气候变化领域集成服务门户(CCPortal): Lateral transport of soil carbon and land-atmosphere CO2 flux induced by water erosion in China

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DOI	10.1073/pnas.1523358113
	Lateral transport of soil carbon and land-atmosphere CO2 flux induced by water erosion in China
	Yue, Yao; Ni, Jinren; Ciais, Philippe; Piao, Shilong; Wang, Tao; Huang, Mengtian; Borthwick, Alistair G. L.; Li, Tianhong; Wang, Yichu; Chappell, Adrian; Van Oost, Kristof
通讯作者	Ni, JR (通讯作者)
发表日期	2016
ISSN	0027-8424
起始页码	6617
结束页码	6622
卷号	113 期号:24
英文摘要	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.
关键词	DISSOLVED ORGANIC-CARBON TERRESTRIAL ECOSYSTEMS DEPOSITION IMPACT STORAGE BASIN REDISTRIBUTION CROPLANDS SEDIMENT DYNAMICS
英文关键词	land-atmosphere CO2 flux; soil carbon displacement; water erosion; national scale
语种	英语
WOS研究方向	Science & Technology - Other Topics
WOS类目	Multidisciplinary Sciences
WOS记录号	WOS:000377948800032
来源期刊	PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/258871
推荐引用方式 GB/T 7714	Yue, Yao,Ni, Jinren,Ciais, Philippe,et al. Lateral transport of soil carbon and land-atmosphere CO2 flux induced by water erosion in China[J]. 中国科学院青藏高原研究所,2016,113(24).
APA	Yue, Yao.,Ni, Jinren.,Ciais, Philippe.,Piao, Shilong.,Wang, Tao.,...&Van Oost, Kristof.(2016).Lateral transport of soil carbon and land-atmosphere CO2 flux induced by water erosion in China.PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA,113(24).
MLA	Yue, Yao,et al."Lateral transport of soil carbon and land-atmosphere CO2 flux induced by water erosion in China".PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA 113.24(2016).