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

doi:10.1073/pnas.1523358113

CORC > 北京大学 > 城市与环境学院

	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
刊名	PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
	2016
关键词	land-atmosphere CO2 flux soil carbon displacement water erosion national scale DISSOLVED ORGANIC-CARBON TERRESTRIAL ECOSYSTEMS DEPOSITION STORAGE IMPACT BASIN SEQUESTRATION LANDSCAPES CROPLANDS SEDIMENT
DOI	10.1073/pnas.1523358113
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.; National Natural Science Foundation of China [51379010]; Collaborative Innovation Center for Regional Environmental Quality; BELSPO-PAI [P7-24]; National General Survey Program on Soil and Water Conservation [SBZX-SBPC-1001]; SCI(E); PubMed; ARTICLE; nijinren@iee.pku.edu.cn; 24; 6617-6622; 113
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/433514]
专题	城市与环境学院环境科学与工程学院
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]. PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA,2016.
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.
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 (2016).