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Position: Home > Articles > EMISSION FLUX OF NITROUS OXIDE FROM FOREST SOILS IN BEIJING Scientia Silvae Sinicae 2001,37 (5) 57-63

北京低山区两种人工林土壤中N_2O排放通量的研究

作  者:
孙向阳;徐化成
单  位:
北京林业大学
关键词:
森林土壤;温室气体;氧化亚氮(N2O);排放通量
摘  要:
N2 O是一种重要的温室气体 ,其主要的排放源是土壤。本研究采用静态封闭箱式技术在 1997~1998年对北京西山低山区元宝枫和油松人工林地土壤中N2 O的排放通量进行了原位测定。研究结果表明该地区森林土壤为大气N2 O气体的一个重要的源 ,年平均排放通量为 3 16 μg·m- 2 h- 1 ,变动范围为 - 1 2~ 7 92μg·m- 2 h- 1 。林地土壤N2 O的排放有较明显的季节变化趋势 ;夏季最高 ,春秋季次之 ,冬季最低甚至出现负值。排放通量的大小主要决定于土壤温度、土壤湿度及测定时前 5d内降水量等因子。研究还表明N2 O的排放通量有一定的日变化趋势 ;6 :0 0出现最低点 ,9:0 0和 18:0 0出现最高点
译  名:
EMISSION FLUX OF NITROUS OXIDE FROM FOREST SOILS IN BEIJING
作  者:
Sun Xiangyang\ Xu Huacheng (Beijing Forestry University\ Beijing 100083)
关键词:
Forest soils, Greenhouse gases, Nitrous oxide (N 2O), Emission flux
摘  要:
Nitrous oxide (N 2O) is one of the important kinds of greenhouse gases, and it mainly comes from soil ecosystem.The soil N 2O emission flux in the plantation of Acer truncatum and Pinus tabulaeformis woodland was measured in situ using static closed chamber technique at the year of 1997~1998 in Xishan area,Beijing,China.The annual N 2O emission flux ranges from -1.2 to 7.92 μg·m -2 h -1 with mean of 3.16 μg·m -2 h -1 .It has seasonal variation as the highest flux in summer,the second in spring and autumn,and the lowest in winter.The N 2O emission flux is mainly determined by soil temperature,soil moisture and the precipitation within 5 days before the N 2O emission rate also has undulated diurnal variation that comes the lowest in 6'oclock and the peak in 9 and 18'oclock.

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