全球N_2O年释放总量及各类源相对贡献率初步分析

根据国际上最近确定的全球N2 O各释放源及其释放量估算值 ,推算了全球N2 O年释放总量及各类源的相对贡献率。得出全球N2 O年释放总量约 1 4 .7TgN2 O -N ,其中自然源和人为源分别占 57%和 4 3 %。年释放总量中N的生物地球化学过程约贡献92 %、非生物作用过程仅贡献 8% ;与土壤有关的释放源约贡献 70 %、农业土壤贡献2 0 %。控制土壤尤其是农业土壤和热带森林土壤的N2 O释放量是控制全球大气N2 O浓度上升的关键

A PRIMARY ANALYSIS OF GLOBAL N_2O EMISSION AND RELATIVE CONTRIBUTIONS OF SOME SOURCES

According to the global N\-2O sources and their current emissions, global N\-2O emissions and relative contributions of some sources are estimated. The results show that the global N\-2O emission per year is about 14.7 TgN\-2O\|N, in which 57% and 43% from natural and anthropogenic sources respectively, 92% from N biogeochemistry and only 8% from N abiology, 70% from soil\|related sources, and about 20% attributable to agricultural soil. The key measures to control the increasing atmospheric concentrations of N\-2O are to reduce N\-2O emissions from agricultural and tropical forest soils.