Growth Onset Rather Than Photosynthesis Strongly Regulates Autumn Senescence Termination Besides Climate Change

IF 6.3 1区环境科学与生态学 Q1 ECOLOGY

Global Ecology and Biogeography Pub Date : 2025-05-26 DOI:10.1111/geb.70068

Shuping Ji, Shilong Ren, Yann Vitasse, Constantin M. Zohner, Yongshuo H. Fu, Xiaoqiu Chen, Xiaoyang Zhang, Charlotte Grossiord, Huiying Liu, Matthias Peichl, Dailiang Peng, Shuai An, Yating Li, Maihe Li, Lei Fang, Jinyue Chen, Xinfeng Wang, Qingzhu Zhang, Guoqiang Wang, Qiao Wang

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引用次数: 0

Abstract

Aim

Plant senescence largely influences the global carbon cycle by regulating the growing season length. However, the driving mechanisms of plant senescence remain unclear, particularly the role of developmental factors. This study aims to investigate how environmental and developmental factors drive autumn senescence and evaluate whether woody and herbaceous plants exhibit divergent responses to these drivers.

Location

Eurasia.

Time Period

1982–2014.

Major Taxa Studied

Woody and herbaceous species.

Methods

Using 120,833 long-term ground phenological observations, we employed partial correlation analysis to investigate the influence of environmental and developmental factors on senescence termination. Experimental records from literature and pasture survey observations from China were separately utilised to further validate the influence of developmental factors on senescence termination. Structural equation modelling was applied to analyse the pathways of growth onset affecting senescence termination. Additionally, multiple linear regression was used to examine the tendency of the sensitivity of senescence termination to plant development rate.

Results

We find that earlier growth onset primarily leads to earlier senescence termination directly in herbaceous plants, but indirectly in woody plants by accelerating early-season development. The sensitivity of senescence termination to plant development rate shows a declining trend, particularly in early-season negative effects on woody plants and late-season positive effects on herbaceous plants, suggesting diminished impacts of future warming on senescence timing. The impact of growing season photosynthetic activity on senescence termination is not pronounced for both woody and herbaceous plants.

Main Conclusions

The results demonstrate that growth onset may affect woody and herbaceous senescence termination through different pathways, whereas the carry-over effects of growing season photosynthetic activity are not widely discovered. This emphasises that the introduction of developmental factors into phenological models needs to be considered carefully according to plant type.

查看原文本刊更多论文

除气候变化外，生长启动对秋季衰老终止的影响大于光合作用

目的植物衰老主要通过调节生长季节长度来影响全球碳循环。然而，植物衰老的驱动机制仍不清楚，特别是发育因素的作用。本研究旨在探讨环境和发育因素如何驱动秋季衰老，并评估木本植物和草本植物对这些驱动因素是否表现出不同的反应。位置欧亚大陆。时间：1982-2014。主要分类群研究了木本和草本种。方法利用120,833份长期地面物候观测资料，采用偏相关分析方法研究环境和发育因素对衰老终止的影响。利用文献中的实验记录和中国的牧场调查观察，进一步验证发育因素对衰老终止的影响。采用结构方程模型分析了生长开始影响衰老终止的途径。此外，利用多元线性回归分析了植株衰老终止敏感性随植株发育速率的变化趋势。结果在草本植物中，较早的生长开始主要直接导致较早的衰老终止，而在木本植物中则通过加速早季发育间接导致较早的衰老终止。衰老终止对植物发育速率的敏感性呈下降趋势，特别是对木本植物的季前负影响和对草本植物的季后正影响，表明未来变暖对衰老时间的影响减弱。在木本植物和草本植物中，生长季节光合活性对衰老终止的影响并不明显。结果表明，生长开始可能通过不同的途径影响木本植物和草本植物的衰老终止，而生长季节光合活性的结转效应尚未被广泛发现。这强调了在物候模型中引入发育因子需要根据植物类型仔细考虑。

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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.