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林业科学 ›› 2001, Vol. 37 ›› Issue (5): 57-63.doi: 10.11707/j.1001-7488.20010510

• 论文及研究报告 • 上一篇    下一篇

北京低山区两种人工林土壤中N2O排放通量的研究

孙向阳 徐化成   

  1. 北京林业大学,北京100083
  • 收稿日期:1900-01-01 修回日期:1900-01-01 出版日期:2001-09-25 发布日期:2001-09-25

EMISSION FLUX OF NITROUS OXIDE FROM FOREST SOILS IN BEIJING

Sun Xiangyang,Xu Huacheng   

  1. Beijing Forestry University Beijing 100083
  • Received:1900-01-01 Revised:1900-01-01 Online:2001-09-25 Published:2001-09-25

摘要:

N2O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N2O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N2O气体的一个重要的源,年平均排放通量为3.16μg·m-2h-1,变动范围为- 1 2~7 92μg·m-2h-1。林地土壤N2O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N2O的排放通量有一定的日变化趋势;6:00出现最低点,9:00和18:00出现最高点。

关键词: 森林土壤, 温室气体, 氧化亚氮(N2O), 排放通量

Abstract:

Nitrous oxide (N2O) is one of the important kinds of greenhouse gases, and it mainly comes from soil ecosystem.The soil N2O 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 N2O emission flux ranges from -1.2 to 7.92 μg·m-2h-1 with mean of 3.16 μg·m-2h-1.It has seasonal variation as the highest flux in summer,the second in spring and autumn,and the lowest in winter.The N2O emission flux is mainly determined by soil temperature,soil moisture and the precipitation within 5 days before the N2O emission rate also has undulated diurnal variation that comes the lowest in 6'oclock and the peak in 9 and 18'oclock.

Key words: Forest soils, Greenhouse gases, Nitrous oxide (N2O), Emission flux