Global synthesis of temperature sensitivity of soil organic carbon decomposition: Latitudinal patterns and mechanisms

Global synthesis of temperature sensitivity of soil organic carbon decomposition: Latitudinal patterns and mechanisms
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土壤有机碳分解温度敏感性的全球综合:纬度模式和机制

DOI:
10.1111/1365-2435.13256
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发表时间:
2019-01
期刊:
影响因子:
5.2
通讯作者:
Zhang Weidong
Zhang Weidong
中科院分区:
环境科学与生态学1区
文献类型:
--
作者:
Wang Qingkui;Zhao Xuechao;Chen Longchi;Yang Qingpeng;Chen Shi;Zhang Weidong

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1. The response of soil organic carbon (SOC) decomposition to global warming is a potentially major source of uncertainty in climate prediction. However, the magni tude and direction of SOC cycle feedbacks under climate warming remain uncer-tain because of the knowledge gap about the global-scale spatial pattern and temperature sensitivity ( Q 10 ) mechanism of SOC decomposition. 2. Here, we collected data of Q 10 and corresponding soil variables from 81 peer-re viewed papers using laboratory incubation to explore how Q 10 varied among different ecosystems at the global scale and whether labile and recalcitrant SOC pools had equal Q 10 values. 3. Q 10 with a global average of 2.41 substantially varied among different ecosystems, C:N ratio and microbes Thiessen, Reichstein, These studies have ad vanced our understanding of Q 10 and its potential controlling fac tors. However, a constant value of Q 10 is commonly used in several climate–carbon cycle models, hence leading to high uncertainty in the projection of feedback between terrestrial ecosystem C cycle and climate change. Furthermore, no comprehensive evaluation of the spatial variations of Q 10 with geographic variables at the global scale has been performed to date, resulting in a ity mechanisms 10 , although a few studies investigated the spatial variations in 10 continental Understanding the mechanisms governing the Q 10 of SOC decomposition is critical for predicting future atmo spheric CO 2 and improving accuracy of predictions. the fundamental drivers and basic patterns of
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