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当前位置: 首页 > 文章 > 草甸沼泽土壤硝化-反硝化作用和有机碳矿化对氮输入的响应 水土保持学报 2009,22 (3) 135-138+157
Position: Home > Articles > Response of Nitrification-Denitrification and Carbon Mineralization to Nitrogen Input in Meadow Marsh Soil Journal of Soil and Water Conservation 2009,22 (3) 135-138+157

草甸沼泽土壤硝化-反硝化作用和有机碳矿化对氮输入的响应

作  者：
李英臣;宋长春;刘德燕;王丽
单  位：
中国科学院东北地理与农业生态研究所
关键词：
氮输入;硝化;反硝化;N2O排放;有机碳矿化
摘  要：
通过室内培养实验,研究了草甸沼泽土壤N2O排放和反硝化损失对氮输入的响应特征,结果表明,在培养期(23 d)内N2O平均排放速率为0.32(N0),0.87(N1),17.69(N2),28.07(N3)μgN2O-N/(kg±.h),反硝化平均损失速率为0.25(N0),0.81(N1),22.29(N2),30.28(N3)μgN2O-N/(kg±.h),两者都随氮输入量增高而升高。其中,N3处理N2O平均排放速率和反硝化平均损失速率与对照差异显著(p<0.05),N1和N2与对照差异不显著。N2O排放总量占氮输入的比例为0.03%(N1),1.04%(N2),1.76%(N3),反硝化损失总量占氮输入的比例为0.04%(N1),1.29%(N2),1.93%(N3),均表现为随氮输入量的增大而增高。N1处理下有机碳矿化速率低于对照,而N2和N3有机碳矿化速率高于对照,说明低氮输入对有机碳矿化有一定抑制作用,高氮输入促进有机碳矿化。
译  名：
Response of Nitrification-Denitrification and Carbon Mineralization to Nitrogen Input in Meadow Marsh Soil
作  者：
LI Ying-chen1,2,SONG Chang-chun1,LIU De-yan1,2,WANG Li1,2(1.Northeast Institute of Geography and Agricultural Ecology,Chinese Academy of Sciences,Changchun 130012;2.Graduate School of Chinese Academy of Sciences,Beijing 100049)
关键词：
nitrogen input;nitrification;denitrification;N2O emission;carbon mineralization
摘  要：
A soil incubation experiment was conducted under laboratory condition to study the response of nitrification-denitrification and carbon mineralization to nitrogen input in meadow marsh soil.The result showed that during the incubation period(23 d),the average N2O emission speed was respectively 0.31(N0),0.87(N1),17.69(N2),28.07(N3) μgN2O-N/(kg±·h),the average denitrification speed was respectively 0.25(N0),0.81(N1),22.29(N2),30.28(N3) μgN2O-N/(kg±·h),and they all become higher along with high nitrogen input and the difference of N3 and N0 was significant(p<0.05),but the difference of N1,N2 and N0 was not significant.The amount of N2O emission account for the ratio of nitrogen input was 0.03%(N1),1.04%(N2),1.76%(N3),the amount of denitrification loss account for the ratio of nitrogen input was 0.04%(N1),1.29%(N2),1.93%(N3),and they were all higher along with nitrogen input.The carbon mineralization speed of N1 is lower than the control,but the carbon mineralization speed of N2 and N3 was higher than the control,this result showed that low nitrogen input restrained the carbon mineralization,however,high nitrogen input promoted carbon mineralization.

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