植物——大气N2O的一个潜在排放源

N₂₂和CH₄的重要温室气体。目前,全球N₂₂₂O不仅是一个普遍存在的自然现象,而且其排放量可达到与土壤排放相比较的水平,因而植物可能是未知的大气N₂O的一个重要排放源;植物排放N₂O受植物的种类、生长发育阶段、养分供给、光照强度及CO₂浓度等因素的影响。

PLANT: A POTENTIAL SOURCE OF THE ATMOSPHERIC N2O

N 2O is the third leading greenhouse gas, next to CO 2 and CH 4, in contribution to global warming. Till now, large uncertainties still exist in the global budget of sources and sinks of N 2O, and possible there are certain important sources of N 2O unknown. In this paper, major results obtained by authors and their colleagues over more than 10 years were reported. The results showed that emission of N 2O by plant is a universal phenomenon in nature, and its flux can be comparable with that from soil, hence plant may be an unknown important source of the atmospheric N 2O. N 2O emission by plant is controlled by species and growing stages of plants, nutrient supply, illumination and CO 2 concentration. In this paper, also, the light regulation model of N 2O emission by plant was presented, and the influence of N 2O emission by plant on global, especially on terrestrial ecosystem budget of N 2O was discussed.