Rising Atmospheric CO2 Alleviates Drought Impact on Autumn Leaf Senescence Over Northern Mid-High Latitudes

IF 6.3 1区环境科学与生态学 Q1 ECOLOGY Global Ecology and Biogeography Pub Date : 2025-01-06 DOI:10.1111/geb.13954

Peng Li, Mai Sun, Jingfeng Xiao, Yunpeng Luo, Yao Zhang, Xing Li, Xiaolu Zhou, Changhui Peng

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Abstract

Aim

Drought reduces plant growth and hastens the process of leaf senescence in autumn. Concurrently, increasing atmospheric CO₂ concentrations likely amplifies photosynthetic activity while increasing plant water-use efficiency. However, how drought affects the date of leaf senescence (DLS) and whether elevated CO₂ 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 regions but a negative trend in wet regions. We found these observed changes were primarily attributed to elevated CO₂, alleviating the drought stress on DLS in nearly 40% of the study area.

Main Conclusions

Our findings demonstrate the complex role that atmospheric CO₂ plays in regulating plant leaf senescence during drought stress, highlighting the need to incorporate the effects of elevated CO₂ on vegetation autumn phenology into land-surface models for projecting vegetation growth and carbon uptake under continued global change.

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大气CO2上升缓解干旱对北方中高纬度地区秋叶衰老的影响

在秋天，干旱减少了植物的生长，加速了叶片衰老的过程。同时，大气中二氧化碳浓度的增加可能会增强光合作用，同时提高植物的水分利用效率。然而，干旱如何影响叶片衰老（DLS）的日期以及升高的二氧化碳是否可以缓解这一问题仍然未知。本文探讨了近年来气候变化背景下干旱对DLS的影响及其机制。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Global Ecology and Biogeography 环境科学-生态学

CiteScore

12.10

自引率

3.10%

发文量

170

审稿时长

3 months

期刊介绍： Global Ecology and Biogeography (GEB) welcomes papers that investigate broad-scale (in space, time and/or taxonomy), general patterns in the organization of ecological systems and assemblages, and the processes that underlie them. In particular, GEB welcomes studies that use macroecological methods, comparative analyses, meta-analyses, reviews, spatial analyses and modelling to arrive at general, conceptual conclusions. Studies in GEB need not be global in spatial extent, but the conclusions and implications of the study must be relevant to ecologists and biogeographers globally, rather than being limited to local areas, or specific taxa. Similarly, GEB is not limited to spatial studies; we are equally interested in the general patterns of nature through time, among taxa (e.g., body sizes, dispersal abilities), through the course of evolution, etc. Further, GEB welcomes papers that investigate general impacts of human activities on ecological systems in accordance with the above criteria.