Measurements of atmospheric N_2O concentration and its emission fluxes from soil in China  

作　　者：王少彬 宋文质 苏维瀚 曾江海 王智平 张玉铭 

机构地区：[1]Research Centre for Eco-Environmental Sciences,Chinese Academy of Sciences,Beijing 100085,China [2]Institute of Agricultural Modernization,Chinese Academy of Sciences,Shijiazhuang 050021,China

出　　处：《Science China Chemistry》1995年第9期1101-1107,共7页中国科学（化学英文版）

摘　　要：Air samples in China were collected and determined for the concentration of N_2O. The production rates of N_2O from agricultural soils were measured with the chamber method.The results in- dicate that the background concentration of N_2O averages(308±5)×10^(-9)in 1989,which is close to that ob- tained at the other background stations abroad.However,at both urban and rural areas,atmospheric N_2O concentrations are higher.N_2O emission fluxes from several farmlands are different and dependent on the fac- tors of agricultural practice and climate.But their magnitudes are at the same order.Preliminary calculation shows that the released N_2O-N from agricultural sources(cultivated soil and N-fertilizers)amounts to 122 Gg/a in China in 1990.Air samples in China were collected and determined for the concentration of N₂O.The production rates of N₂O from agricultural soils were measured with the chamber method.The results in-dicate that the background concentration of N₂O averages（308±5）×10^-9in 1989,which is close to that ob-tained at the other background stations abroad.However,at both urban and rural areas,atmospheric N₂Oconcentrations are higher.N₂O emission fluxes from several farmlands are different and dependent on the fac-tors of agricultural practice and climate.But their magnitudes are at the same order.Preliminary calculationshows that the released N₂O-N from agricultural sources（cultivated soil and N-fertilizers）amounts to 122Gg/a in China in 1990.

关 键 词：N_2O atmospheric concentration SOFT N-FERTILIZER flux. 

分 类 号：S153[农业科学—土壤学]