外源氮输入影响下沼泽化草甸湿地土壤有机碳矿化和N_2O排放动态研究  

Dynamics of N_2O Emission and Carbon Mineralization to Exogenous Nitrogen Input in Meadow Marsh Soil

作　　者：李英臣[1,2] 宋长春 侯翠翠[1,2] 宋艳宇[1,2] 

机构地区：[1]中国科学院东北地理与农业生态研究所,吉林长春130012 [2]中国科学院研究生院,北京100049

出　　处：《水土保持学报》2010年第4期140-143,147,共5页Journal of Soil and Water Conservation

基　　金：国家自然科学重点基金项目(40930527;40771189);国家重点基础研究发展计划(973)项目(2009CB421103);中国科学院重要方向性项目(KZCX2-YW-JC301)

摘　　要：采用室内模拟实验,研究沼泽湿地土壤N2O排放和有机碳矿化对不同外源氮输入浓度的响应特征。整个培养期(23 d)内N2O排放量为2 696.85(N0),5 362.61(N1),8 288.48(N2),7 903.84(N3)μg/kg,处理间差异达到极显著水平(p<0.01),随氮输入量增加呈现先增加后降低的趋势,表明适当的氮输入促进土壤N2O排放,过量的氮输入则对土壤N2O排放有一定的抑制作用。各氮输入处理有机碳矿化速率在培养期内各阶段都低于对照,各氮输入处理之间差异不显著,表明氮输入降低有机碳矿化速率。氮输入对土壤微生物量碳影响不大,而土壤微生物量氮随氮输入量增大而增大。By laboratory incubation experiment,we investigated the response of N2O emission and carbon mineralization to different nitrogen input in meadow marsh soil.The results showed that in the incubation period（23 d）,the total amount of N2O emission was 2 696.85（N0）,5 362.61（N1）,8 288.48（N2）,7 903.84（N3） μg/kg,the difference between treatments was very significant（p0.01）,indicated that appropriate nitrogen input promoted N2O emission,excessive nitrogen input restrained N2O emission in some degrees.The carbon mineralization rates of nitrogen inputs treatment was lower than control in every incubation phase,the difference was not significant between nitrogen input treatments,indicated that carbon mineralization was decreased after exogenous nitrogen input.Soil microbial carbon was not affected by exogenous nitrogen input,but the microbial nitrogen increased as the amount of nitrogen input increased.

关 键 词：氮输入 N2O排放 有机碳矿化 微生物量碳 微生物量氮 

分 类 号：X511[环境科学与工程—环境工程]