摘要
采用箱式法，建立了一套完整的测定森林草原土壤Ｎ２Ｏ排放方法，并对我国北方的自然环境中Ｎ２Ｏ排放作了观测，得出其最大排放通量为２３μｇ／（ｍ２ｈ）．并发现森林草原土壤当温度低于１５℃时对Ｎ２Ｏ有吸收行为，其最大吸收通量为１８．９８４μｇ／（ｍ２ｈ）．
Nitrous oxide(N 2O) is not only a major greenhouse gas in the atmosphere,but also an important matter that can cause ozone depletion.The emission sources of N 2O are consisted by a large number uncertain minor sources.Besides agricultural soils,grassland and forest soils are also the major natural source of N 2O emissions. In this paper,a completed method to determine the N 2O emission flux from forest and grassland soil by a closed chamber installation was set up,and the N 2O emission at the natural environment was measured in northern China. The maximum value of N 2O emissions from forest and grassland soil is about 23μg/(m 2·h).A high rate of N 2O loss is observed when the temperature is lower than 15℃. The maximum value of N 2O negative emissions as high as 18.984 μg/(m 2·h) has been measured.
出处
《环境科学》
EI
CAS
CSSCI
CSCD
北大核心
1997年第5期14-18,共5页
Environmental Science
基金
国家自然科学基金
关键词
地气交换
氧化亚氮
森林
草原
N 2O,O 3,emission flux,source,sink,exchange between atmosphere and territory.
