[Effects of no-tillage and fertilization on paddy soil CH4 and N2O emissions and their greenhouse effect in central China].
By using static chamber-gas chromatographic techniques, the CH4 and N2O emissions from the paddy soil in southeast Hubei were measured. Four treatments were installed, i.e., no-tillage plus no-fertilization (NT0), conventional tillage plus no-fertilization (CT0), no-tillage plus fertilization (NTC), and conventional tillage plus fertilization (CTC). In all treatments, the CH4 emission had a seasonal variation of increasing first and decreasing then, while the N2O emission had no significant seasonal variation. Fertilization increased the CH4 and N2O emissions significantly. NT0 increased the CH4 emission and decreased the N2O emission significantly, compared with CT0; NTC only decreased the CH4 emission and increased the N2O emission slightly, compared with CTC. The analysis on the integrated greenhouse effect of CH4 and N2O showed that NT0 increased the effect by 25.9%, compared with CT0, while NTC decreased the effect by 10.1%, compared with CTC. Therefore, a reasonable arrangement of fertilization and no-tillage could reduce the integrated greenhouse effect of CH4 and N2O from paddy field.
Dai
Guang-zhao
GZ
Ministry of Agriculture Key Laboratory of Huazhong Crop Physiology, Ecology and Production, Huazhong Agricultural University, Wuhan 430070, China. gzdai1111@yahoo.cn
Li
Cheng-fang
CF
Cao
Cou-gui
CG
Zhan
Ming
M
Tong
Le-ga
LG
Mei
Shao-hua
SH
Zhai
Zhong-bing
ZB
Fan
Duan-yang
DY
D000383:Agriculture / Q000379:methods; D002681:China; D005308:Fertilizers; D017752:Greenhouse Effect; D000432:Methanol / Q000032:analysis*; D009609:Nitrous Oxide / Q000032:analysis*; D012275:Oryza / Q000254:growth & development* / Q000378:metabolism; D012987:Soil / Q000032:analysis*
D005308:Fertilizers; D012987:Soil; D009609:Nitrous Oxide; D000432:Methanol