氧化亚氮在森林和草原中的地-气交换  

N 2O Exchanges between Atmosphere and Territory from Forest and Grassland

作　　者：刘晔[1] 牟玉静[1] 钟晋贤[1] 杨文襄[1] 

机构地区：[1]中国科学院生态环境研究中心

出　　处：《环境科学》1997年第5期14-18,共5页Environmental Science

基　　金：国家自然科学基金

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.

关 键 词：地气交换 氧化亚氮 森林 草原 

分 类 号：X144[环境科学与工程—环境科学]