秸秆还田固碳增汇效果研究进展

摘要

Straw returning is not only a widely used measure for increasing soil fertility,but also an important carbon sequestration technology.Carbon sequestration potential of farmland,effect of straw returning on soil for organic carbon content and greenhouse gas emission,and net emission reduction of straw returning were discussed.The issues in current research were pointed out,and then the prospect for future work was drawn.The carbon-sink effect of straw returning was still uncertain.For the future,research on the effect of straw returning on soil carbon and greenhouse gas emission should be combined and carried out at the county level,and then the net emission reduction of straw returning can be calculated.In order to investigate how to increase the net emission reduction of straw returning,greenhouse effect induced by straw returning and its impact factors should be studied intensively.%秸秆还田是当今世界普遍重视的一项培肥地力的增产措施,同时也是重要的固碳措施.从中国农田土壤固碳潜力、秸秆还田对土壤有机碳含量及温室气体排放的影响、秸秆还田净减排能力等方面阐述了秸秆还田的固碳增汇效果,指出当前研究中存在的问题,并提出展望.目前对于秸秆还田的固碳增汇效果还存在一定的争议,今后的研究应以县域为单元,将秸秆还田对土壤碳库和温室气体总排放的影响有机结合起来,计算净减排能力.同时开展秸秆还田的温室效应及其影响因子研究,探讨如何减少秸秆还田的温室效应,从而提高秸秆还田的净减排效益.