Increasing drought sensitivity of plant photosynthetic phenology and physiology

作者：Yiheng Wang, Dashuan Tian, Jingfeng Xiao, Xing Li, Shuli Niu · 发表于：Ecological Indicators · 年份：2024 · DOI：10.1016/j.ecolind.2024.112469 · 被引用次数：21 · 研究领域：Plant Water Relations and Carbon Dynamics、Hydrology and Drought Analysis、Tree-ring climate responses

• Plant photosynthetic phenology and physiology respond divergently to different seasons’ drought. • The sensitivity of SOS, EOS, and GPPmax to droughts exhibited notable increases over the last two decades. • The ESM accurately projected the drought sensitivities of SOS and EOS but overestimated that of GPPmax. • The increases in drought sensitivities of SOS and EOS are projected to intensify in the 21st century. Understanding the impacts of drought on plant photosynthetic phenology and physiology is essential for accurately predicting annual gross primary productivity (GPP) and global carbon cycles. While droughts in different seasons can have different effects on plant growth and photosynthesis, a comprehensive understanding of how plant photosynthetic phenology and physiology respond to different seasons’ droughts and their temporal changes is lacking. Here, we comprehensively evaluated the drought sensitivities of plant photosynthetic phenology and physiology and their temporal trends in the past two decades, using the start/end of the photosynthetic seasons (SOS/EOS) and peak GPP (GPPmax) derived from FLUXNET ground observations since the 1990s and remote-sensing data (2001–2020) over the globe. Our results show that spring droughts leads to delayed SOS in arid ecosystems and advanced SOS in humid ecosystems. In contrast, droughts in summer and autumn generally advance EOS. In addition, spring droughts decrease GPPmax in arid regions but increase it in humid regions, wh...