首页|Climate and litter C/N ratio constrain soil organic carbon accumulation

Climate and litter C/N ratio constrain soil organic carbon accumulation

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Soil organic carbon (SOC) plays critical roles in stabilizing atmospheric CO2 concentration, but the mechanistic controls on the amount and distribution of SOC on global scales are not well understood. In turn, this has hampered the ability to model global C budgets and to find measures to mitigate climate change. Here, based on the data from a large field survey campaign with 2600 plots across China's forest ecosystems and a global collection of published data from forested land, we find that a low litter carbon-to-nitrogen ratio (C/N) and high wetness index (P/PET, precipitation-to-potential- evapotranspiration ratio) are the two factors that promote SOC accumulation, with only minor contributions of litter quantity and soil texture. The field survey data demonstrated that high plant diversity decreased litter C/N and thus indirectly promoted SOC accumulation by increasing the litter quality. We conclude that any changes in plant-community composition, plant-species richness and environmental factors that can reduce the litter C/N ratio, or climatic changes that increase wetness index, may promote SOC accumulation. The study provides a guideline for modeling the carbon cycle of various ecosystem scales and formulates the principle for land-based actions for mitigating the rising atmospheric CO2 concentration.

litter carbon-to-nitrogenwetness indexannual litterfallsoil texturesoil organic carbon

Guoyi Zhou、Shan Xu、Philippe Ciais、Stefano Manzoni、Jingyun Fang、Guirui Yu、Xuli Tang、Ping Zhou、Wantong Wang、Junhua Yan、Gengxu Wang、Keping Ma、Shenggong Li、Sheng Du、Shijie Han、Youxin Ma、Deqiang Zhang、Juxiu Liu、Shizhong Liu、Guowei Chu、Qianmei Zhang、Yuelin Li、Wenjuan Huang、Hai Ren、Xiankai Lu、Xiuzhi Chen

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South China Institute of Botany, Chinese Academy of Sciences, Guangzhou 510650, China

Institute of Ecology, Jiangsu Key Laboratory of Agricultural Meteorology, Nanjing University of Information Science & Technology, Nanjing 210044, China

Institut Pierre Simon Laplace, Laboratoire des Sciences du Climat et de l'Environnement, CEA CNRS UVSQ UPSaclay, 91191 Gif sur Yvette, France

Department of Physical Geography, Stockholm University, Stockholm SE-10691, Sweden

Bolin Centre for Climate Research, Stockholm SE-10691, Sweden

Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China

Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China

Guangzhou Institute of Geography, Guangdong Academy of Sciences, Guangzhou 510070, China

College of Tourism, Henan Normal University, Xinxiang 453007, China

Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu 610041, China

Institute of Soil and Water Conservation, Chinese Academy of Sciences, Yangling 712100, China

Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China

Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Mengla 666303, China

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This work was supported by the Strategic Priority Re-search Program of the Chinese Academy of Sciences(CAS)National Natural Science Foundation of ChinaCAS Distinguished Research Fellow Program and the Swedish Research Councils,FormasCAS Distinguished Research Fellow Program and the Swedish Research Councils,Formas

XDA05050000NSFC414305292015-468VR2016-04146

2019

10.1093/nsr/nwz045

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ISSN：
年,卷(期)：2019.6(4)
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