Pedosphere 23(6): 717--728, 2013
ISSN 1002-0160/CN 32-1315/P
©2013 Soil Science Society of China
Published by Elsevier B.V. and Science Press
| Contrasting effects of agricultural management on soil organic carbon balance in different agricultural regions of China |
WANG Guo-Cheng1, LUO Zhong-Kui2, WANG En-Li2 and HUANG Yao3 |
1State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry, Institution of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100083 (China)
2CSIRO Land & Water, Black Mountain, Canberra ACT 2601 (Australia)
3State Key Laboratory of Vegetation and Environmental Change, Institute of Botany, Chinese Academy of Sciences, Beijing 100093 (China) |
| ABSTRACT |
| Improving management of soil organic carbon (SOC) has been considered as a substantial mitigation strategy to climate change. Management such as stubble retention (SR), conservation tillage (ZT), and fertilization are recommended for both promoting production and accumulating SOC. However, whether such management practices can cause net increase in SOC or just a slow-down of SOC decline largely depends on the current status of SOC for a given region. This paper synthesized the available SOC data in the croplands of China, and analysed the change of SOC in the top 20 cm soil as a result of management change. The results showed that, on average, SOC increased by 18.3% through SR, by 9.1% through ZT, and by 12.4%, 36.9% and 41.5% through application of inorganic (IF), organic (OF) and combined inorganic and organic fertilizers (IOF), respectively, compared to those under stubble removal, conventional tillage and no fertilization. Under SR, ZT, IF, OF and IOF, SOC increased by 16.0%, 10.2%, 8.2%, 32.2% and 41.3%, respectively, at the end of the trials compared with the initial values at the start of the trials. Our analysis also showed that in Northeast and Northwest China, SOC in agricultural soils is still decreasing due to cultivation. In North and South China, however, SOC appears to have reached a new equilibrium of low SOC state after a long cultivation history, and soils have greater potential to sequester C. Our analysis highlights the need of taking account of the baseline status to assess the net soil C balance over time and space. |
| Key Words: agricultural practices, climate change, fertilization, residue management, tillage |
| Citation: Wang, G. C., Luo, Z. K., Wang, E. L. and Huang, Y. 2013. Contrasting effects of agricultural management on soil organic carbon balance in different agricultural regions of China. Pedosphere. 23(6): 717-728. |
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