保护性耕作下土壤碳库管理指数的研究  

Study on Soil C Pool Management Index of Conversation Tillage

作　　者：李琳[1] 李素娟[1] 张海林[1] 陈阜[1] 

机构地区：[1]中国农业大学农学与生物技术学院,北京100094

出　　处：《水土保持学报》2006年第3期106-109,共4页Journal of Soil and Water Conservation

基　　金：国家重大科技专项:粮食主产区保护性耕作制与关键技术(2004BA520A14)

摘　　要：以保护性耕作长期定位试验为研究对象，分析了保护性耕作对土壤不同层次的总碳、活性碳的影响，并计算了各处理的碳库活度、碳库活度指数和碳库管理指数。结果表明，土壤总有机碳和活性碳均随土层的增加而减少，其0～30cm平均总有机碳含量大小为旋耕〉免耕〉翻耕〉对照，秸秆还田提高土壤耕层总有机碳，旋耕和免耕提高表层土壤有机碳．且差异达到显著水平；土壤活性碳平均含量为旋耕〉翻耕〉对照〉免耕，旋耕和翻耕提高土壤活性碳，免耕则降低土壤活性碳，尤其是10～20cm土层活性碳比旋耕下降了27．33％。华北平原0～30cm土层的碳库各项指数受表层的影响比较大，其中保护性耕作（少免耕和秸秆还田）能增加土层的总有机碳、稳态碳和碳库指数；而翻耕秸秆还田则提高了土壤的A和AI，少免耕则降低了土壤的A和AI；就碳库管理指数来讲，秸秆还田的贡献大于耕作措施。The TOC（total organic carbon）, AC （active carbon） pool and CPMI（carbon pool management index） of soils in long term conversation tillage were discussed. The results indicated that TOC and AC pool were decreased with deeper layer ,The average TOC order of 0～30cm by conversation tillage was X （minimum tillage） M（no-tillage）〉F（moldboard plow tillage）〉CK. Stubble return increased TOC in 0～20 cm layer, while X and M significant increased TOC in 0～10 cm layer. The average AC order of 0～30 cm layer by conversation tillage was X 〉 F 〉CK〉M. X and F enhanced AC, while M reduced AC especially in 10～20 cm layer it was 27.33% lower than X. The average CPMI was effect by 0～10cm layer in Huabei plain, and conversation tillage improved TOC, UAC（unactive carbon） and CPMI. F added A and AI, while X and M lessened them. Stubble return effect more than tillage form for CPMI.

关 键 词：保护性耕作 总有机碳 活性碳 碳库管理指数 

分 类 号：S153.61[农业科学—土壤学] S157.42[农业科学—农业基础科学]