Lateral transport of soil carbon and land-atmosphere CO2 flux induced by water erosion in China

Yue Yao; Ni Jinren; Ciais PhilippePiao ShilongWang TaoHuang MengtianBorthwick Alistair G. L.Li TianhongWang YichuChappell AdrianVan Oost Kristof

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Lateral transport of soil carbon and land-atmosphere CO2 flux induced by water erosion in China

机译：Lateral transport of soil carbon and land-atmosphere CO2 flux induced by water erosion in China

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Soil erosion by water impacts soil organic carbon stocks and alters CO2 fluxes exchanged with the atmosphere. The role of erosion as a net sink or source of atmospheric CO2 remains highly debated, and little information is available at scales larger than small catchments or regions. This study attempts to quantify the lateral transport of soil carbon and consequent land-atmosphere CO2 fluxes at the scale of China, where severe erosion has occurred for several decades. Based on the distribution of soil erosion rates derived from detailed national surveys and soil carbon inventories, here we show that water erosion in China displaced 180 +/- 80 Mt C.y(-1) of soil organic carbon during the last two decades, and this resulted a net land sink for atmospheric CO2 of 45 +/- 25 Mt C.y(-1), equivalent to 8-37 of the terrestrial carbon sink previously assessed in China. Interestingly, the "hotspots," largely distributed in mountainous regions in the most intensive sink areas (>40 g C.m(-2).y(-1)), occupy only 1.5 of the total area suffering water erosion, but contribute 19.3 to the national erosion-induced CO2 sink. The erosion-induced CO2 sink underwent a remarkable reduction of about 16 from the middle 1990s to the early 2010s, due to diminishing erosion after the implementation of large-scale soil conservation programs. These findings demonstrate the necessity of including erosion-induced CO2 in the terrestrial budget, hence reducing the level of uncertainty.

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《Proceedings of the National Academy of Sciences of the United States of America.》 |2016年第24期|6617-6622|共6页
作者
Yue Yao; Ni Jinren; Ciais PhilippePiao ShilongWang TaoHuang MengtianBorthwick Alistair G. L.Li TianhongWang YichuChappell AdrianVan Oost Kristof;
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作者单位

Peking Univ, Coll Environm Sci & Engn, The Key Lab Water & Sediment Sci, Minist Educ, Beijing 100871, Peoples R China;

Univ Versailles St Quentin En Yvelines, Commissariat Energie Atom & Energies Alternat, Inst Pierre Simon Laplace, Lab Sci Climat & Envirom,CNRS, F-91191 Gif Sur Yvette, France;

Peking Univ, Dept Ecol, Beijing 100871, Peoples R ChinaChinese Acad Sci, Inst Tibetan Plateau Res, Key Lab Alpine Ecol & Biodivers, Beijing 100101, Peoples R ChinaUniv Edinburgh, Sch Engn, Edinburgh EH9 3JL, Midlothian, ScotlandCSIRO, Land & Water, Canberra, ACT 2601, AustraliaCatholic Univ Louvain, Earth & Life Inst, Georges Lemaitre Ctr Earth & Climate Res, B-1348 Louvain, Belgium;

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收录信息美国《科学引文索引》(SCI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
原文格式 PDF
正文语种英语
中图分类自然科学总论;
关键词
land-atmosphere CO2 flux; soil carbon displacement; water erosion; national scale;

Lateral transport of soil carbon and land-atmosphere CO2 flux induced by water erosion in China

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