Pedosphere 16(5): 660--667, 2006
ISSN 1002-0160/CN 32-1315/P
©2006 Soil Science Society of China
Published by Elsevier B.V. and Science Press
| Tillage effect on organic carbon in a purple paddy soil |
HUANG Xue-Xia1,2 , GAO Ming1, WEI Chao-Fu1, XIE De-Ti1 and PAN Gen-Xing3 |
1 College of Resources and Environment, Southwest Agricultural University, Chongqing 400716 (China). E-mail: huangxuexia2000@yahoo.com.cn
2 College of Environmental Science and Technology, Guangzhou University, Guangzhou 510006 (China)
3 College of Resources and Environment, Nanjing Agricultural University, Nanjing 210095 (China) |
| ABSTRACT |
| The distribution and storage of soil organic carbon (SOC) based on a long-term experiment with various tillage systems were studied in a paddy soil derived from purple soil in Chongqing, China. Organic carbon storage in the 0-20 and 0-40 cm soil layers under different tillage systems were in an order: ridge tillage with rice-rape rotation (RT-rr) > conventional tillage with rice only (CT-r) > ridge tillage with rice only (RT-r) > conventional tillage with rice-rape rotation (CT-rr). The RT-rr system had significantly higher levels of soil organic carbon in the 0-40 cm topsoil, while the proportion of the total remaining organic carbon in the total soil organic carbon in the 0-10 cm layer was greatest in the RT-rr system. This was the reason why the RT-rr system enhanced soil organic carbon storage. These showed that tillage system type was crucial for carbon storage. Carbon levels in soil humus and crop-yield results showed that the RT-rr system enhanced soil fertility and crop productivity. Adoption of this tillage system would be beneficial both for environmental protection and economic development. |
| Key Words: carbon sequestration, organic carbon storage, purple paddy soil, tillage system |
| Citation: Huang, X. X., Gao, M., Wei, C. F., Xie, D. T. and Pan, G. X. 2006. Tillage effect on organic carbon in a purple paddy soil. Pedosphere. 16(5): 660-667. |
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