不同耕作措施下江苏省稻田土壤固碳潜力的模拟研究  

Simulation of Carbon Sequestration Potential from Paddy Fields in Jiangsu Province Under Different Tillage Practices

作　　者：徐胜祥[1,2] 史学正[1,2] 赵永存[1,2] 于东升[1,2] 王世航[1,2] 辛景树[3] 任意[3] 

机构地区：[1]土壤与农业可持续发展国家重点实验室(中国科学院南京土壤研究所),南京210008 [2]中国科学院研究生院,北京100049 [3]全国农业技术推广服务中心,北京100026

出　　处：《土壤》2012年第2期253-259,共7页Soils

基　　金：中国科学院知识创新工程重要方向项目(KZCX2-YW-Q1-07和KZCX2-EW-QN404);中国科学院战略性先导科技专项项目(XDA05050509);国家重点基础研究发展计划(973计划)项目(2010CB950702)资助

摘　　要：以江苏省稻田为对象,整合DNDC和1:100万土壤数据库,以土壤图斑为基本模拟单元,定量估算少耕、免耕和综合措施(少耕+30%秸秆还田)下江苏省稻田土壤的固碳潜力(0～30 cm)。模拟结果表明:相对于传统耕作,采用少耕、免耕和少耕+30%秸秆还田均可明显地增加稻田SOC的积累,其在2009—2050年间的固碳潜力分别为24.5、47.7和43.8 Tg。免耕和少耕+30%秸秆还田条件下稻田固碳速率大约是少耕的2倍。结合实际情况,少耕+30%秸秆还田将是最可行的固碳措施之一。In this study a soil polygon-based modeling method was developed by integrating DNDC with a 1：1,000,000 soil database to quantify C sequestration potential from paddy fields in Jiangsu Province under reduced tillage,no-tillage,and combined tillage（i.e.,reduced tillage and increasing crop residue return to 30%）.The results indicated that C sequestration potential under modeled tillage practices significantly increased compared to the conventional tillage,and was estimated to be 24.5,47.7 and 43.8 Tg between 2009 and 2050 under reduced tillage,no-tillage,and combined tillage,respectively.The C sequestration rate under no-tillage,and combined tillage was nearly 2 times higher than under reduced tillage.In view of actual situation,the combined tillage will be one of the most realistic tillage of C sequestration for paddy fields in Jiangsu Province.

关 键 词：DNDC模型 土壤有机碳 水稻土 固碳潜力 江苏省 

分 类 号：S154.3[农业科学—土壤学]