Effects of agricultural management practices on carbon emissions in paddy fields | 稻田管理措施对土壤碳排放的影响

中国人. 稻田土壤是最重要碳库之一,农田管理措施影响着稻田土壤碳排放。本文综合论述了本课题组过去几年的研究成果,并结合国内外其它相关研究,分析和讨论稻田养鸭、灌溉方式、氮肥施用和耕作措施对土壤碳排放的影响。研究指出,稻田养鸭有效降低稻田温室效应,间歇灌溉降低CH4排放,施氮肥不影响土壤碳排放,而免耕有效降低土壤碳排放。由于土壤碳排放的复杂性、生物物理环境的异质性以及人类活动的干扰及其相互之间的多重影响和综合作用,进一步研究不同农田管理措施下稻田土壤碳排放的时空变化规律及其影响因子,对于取得降低土壤碳排放的有效技术、方法和措施,正确估算和评价稻田生态系统碳源/汇强度及其对大气CO2浓度变化的贡献提供科学依据。

英语. Paddy soil is one of the most important carbon storages, which is affected by agricultural management practices. The achievements obtained in past researches were reviewed and the effects of agricultural management practices on carbon emissions, including the stocking of duck in paddy field, irrigation, N fertilization and tillage, were discussed. The results indicated that raising ducks in paddy field significantly decreased greenhouse effects, intermittent irrigation reduced CH4 emissions, N fertilization did not affect carbon emissions, and no-tillage had a significant decrease in carbon emissions. However, due to the complexity of soil carbon emission process, the heterogeneity of paddy environment and the human activity, it is inaccurate to assess the effects of agricultural management practices on carbon emissions, and thus it is necessary to further discuss the spatio-temporal changes in carbon emissions under different agricultural management practices for accurate assessment of the effects of carbon emissions on global warming.