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Inclusion of soil carbon lateral movement alters terrestrial carbon 
budget in China

 

Haicheng Zhang¹, Shuguang Liu², Wenping Yuan¹, Wenjie Dong¹, Aizhong Ye³, Xianhong Xie³, Yang Chen¹, Dan Liu¹, Wenwen Cai¹ & Yuna Mao³

 

1State Key Laboratory of Earth Surface Processes and Resource Ecology, Beijing Normal University, Beijing 100875, China,

2State Engineering Laboratory of Southern Forestry Applied Ecology and Technology, Central South University of Forestry and Technology, Changsha, Hunan 410004, China,

3College of Global Change and Earth System Science, Beijing Normal University, Beijing 100875, China.

 

ABSTRACT

The lateral movement of soil carbon has a profound effect on the carbon budget of terrestrial ecosystems; however, it has never been quantified in China, which is one of the strongest soil erosion areas in the world. In this study, we estimated that the overall soil erosion in China varies from 11.27 to 18.17 Pg yr−1 from 1982 to 2011, accounting for 7–21% of total soil erosion globally. Soil erosion induces a substantial lateral redistribution of soil organic carbon ranging from 0.64 to 1.04 Pg C yr⁻¹. The erosion-induced carbon flux ranges from a 0.19 Pg C yr⁻¹ carbon source to a 0.24 Pg C yr⁻¹ carbon sink in the terrestrial ecosystem, which is potentially comparable in magnitude to previously estimated total carbon budget of China (0.19 to 0.26 Pg yr⁻¹). Our results showed that the lateral movement of soil carbon strongly alters the carbon budget in China, and highlighted the urgent need to integrate the processes of soil erosion into the regional or global carbon cycle estimates.

 

KEY WORDS: Biogeochemistry, Climate change

 

PUBLISHED BY: SCIENTIFIC REPORTS, 2014, 4 10.1038

 

SOURCE:  http://www.nature.com/srep/2014/141128/srep07247/full/srep07247.html