摘要
为了研究黑麦草鲜草翻压还田对稻田温室气体排放的影响,该文利用静态箱-盆栽装置观测了尿素、黑麦草鲜草翻压还田、半量尿素与半量黑麦草鲜草混施和对照4个处理稻田CH4和N2O排放。结果表明:黑麦草鲜草翻压还田、半量尿素与半量黑麦草鲜草混施的CH4排放通量分别比对照增加了371%和210%,比尿素增加了152%和66%;尿素的CH4排放比对照高87%,差异均达到显著水平(P<0.05)。黑麦草鲜草翻压还田的CH4排放在3个时期(早稻移栽前,早稻生长期和晚稻生长期)分布均匀,约60%的CH4排放于早稻移栽前和早稻生长期。尿素的N2O排放分别为黑麦草鲜草翻压还田、半量尿素与半量黑麦草鲜草混施和对照的18倍、6.6倍和25倍。CH4和N2O的全球增温潜势(GWP)依次为黑麦草鲜草翻压还田>半量尿素与半量黑麦草鲜草混施>尿素>对照,差异均显著(P<0.05)。黑麦草鲜草翻压还田虽然增加了稻田CH4排放,但减少了N2O排放,抑制了尿素对N2O的排放。
Ryegrass-double rice rotation is an important cropping system and commonly adopted in Southem China. However, the effects of ryegrass incorporation on CH4 and N2O emissions from paddy soils have been seldom estimated. A chamber-pot combined device was applied in the current study to measure CH4 and N20 gases emitted from different treatments of urea （CF）, ryegrass incorporation at the same amount N as urea （RG）, half nitrogen from urea plus half nitrogen from ryegrass （RGCF） residue and the control （CK, no fertilizer）. Results indicated that total seasonal CH4 emission from RG and RGCF were 152%, 37 1% and 66%, 210% greater than that of CF and CK, respectively（P〈 0.05）. CF increased CH4 emission by 87%, when compared with CK（P〈0.05）. RG emitted CH4 evenly during the three observing phases （before early rice transplanting, early rice season and late rice season） and approximately 60% of total seasonal CH4 emission happened before early rice transplanting and during the early rice season. N20 emission from CF was 18, 6.6 and 25 times as large as RG, RGCF and CK, respectively. Global warming potential （GWP） values calculated from CH4 and N2O emissions were in following order： RG〉RGCF〉CF〉CK （P〈0.05）. Incorporation of ryegrass increased CH4 emission, but decreased N2O emission and restricted N2O emission from urea when urea was applied in conjunction with ryegrass.
出处
《农业工程学报》
EI
CAS
CSCD
北大核心
2011年第12期241-245,共5页
Transactions of the Chinese Society of Agricultural Engineering
基金
国家自然科学基金项目(31171509
30871491)
公益性行业(农业)科研专项(201103001)
"十二五"粮食丰产科技工程(2011BAD16B15)资助
