摘要
本文以双季稻区保护性耕作定位试验为研究对象,测定了保护性耕作下土壤不同层次总有机碳、活性碳的动态变化,并计算了各处理的碳库活度、活度指数、碳库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,0～10cm和10～20cm土壤总有机碳分层受耕作方式影响大,而活性碳分层受秸秆还田影响大。秸秆还田提高土壤各层总有机碳,免耕提高土壤0～10cm总有机碳,而旋耕和翻耕提高土壤10～20cm总有机碳;其中旋耕提高土壤0～10cm总有机碳,以及翻耕和秸秆还田提高土壤各层总有机碳具有可持续增加的潜力。秸秆还田和少免耕提高土壤0～20cm土层活性碳。秸秆还田提高土壤0～10cm总有机碳、活性碳、稳态碳、碳库指数以及碳库管理指数,同时提高了10～20cm各项碳库指数,但降低了0～10cm碳库活度和活度指数;免耕和旋耕分别提高土壤0～10cm和10～20cm的各项碳库管理指标。
The global soil organic carbon pool is the second largest terrestrial carbon reservoir, and soil carbon is a major determinant of agricultural system sustainability and changes can occur in both total and active, or labile, carbon pools. The experiment started in 2005 including four treatments： plow tillage without stubble returned, plow tillage with stubble returned, rotary tillage with stubble returned and notillage with stubble returned. The total organic carbon （TOC）, active carbon （AC） pool and carbon pool management index （CPMI） under conversation tillage in paddy field area were discussed from 2005 to 2006. The results indicated that TOC and AC pool decreased with the depth of soil layer. The stratification ratios （SR） of TOC increased significantly under no-tillage and minimum tillage compared to moldboard plow tillage, while, the SR of AC under stubble returned was significantly higher compared to no stubble returned. Stubble returned increased TOC at 0～20 cm soil depth, while the TOC was increased in 0～10 cm soil layer under no-tillage, and in 10～20 cm layer under minimum tillage and moldboard plow tillage. Moldboard plow tillage and stubble returned can continually improve TOC in 0～20 cm layer, and minimum tillage enhanced TOC in 0～10 cm layer. The AC under stubble returned, minimum tillage and no-tillage was increased. Stubble returned ad- vanced carbon pool index （CP1）, CPMI in 0～10 cm layer and every index in 10～20 cm layer, but decreased active （A） and active index （AI） in 0～10 em layer. Minimum tillage and no-tillage increased every index of 0～ 10 cm and 10-20 cm layer pool respectively.
出处
《农业环境科学学报》
CAS
CSCD
北大核心
2008年第1期248-253,共6页
Journal of Agro-Environment Science
基金
国家科技支撑计划(2006BAD15B01)
农业部重点项目“保护性耕作技术模式及其对农业可持续发展影响”
