冬水田休闲期温室气体排放通量的研究  

CH_4,CO_2 and N_2O Emissions from the Year-round Flooded Paddy Field at Fallow Season

作　　者：马秀梅[1] 朱波[1] 杜泽林 郑循华[3] 

机构地区：[1]中国科学院成都山地灾害与环境研究所,四川成都610041 [2]重庆化工设计研究院,重庆400039 [3]中国科学院大气物理研究所,北京100029

出　　处：《农业环境科学学报》2005年第6期1199-1202,共4页Journal of Agro-Environment Science

基　　金：中国科学院知识创新工程重大项目(KZCX1-SW-01-01B);国家自然科学基金重点项目(40331014)

摘　　要：冬水田生态系统在西南地区大面积存在,长期淹水,其温室气体排放可能对中国温室效应有重要贡献。采用静态箱-气相色谱法对川中丘陵地区冬水田休闲期温室气体排放通量进行了原位观测研究,获得冬水田休闲期CH4、CO2、N2O的平均排放通量依次为5.37mg·m-·2h-1、81.88mg·m-·2h-1、0.01μg·m-·2h-1。同时研究发现,冬水田休闲期温室气体排放通量具有明显的动态变化,土壤温度和水分在很大程度上影响着3种温室气体的排放通量。研究还表明,改冬水田为水旱轮作可减少甲烷排放。The year-round flooded paddy field was widely distributed in the southwestern China. The emission of CH4, CO2, N2O might be an important contribution to greenhouse gases in China, so it was necessary to know the emission fluxes of CH4, CO2, N2O from this ecosystem. CH4, CO2, N2O were measured by static chamber-gas chromatographic techniques in non-cropping season of this year-round flooded paddy field in hilly area of the central Sichuan Basin. The results indicated that during non-cropping season, the mean emission fluxes of CH4, CO2, N2O from wintry paddy field were 5.37mg·m^-2·h^-1、1.88mg·m^-2·h^-1.0.01μg·m^-2·h^-1 respectively, and the emission fluxes of CH4, CO2, N2O showed obvious dynamic characteristics, mainly influenced by temperature and water level of paddy field. There had significant exponential relationships between emission fluxes of CH4 and 5cm soil temperature, air temperature. Meanwhile, the water level of paddy field had great effects on emission fluxes of CH4 and CO2. Changing the year-round flooded paddy field to the rotation of rice-wheat or rice-rape could be an effective way for reducing the release of CH4.

关 键 词：冬水田 休闲期 三种温室气体 排放通量 

分 类 号：S152.6[农业科学—土壤学]