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机构地区:[1]西南大学三峡库区生态环境教育部重点实验室西南大学资源环境学院,重庆400715 [2]重庆市农业资源与环境研究重点实验室,重庆400716
出 处:《地理科学》2011年第4期485-489,共5页Scientia Geographica Sinica
基 金:国家自然科学基金项目(40805050和41005069);教育部博士点新教师基金(200806351014);中央高校基本科研业务费专项
摘 要:以位于西南大学试验农场的紫色土长期免耕试验田为研究对象,探讨不同耕作方式-冬水田平作(DP)、水旱轮作(SH)、垄作免耕(LM)、厢作免耕(XM)和垄作翻耕(LF)对紫色水稻土总有机碳、活性有机碳及稳态碳的影响。结果表明,在0~60 cm的土壤深度内,不同耕作方式下总有机碳的平均含量为LM(22.74 g/kg)>DP(14.57 g/kg)>XM(13.73 g/kg)>LF(13.10 g/kg)>SH(11.92 g/kg);活性有机碳的平均含量为DP(3.67 g/kg)>LF(3.49 g/kg)>LM(3.28 g/kg)>XM(3.17 g/kg)>SH(2.69 g/kg);稳态碳占土壤总有机碳的百分比为LM(85%)>SH(78%)>XM(77%)>LF(75%)>DP(74%)。长期垄作免耕具有明显的碳截存效应和良好的固碳能力。The effects of tillage system on total soil organic carbon,soil active organic carbon and soil stable organic carbon were studied in a long-term field experimental station in Chongqing,China.The content of total soil organic carbon in the 0-60 cm soil layers under different tillage systems was LM: no-till and ridge culture with rotation of rice and rape system(22.74 g/kg) DP: conventional tillage with rice only system(14.57 g/kg) XM: no-till and plain culture with rotation of rice and rape system(13.73 g/kg) LF: tillage and ridge culture with rotation of rice and rape system(13.10 g/kg) SH: conventional tillage with rotation of rice and rape system(11.92 g/kg).The order of soil active organic carbon was LM(22.74 g/kg) DP(14.57 g/kg) XM(13.73 g/kg) LF(13.10 g/kg) SH(11.92 g/kg).The proportion of soil stable organic carbon to total soil organic carbon was LM(85%) SH(78%) XM(77%) LF(75%) DP(74%).Overall,long-term LM treatment performed good effects on the soil carbon sequestration and fixation.
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