Ecosystem Carbon Fluxes Exhibit Thermal Response Thresholds at Which Carbon–Climate Feedback Changes

IF 6.3 1区环境科学与生态学 Q1 ECOLOGY

Global Ecology and Biogeography Pub Date : 2025-04-01 DOI:10.1111/geb.70030

Xiaoni Xu, Jianjun Xu, Bo Li, Jinquan Li, Ming Nie

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引用次数: 0

Abstract

Aim

The carbon–climate feedback of terrestrial ecosystems plays a key role in determining atmospheric carbon dioxide concentrations. Ecosystem respiration (ER) has been demonstrated to be more sensitive than gross primary productivity (GPP) to increasing temperature, leading to positive carbon–climate feedback. However, the direction and magnitude of the feedback are unclear across diverse thermal regimes. The objective of this study was to assess the variability in the carbon–climate feedback with thermal regimes.

Location

Global.

Time Period

1991–2014.

Major Taxa Studied

Terrestrial ecosystems.

Methods

We used linear and piecewise-linear mixed-effects models, quantified based on the Arrhenius function, to find the models that best characterise the temperature dependence of net ecosystem exchange (NEE), GPP and ER at global and climate scales.

Results

By analysing global data from 184 FLUXNET sites, we show that the temperature dependence of terrestrial carbon flux changes at two temperature threshold zones: −5.4°C to −1.7°C and 17.0°C to 17.1°C. The carbon–climate feedback is positive at cold and warm temperatures but negative at intermediate temperatures. This general pattern was observed in all but one of the five climatic zones.

Main Conclusions

Climate warming may not simply reduce the carbon uptake potential of terrestrial ecosystems, but the effects are dependent on ambient temperatures. Our findings highlight that temperature thresholds should be adequately considered for a more realistic presentation of carbon–climate feedback under future climate change.

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生态系统碳通量表现出碳-气候反馈变化的热响应阈值

目的陆地生态系统的碳-气候反馈在确定大气二氧化碳浓度中起关键作用。生态系统呼吸（ER）比总初级生产力（GPP）对温度升高更为敏感，导致碳-气候正反馈。然而，反馈的方向和大小在不同的热状态下是不清楚的。本研究的目的是评估碳-气候反馈随热状态的变化。位置全球。时间：1991-2014。主要分类群研究陆地生态系统。方法采用基于Arrhenius函数量化的线性和分段线性混合效应模型，寻找最能表征净生态系统交换（NEE）、GPP和ER在全球尺度和气候尺度上的温度依赖性的模型。结果通过分析184个FLUXNET站点的全球数据，我们发现陆地碳通量的温度依赖性在两个温度阈值区：−5.4°C至−1.7°C和17.0°C至17.1°C。碳-气候反馈在寒冷和温暖温度下为正，而在中等温度下为负。在五个气候带中，除一个气候带外，其他所有气候带都出现了这种普遍模式。气候变暖可能不是简单地降低陆地生态系统的碳吸收潜力，但这种影响依赖于环境温度。我们的研究结果强调，在未来气候变化下，温度阈值应该被充分考虑，以更现实地呈现碳-气候反馈。

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.