摘要
通过室内培养试验,研究秸秆还田条件下水氮互作对土壤脲酶活性及N_2O排放的影响,探讨土壤脲酶活性与N_2O排放的关系,为秸秆还田下的合理施氮及减少温室气体排放提供理论依据。实验结果表明:在施氮量相同的情况下,土壤含水量为田间持水量40~45%处理的土壤脲酶活性均显著高于土壤含水量为田间持水量60~65%、80~85%处理下的土壤脲酶活性;随着土壤中氮输入强度的增加,土壤脲酶活性增强,与N_0相比,N_1、N_2、N_3分别增加了10.8%、11.3%、13.7%。4个不同氮输入强度下,土壤N_2O排放通量高低的次序为:N_2>N_1>N_3>N0,不同施氮处理土壤N_2O排放通量在1.54~33.21μg N_2O·m^(-2)·h^(-1);3种土壤含水量下施氮第2周时达到N_2O排放高峰,在第4周开始,随着培养时间的延长,土壤N_2O排放通量呈迅速递减趋势。经相关分析得知土壤脲酶活性与N_2O排放通量之间存在极显著的负相关系数,即随着培养时间的延长,土壤脲酶活性逐渐增加,N_2O排放通量逐渐呈下降趋势。
Through laboratory incubation experiment, Study on soil urease activity and N2O emission of straw returning under water-nitrogen interaction and their correlation. Rational nitrogen application and provide a theoretical basis for reducing emissions of greenhouse gases under straw returning.The experimental results show that： In the same amount of nitrogen, soil moisture holding capacity of 40%-45% treatment for field soil urease activity were significantly higher than the soil moisture field to 60%-65%, 80%-85% treatment; With the increase of nitrogen input intensity in the soil, enhances soil urease activity, compared with No, N1, N2, N3 were increased by 10.8%, 11.3%, 13.7%. 4 different nitrogen input intensity, the soil N2O emission flux level of the order is： N2 〉 N1 〉 N3 〉 N0, different nitrogen treatments soil N2O emission flux in the 1.54- 33.21 gN2O m-2 h-1. 3 kind of soil moisture, nitrogen two weeks to N2O emission peak, at the start of the fourth week, along with the prolongation of culture time, soil N2O emission flux is rapidly decreasing trend.There is a negative correlation significantly between soil urease activity and N2O emission flux, that is with the time of incubation, soil urease activity increased, N2O emission flux gradually decreased.
出处
《吉林农业科技学院学报》
2015年第4期24-27,32,共5页
Journal of Jilin Agricultural Science and Technology University
基金
吉林省自然科学基金项目(20130101090JC)
吉林农业科技学院大学生创新科研项目(2013)
关键词
水氮互作
土壤脲酶
N2O排放
water-nitrogen interaction
soil urease
N2O emission
