摘要
采用田间试验研究不同施肥处理对棕壤N2O排放量的影响。结果表明,N2O释放量随着耕层土壤硝态氮含量增加而上升。不同施肥处理对N2O排放量影响不同,低氮处理(N1)排放量(整个玉米生育期按185d计算)为1.18kg·hm-2,高氮处理(N2)为2.39kg·hm-2。随着施氮量的增加,反硝化作用加强,N2O排放量上升,以N2O形式损失加剧。相同施氮水平条件下,随着有机肥施入量的增加土壤N2O排放量上升,其中以高氮高有机肥处理(M2N2)N2O排放量最高,达到了7.05kg·hm-2,占所投入氮肥的2.34%。相同氮素供应水平条件下增施磷、钾肥,也会增加N2O排放量。整个玉米生育时期通过N2O排放损失的肥料占投入氮肥比例为0.99%～2.46%。
Field experiment was conducted to investigate the effects of different fertilization on N2O emission in Brown field. The results showed that there was a pretty correlation between the amount of N2O emission and quantity of NO^-3-N. The nitrogen would loss by the form of N2O in long-term fertilization regime. The amount of N2O emission would increase with the quantity nitrogen input. The amount was 2.39 9kg·hm^-2 under higher nitrogen treatment and was more two times than under lower nitrogen treatment. The amount N2O emission would increase with organic fertilizer input also. Among these the amount of N2O emission was highest under M2N2 treatment. It was 7.05 kg·hm^-2and ratio of 2.34% of all input. At the same time, adding P fertilizer and K fertilizer would increase the amount N2O emission. In the whole stage, the rage on the emission of N2O accounted for nitrogen input was from percent 0.99%-2.46%.
出处
《生态环境》
CSCD
北大核心
2007年第2期560-563,共4页
Ecology and Environmnet
基金
辽宁省自然科学基金项目(972119)
关键词
棕壤
长期定位试验
N2O排放量
玉米
brown soil
Iong-term fertilization regime
n2o emission
maize
