates the response of gross primary production to environmental drivers across multiple temporal scales
	Zheng, Yaoyao; Zhao, Weiqing; Chen, Anping; Chen, Yue; Chen, Jiana; Zhu, Zaichun
发表日期	2024
ISSN	0048-9697
EISSN	1879-1026
起始页码	917
卷号	917
英文摘要	Gross primary production (GPP) is a critical component of the global carbon cycle and plays a significant role in the terrestrial carbon budget. The impact of environmental factors on GPP can occur through both direct (by influencing photosynthetic efficiency) and indirect (through the modulation of vegetation structure) pathways, but the extent to which these mechanisms contribute has been seldom quantified. In this study, we used structural equation modeling and observations from the FLUXNET network to investigate the direct and indirect effects of environmental factors on terrestrial ecosystem GPP at multiple temporal scales. We found that canopy structure, represented by leaf area index (LAI), is a crucial intermediate factor in the GPP response to environmental drivers. Environmental factors affect GPP indirectly by altering canopy structure, and the relative proportion of indirect effects decreased with increasing LAI. The study also identified different effects of environmental factors on GPP across time scales. At the half-hourly time scale, radiation was the primary driver of GPP. In contrast, the influences of temperature and vapor pressure deficit took on greater prominence at longer time scales. About half of the total effect of temperature on GPP was indirect through the regulation of canopy structure, and the indirect effect increased with increasing time scale (GPPNT-based models: 0.135 (half-hourly) vs. 0.171 (daily) vs. 0.189 (weekly) vs. 0.217 (monthly); GPPDT-based models: 0.139 vs. 0.170 vs. 0.187 vs.
英文关键词	Driving factors; Gross primary production; Leaf area index; Multiple temporal scales; Structural equation model; Vegetation canopy structure
语种	英语
WOS研究方向	Environmental Sciences & Ecology
WOS类目	Environmental Sciences
WOS记录号	WOS:001174628200001
来源期刊	SCIENCE OF THE TOTAL ENVIRONMENT
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/299516
作者单位	Peking University; Peking University; Ministry of Natural Resources of the People's Republic of China; Colorado State University
推荐引用方式 GB/T 7714	Zheng, Yaoyao,Zhao, Weiqing,Chen, Anping,et al. Vegetation canopy structure mediates the response of gross primary production to environmental drivers across multiple temporal scales[J],2024,917.
APA	Zheng, Yaoyao,Zhao, Weiqing,Chen, Anping,Chen, Yue,Chen, Jiana,&Zhu, Zaichun.(2024).Vegetation canopy structure mediates the response of gross primary production to environmental drivers across multiple temporal scales.SCIENCE OF THE TOTAL ENVIRONMENT,917.
MLA	Zheng, Yaoyao,et al."Vegetation canopy structure mediates the response of gross primary production to environmental drivers across multiple temporal scales".SCIENCE OF THE TOTAL ENVIRONMENT 917(2024).