南方农业学报2017，Vol.48Issue(8)：1395-1401,7.DOI:10.3969/j.issn.2095-1191.2017.08.10
保护性耕作模式下早稻田甲烷排放特征
Characteristics of CH4 emission in early rice paddy field under conservation tillage
摘要
Abstract
[Objective]This paper aimed to research the effects of tillage methods on methane emission from early rice paddy fields,explore the environmental factors that affected methane emissions from paddy fields,and search for suit-able tillage pattern to reduce methane emissions from rice fields.[Method]Four treatments were set:conventional tillage and no-fertilization ,conventional tillage and fertilizer ,no-tillage and no-fertilizer and no-tillage and fertilization. Gaseous methane(CH4)was gathered by using static box method at rice tillering stage and heading stage. At the same time, earth temperature,gas-collection box temperature,ambient temperature,surface temperature,grass surface tempera-ture,relative humidity and wind speed were observed. The study explored the diurnal variation of CH4 emission fluxes in early rice paddy fields and the effect of no-tillage,fertilization and environmental factors on CH4 emission from paddy field.[Result]The emission of CH4 in early rice paddy fields was closely related to air temperature,surface temperature, temperature of soil in 5 cm depth,grass surface temperature,relative humidity and wind speed. CH4 emission fluxes un-der four treatments were significantly related to the environmental factors(P<0.05) especially at tillering stage. The daily average CH4 emission fluxes under different treatments were different. At tillering stage,daily average CH4 emission fluxes were as follows: conventional tillage and fertilization>conventional tillage and no-fertilization>no-tillage and fertilization>no tillage and no-fertilization;the rank at heading stage was conventional tillage and no-fertilization>no-tillage and fertilization>conventional tillage and fertilization>no tillage and no-fertilization.[Conclusion]The CH4 emission from paddy field in no-tillage treatment is lower than conventional tillage treatment. Fertilization results in an increase in CH4 emission from paddy fields at the tillering stage,but leads to a decrease in CH4 emissions from early rice paddy fields at heading stage. The extension of no-tillage contributes to the reduction of CH4 emissions from rice fields,which can be pro-moted in cultivation for emission reduction.关键词
早稻/稻田/甲烷(CH4)/日变化/保护性耕作Key words
early rice/paddy field/methane(CH4)/diurnal variation/conservation tillage分类
农业科技引用本文复制引用
卢廷超,徐培智,张仁陟,解开治,卢钰升,顾文杰..保护性耕作模式下早稻田甲烷排放特征[J].南方农业学报,2017,48(8):1395-1401,7.基金项目
广东省农业面源污染治理项目(2016B070701009) （2016B070701009）
广东省科技计划项目(2014B090904068,粤科规财字[2014]208号) （2014B090904068,粤科规财字[2014]208号）
