南方稻田多熟制种植模式对农田土壤有机碳和系统净碳平衡影响研究

项目名称： 南方稻田多熟制种植模式对农田土壤有机碳和系统净碳平衡影响研究

项目编号： No.31501277

项目类型： 青年科学基金项目

立项/批准年度： 2016

项目学科： 食品科学、农学基础与作物学

项目作者： 龙攀

作者单位： 湖南农业大学

项目金额： 21万元

中文摘要： 利用南方稻田充足的光温水条件，发展多熟制种植是促进国家粮油生产的重要途径。作物生产与气候变化、土壤质量密切相关，而土壤有机碳是土壤肥力和土壤质量的重要保障，是维持土壤可持续生产的基础。在应对气候变化的背景下，促进土壤固碳，减少碳排放是农业生产的重要目标之一。目前关于南方稻田多熟制种植对土壤有机碳库影响和系统固碳潜力评价的研究很少。本研究以稻稻油、稻稻薯、稻稻肥、稻油、稻稻5种多熟制种植模式为对象，监测各种植模式下土壤总有机碳、活性有机碳、微生物量碳的变化以探明不同多熟制种植模式对土壤碳库的影响，并测定土壤团聚体及其结合态有机碳以分析不同多熟制种植模式对土壤碳库的影响机理；同时测定温室气体的排放，通过对系统碳固定和碳排放进行计算对系统净碳平衡进行评价,以期为推广南方稻田多熟制种植模式提供理论依据。

中文关键词： 多熟种植；土壤有机碳；土壤团聚体；温室气体；；净碳平衡

英文摘要： It is an important way to promote the production of grain and oil in our country by making full use of the adequate source of light, heat, and water in southern paddy and developing multiple cropping system. Crop production is closely related to climate change and soil quality, whereas soil organic carbon is an important guarantee for soil fertility and soil quality, and is the basis for maintaining sustainable production. In the context of combating climate change, promoting soil carbon and reducing carbon emission is one of the most important goals of agricultural production. Currently little has been done to research the effect of multiple cropping on soil organic carbon pool and the evaluation of the system’s carbon sequestration potential. In this research 5 kinds of multiple cropping system will be studied, including rice-rice-rape, rice-rice-potato, rice-rice-green manure, rice –rape, and double rice system. The dynamic of total organic carbon (TOC), labile organic carbon (LOC) and microbial organic carbon (MBC) will be tested to ascertain the effects of multiple cropping modes on soil carbon pool, soil aggregate and aggregate associated organic carbon also will be tested to analyze the mechanism of multiple cropping on soil carbon pool; Simultaneous the emission of greenhouse gas will be determined, carbon fixation and carbon emissions be calculated to evaluate the system’s net carbon balance, in order to provide a theoretical basis for the promotion of multiple cropping in the southern paddy system.

英文关键词： multiple cropping;soil organic carbon;soil aggregate;greenhouse gas;net carbon balance