华北平原不同作物-潮土系统中N_2O排放量的测定

N_2O Emission from Different Crop-Fluvo-aquic Soil Systems in the North China Plain

在中国科学院封丘农业生态试验站应用原状土柱培养法测定了华北平原主要农作物 -潮土系统中N2O的排放量 ,比较了不同作物对农田土壤中N2O排放的影响。结果表明 ,大豆、花生、玉米和棉花4种作物系统的N2O排放通量有所差异 ;生长期间不施氮肥处理下N2O排放总量为0.57—1.00kgN·hm -2,施氮肥处理下为1.48—3.12kgN·hm-2,作物系统间有较大差异。氮肥产生的N2O -N占施肥量的0.57 %—1.58 % ,其中玉米作物系统是棉花作物系统的近3倍。

Flux of N2O emission from different crop- Fluvo-aquic soil systems in the north China plain was measured by a soil core incubation method. The results showed that the total amounts of N2O emission from soybean, peanut, maize and cotton, the 4 crop-soil systems without fertilization were in an range of 0.57—1.00 kgN·hm-2. In the case of application of nitrogen(N) fertilizer, the corresponding figure was in an arrange of 1.48—3.12 kgN·hm-2, indicating a great difference among the 4 crop-soil systems. N2O emission derived from N fertilizer applied accounted for 0.57% —1.58% of applied N with the highest in maize and the lowest in cotton, respectively, the former is nearly 3 times of the latter.