CAJ | 학술논문

随着全球气温的不断升高,温室气体减排成为研究的热点.该文旨在研究不同耕作措施下双季稻田CH_4及N_2O排放特征及其消长关系,为稻田温室气体减排及土壤固碳潜力评价提供依据.试验在湖南省宁乡县进行,通过静态箱法测定翻耕秸秆还田(CT)、旋耕秸秆还田(RT)、免耕秸秆还田(NT)的稻田CH_4及N_2O 排放.结果表明:CH_4排放丰要来自于晚稻田,翻耕、旋耕和免耕晚稻田CH_4排放分别占研究时段CH_4排放的69%,67%,73%;各处理冬闲季CH_4排放均不到研究时段排放量1%,冬闲CH_4排放量为RT>CT>NT,差异显著;N_2O排放时间变异性较大,早稻稻出N_2O排放量为RT>NT>CT,晚稻稻田 N_2O 排放量为NT>RT>CT,冬闲期各处理稻田N_2O 均为负排放;从研究时段排放量分析,翻耕秸秆还田有利于减少 N_2O 排放,免耕秸秆还田有利于减少CH_4排放;CH_4与N_2O 排放呈显著负相关,冬闲季稻田CH_4及N_2O排放相关性不显著.总之,NT减少了CH_4排放,虽N_2O排放略有增加,但CH_4及N_2O引发的综合温室效应有所减弱.
수착전구기온적불단승고,온실기체감배성위연구적열점.해문지재연구불동경작조시하쌍계도전CH_4급N_2O배방특정급기소장관계,위도전온실기체감배급토양고탄잠력평개제공의거.시험재호남성저향현진행,통과정태상법측정번경갈간환전(CT)、선경갈간환전(RT)、면경갈간환전(NT)적도전CH_4급N_2O 배방.결과표명:CH_4배방봉요래자우만도전,번경、선경화면경만도전CH_4배방분별점연구시단CH_4배방적69%,67%,73%;각처리동한계CH_4배방균불도연구시단배방량1%,동한CH_4배방량위RT>CT>NT,차이현저;N_2O배방시간변이성교대,조도도출N_2O배방량위RT>NT>CT,만도도전 N_2O 배방량위NT>RT>CT,동한기각처리도전N_2O 균위부배방;종연구시단배방량분석,번경갈간환전유리우감소 N_2O 배방,면경갈간환전유리우감소CH_4배방;CH_4여N_2O 배방정현저부상관,동한계도전CH_4급N_2O배방상관성불현저.총지,NT감소료CH_4배방,수N_2O배방략유증가,단CH_4급N_2O인발적종합온실효응유소감약.
Greenhouse gas emission is becoming a very important issue with the continuous increasing in the global temperature. In order to evaluate carbon sequestration potential of paddy and reducing emission of greenhouse gas,tillage effects on CH4 and N_2O emissions from paddy soil and the trade-off relationship between CH_4 and N_2O wereexplored. The closed chamber method was used to measure the CH_4 and N_2O emission from the paddy field with the treatments of conventional tillage (CT), rotary tillage (RT), no-tillage (NT) at Ningxiang County, Hunan Province. The results show as following. 1) CH_4 emission mainly comes from the late rice paddy, which accounted for 69%, 67%, 73% of the studied period under CT, RT and NT, respectively; 2) CH_4 emission of all treatments attributed to less than 1% in the winter-fallow season, while the differences of the emission among three treatments are significant with RT>CT>NT; 3) N_2O emission shows highly temporal variability that N_2O emission in early rice paddy is RT>NT>CT, while in late rice paddy is NT>RT>CT, and the N_2O is absorbed in winter-fallow season; 4) CT is beneficial to decreasing N_2O emission during the studied period, while NT is beneficial to decreasing CH_4 emission; 5) During the studied period,correlation between CH4 and N_2O shows negative significantly, but the correlation between CH4 and N_2O in winter-fallow season is not significant. In general, though increasing N_2O emission appreciably, NT is beneficial to decreasing CH_4 emission, and the comprehensive greenhouse effect of N_2O and CH_4 is also decreased.