干旱区生态环境知识资源中心(Arid): Drought limits vegetation carbon sequestration by affecting photosynthetic capacity of semi-arid ecosystems on the Loess Plateau

Arid

DOI	10.1016/j.scitotenv.2023.168778
	Drought limits vegetation carbon sequestration by affecting photosynthetic capacity of semi-arid ecosystems on the Loess Plateau
	Li, Dou; Li, Xiaoxia; Li, Zongshan; Fu, Yang; Zhang, Jingtian; Zhao, Yijin; Wang, Yafeng; Liang, Eryuan; Rossi, Sergio
通讯作者	Li, XX
来源期刊	SCIENCE OF THE TOTAL ENVIRONMENT
ISSN	0048-9697
EISSN	1879-1026
出版年	2024
卷号	912
英文摘要	Drought is the driver for ecosystem production in semi-arid areas. However, the response mechanism of ecosystem productivity to drought remains largely unknown. In particular, it is still unclear whether drought limits the production via photosynthetic capacity or phenological process. Herein, we assess the effects of maximum seasonal photosynthesis, growing season length, and climate on the annual gross primary productivity (GPP) in vegetation areas of the Loess Plateau using multi-source remote sensing and climate data from 2001 to 2021. We found that maximum seasonal photosynthesis rather than growing season length dominates annual GPP, with above 90 % of the study area showing significant and positive correlation. GPP and maximum seasonal photosynthesis were positively correlated with self-calibrating Palmer Drought Severity Index (scPDSI), stan-dardized precipitation and evapotranspiration index (SPEI) in >95 % of the study area. Structural equation model demonstrated that both drought indices contributed to the annual GPP by promoting the maximum seasonal photosynthesis. Total annual precipitation had a positive and significant effect on two drought indices, whereas the effects of temperature and radiation were not significant. Evidence from wood formation data also confirmed that low precipitation inhibited long-term carbon sequestration by decreasing the maximum growth rate in forests. Our findings suggest that drought limits ecosystem carbon sequestration by inhibiting vegetation photosynthetic capacity rather than phenology, providing a support for assessing the future dynamics of the terrestrial carbon cycle and guiding landscape management in semi-arid ecosystems.
英文关键词	Drought Gross primary productivity Ecosystem carbon uptake Wood formation Growth rate Phenology
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:001128220400001
WOS关键词	GROSS PRIMARY PRODUCTIVITY ; INTERANNUAL VARIABILITY ; PLANT PHENOLOGY ; CLIMATE-CHANGE ; TIME-SERIES ; PRECIPITATION ; TEMPERATURE ; XYLOGENESIS ; CHINA ; REDUCTION
WOS类目	Environmental Sciences
WOS研究方向	Environmental Sciences & Ecology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/405445
推荐引用方式 GB/T 7714	Li, Dou,Li, Xiaoxia,Li, Zongshan,et al. Drought limits vegetation carbon sequestration by affecting photosynthetic capacity of semi-arid ecosystems on the Loess Plateau[J],2024,912.
APA	Li, Dou.,Li, Xiaoxia.,Li, Zongshan.,Fu, Yang.,Zhang, Jingtian.,...&Rossi, Sergio.(2024).Drought limits vegetation carbon sequestration by affecting photosynthetic capacity of semi-arid ecosystems on the Loess Plateau.SCIENCE OF THE TOTAL ENVIRONMENT,912.
MLA	Li, Dou,et al."Drought limits vegetation carbon sequestration by affecting photosynthetic capacity of semi-arid ecosystems on the Loess Plateau".SCIENCE OF THE TOTAL ENVIRONMENT 912(2024).