JOURNAL OF NATURAL RESOURCES ›› 2013, Vol. 28 ›› Issue (6): 981-993.doi: 10.11849/zrzyxb.2013.06.009

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Simulation and Prediction of Straw Return on Soil Carbon Sequestration Potential of Cropland in Jiangxi Province

LIN Fei-yan1,2, WU Yi-jin1, WANG Shao-qiang2, ZHOU Lei2, YANG Feng-ting2, SHI Hao2, CAI Jin-tao1,2   

  1. 1. College of City and Environmental Science, Huazhong Normal University, Wuhan 430079, China;
    2. Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, CAS, Beijing 100101, China
  • Received:2012-06-20 Revised:2012-10-31 Online:2013-06-20 Published:2013-06-20

Abstract:

Straw return and other farming management measures can effectively increase soil organic carbon (SOC) storage, thus contributing to mitigate the increase in the atmospheric CO2 concentration. Based on the EPIC model, which was validated using the database of long-term observation in Qianyanzhou and Yingtan experimental stations in Jiangxi Province. EPIC model was based on the meteorological information from 1990 to 2010 and soil database in Jiangxi Province, to simulate the paddy soil carbon sequestration potential from 2010 to 2030 under alternative crop residue return scenarios in Jiangxi Province. The results indicated that the top soil organic carbon stocks showed a decreasing trend under the straw removal(CR 0%) and straw incorporation 25% (CR 25%) scenarios, the ratio of loss is 21.3% and 6.5%, and an increasing trend in the case of straw incorporation 50%(CR 50%)and straw incorporation 100% (CR 100%)scenarios, the ratio of increasing is 5.4% and 11.9%;compare to the CR 0% scenario, the carbon sequestration potential of crop straw return scenarios of CR 25%, CR 50% and CR 100% are 6.43, 14.92 and 25.26 Tg C (1 Tg= 106 t) in paddy soils of Jiangxi Province. The simulating results demonstrated that conservation tillage (straw return) is an effective way to improve the paddy soil carbon sequestration.

Key words: soil organic carbon, carbon fixation, EPIC model, cropland ecosystems, straw return

CLC Number: 

  • S181