Rising Atmospheric CO 2 Alleviates Drought Impact on Autumn Leaf Senescence Over Northern Mid‐High Latitudes

作者：Peng Li, Mai Sun, Jingfeng Xiao, Yunpeng Luo, Yao Zhang, Xing Li, Xiaolu Zhou, Changhui Peng · 发表于：Global Ecology and Biogeography · 年份：2025 · DOI：10.1111/geb.13954 · 被引用次数：5 · 研究领域：Plant Water Relations and Carbon Dynamics、Plant responses to elevated CO2、Climate variability and models

ABSTRACT Aim Drought reduces plant growth and hastens the process of leaf senescence in autumn. Concurrently, increasing atmospheric CO 2 concentrations likely amplifies photosynthetic activity while increasing plant water‐use efficiency. However, how drought affects the date of leaf senescence (DLS) and whether elevated CO 2 can alleviate this remain unknown. Here, we explore the effect of drought on DLS under recent climate change and explore the underlying mechanisms. Location Northern mid‐high latitudes. Time Period 2000–2019. Major Taxa Studied Plants. Methods We conducted comprehensive analyses based on satellite remote sensing, eddy covariance flux observations, in situ phenology observations and land‐surface models. Linear regression analysis and a ten‐year moving window were adapted to investigate the spatiotemporal patterns in DLS sensitivity to drought ( S dd ). The partial least squares regression method was used to attribute the main factors for the variation in S dd , and land‐surface models in different scenarios were used to verify the robustness of the results. Results Our study presented divergent spatial patterns of S dd , where the highest S dd was concentrated in dry and warm regions. Temporally, multiple datasets consistently illustrate a significant decrease in the S dd during recent decades ( p < 0.05). We also observed a nonlinear relationship between the trend of S dd and aridity gradient, which presented a slightly positive S dd trend in dry regi...