Soil moisture dominates the interannual variability in alpine ecosystem productivity by regulating maximum photosynthetic capacity across the Qinghai-Tibetan Plateau

被引：8

作者：

Zhang, Tao ^{[1
]}

Tang, Yuanyuan ^{[1
]}

Xu, Mingjie ^{[1
]}

Zhao, Guang ^{[2
]}

Cong, Nan ^{[2
]}

Zheng, Zhoutao ^{[2
]}

Zhu, Juntao ^{[2
]}

Niu, Ben ^{[2
]}

Chen, Zhi ^{[2
]}

Zhang, Yangjian ^{[2
,3
,4
]}

Chen, Ning ^{[5
]}

He, Yongtao ^{[2
,4
]}

Yu, Guirui ^{[2
,4
]}

机构：

[1] Shenyang Agr Univ, Coll Agron, Shenyang 110866, Peoples R China

[2] Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Ecosyst Network Observat & Modeling, Beijing 100101, Peoples R China

[3] Chinese Acad Sci, Ctr Excellence Tibetan Plateau Earth Sci, Beijing 100101, Peoples R China

[4] Univ Chinese Acad Sci, Coll Resources & Environm, Beijing 100190, Peoples R China

[5] Chinese Acad Sci, Northeast Inst Geog & Agroecol, Key Lab Wetland Ecol & Environm, Changchun 130102, Peoples R China

来源：

GLOBAL AND PLANETARY CHANGE | 2023年 / 228卷

基金：

中国国家自然科学基金; 中国博士后科学基金;

关键词：

Climate change; Phenology; Physiology; Carbon flux; Grassland; GROSS PRIMARY PRODUCTIVITY; DELAYED SPRING PHENOLOGY; NET CARBON UPTAKE; CLIMATE-CHANGE; GRASSLAND ECOSYSTEMS; AUTUMN PHENOLOGY; PLANT PHENOLOGY; IMPACTS; FLUXES; TEMPERATE;

D O I：

10.1016/j.gloplacha.2023.104191

中图分类号：

P9 [自然地理学];

学科分类号：

0705 ; 070501 ;

摘要：

The alpine ecosystems on the Qinghai-Tibetan Plateau are quite sensitive to climate change. The increasing temperature and changing precipitation patterns greatly affect the gross primary productivity (GPP) and disturb the carbon balances of these alpine ecosystems. To clarify the impacts of future climate change across the Qinghai-Tibetan Plateau, it is important to address the scientific issue "Which factor would dominate interannual variability (IAV) in GPP and through which path does it work?" To clarify this issue, two key processes, growing season length (GSL) and maximum photosynthetic capacity (GPPmax), were introduced to reveal the underlying mechanisms, and which of the environmental factors dominated their variations were studied specifically based on the flux and corresponding environmental observation data obtained in different types of alpine ecosystems across the Qinghai-Tibetan Plateau in this study. The results indicated that across the temperature- and waterlimited alpine ecosystems, the temperature controlled the GSL, but the water conditions dominated the variations in GPPmax. The soil water content (SWC) dominated GPPmax, which could explain 89% of the variation in GPPmax. The GSL alone was incapable of explaining IAV in GPP. Conversely, GPPmax is robust in explaining IAV in GPP, which could explain 94% of the annual GPP. Therefore, climate change would probably drive IAV in GPP through the path of "SWC -* GPPmax -* annual GPP" on the Qinghai-Tibetan Plateau. In addition, GPPmax together with GSL (GSL x GPPmax) could explain 99% of IAV in GPP, as they indicated the length of the carbon uptake time and the capacity of carbon sequestration, respectively. This study provides a new perspective on the predominant causes of IAV in GPP in alpine ecosystems, indicating that the changing precipitation patterns under future climate change will play a dominant role in affecting the carbon sink function of the Qinghai-Tibetan Plateau.

引用

页数：10