Pedosphere 17(1): 1--10, 2007
ISSN 1002-0160/CN 32-1315/P
©2007 Soil Science Society of China
Published by Elsevier B.V. and Science Press
| Simulation of soil organic carbon dynamics in Chinese rice paddies from 1980 to 2000 |
ZHANG Wen , YU Yong-Qiang, SUN Wen-Juan and HUANG Yao |
| State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029 (China). E-mail: zhangween@yahoo.com.cn |
| ABSTRACT |
| Changes in soil organic carbon (SOC) of rice paddies in China were simulated from 1980 to 2000 by linking a coupled bio-physical model to GIS database. The coupled model consists of two sub-models including Crop-C for simulating net primary productivity and hence residue retention and Soil-C for computing the turnover rates of SOC. The GIS database included parameters of climate, soils and agricultural activities with the resolution of 10 km × 10 km. Model simulation indicated that Chinese rice paddies covering 22.6 Mha sequestrated a considerable amount of C, about 0.15 ± 0.07 Pg C from 1980 to 2000. Annual sequestration rate increased sharply from -180 ± 45 kg C ha-1 year-1 in 1980 to 440 ± 170 kg C ha-1 year-1 in 1989. Thereafter, a steady sequestration rate of 460 ± 170 kg C ha-1 year-1 occurred till 1994 and declined since then. Approximately 84% of the Chinese rice paddies sequestrated carbon, while 15% lost carbon and 1% kept balance over the 20 years. Great SOC sequestration occurred in eastern, southern and central China, while a slight decline of SOC existed in some regions of northeastern and southwestern China. |
| Key Words: Chinese rice paddy, GIS, model estimates, SOC |
| Citation: Zhang, W., Yu, Y. Q., Sun, W. J. and Huang, Y. 2007. Simulation of soil organic carbon dynamics in Chinese rice paddies from 1980 to 2000. Pedosphere. 17(1): 1-10. |
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