内蒙古典型草原土壤N_2、N_2O、NO和CO_2排放的研究——土柱培养实验  

Influence of Grazing Effects on Soil N_2,N_2O,NO and CO_2 Emissions

作　　者：金春义[1,2] 王睿[2] 廖婷婷[2] 冯琪[2] 李静[1,3] 

机构地区：[1]西南大学资源环境学院,重庆400716 [2]中国科学院大气物理研究所大气边界层物理和大气化学国家重点实验室,北京100029 [3]重庆水利电力职业技术学院,重庆402160

出　　处：《中国农学通报》2012年第12期142-147,共6页Chinese Agricultural Science Bulletin

基　　金：公益性行业(农业)科研专项项目"农业源温室气体监测与控制技术研究"(201103039)

摘　　要：为了进一步了解内蒙古典型草原生长季内主要温室气体氧化亚氮（N20）、一氧化氮（NO）和二氧化碳（CO：、及反硝化终产物N：的排放。采用氦环境培养一气体同步直接测定法，在不同土壤温度（50c和200C）和不同土壤含氧量（10％和20％）条件下，关注不同放牧处理土壤N2、N2O、NO和CO2排放。结果显示：不同放牧处理土壤N：、N2O、NO和COz排放速率分别为0．3-2．0ggN／（h·kg）、0．02-0．4ggN／（h·kg）、0．08-0．7ggN／（h．kg）和O．01-1．9mgC／（h·kg），N2排放为N2O的8-17倍。由于较大的空间变异性，并未观测到不同放牧处理对土壤N2、N2O、NO和C02排放的影响。土壤温度升高和湿度增加能促进N2、N20、NO和CO。的排放，而土壤O2含量对其排放的影响不显著。To get better know the emissions of greenhouse gases （N20）, nitric oxide （NO） and carbon dioxide （CO2） and the end product of denitrification, N2 in the typical grassland of Inner Mongolia, a gas-flow-soil-core technique with the helium-environment incubation system was used to measure these emissions from two grazing treatments. Two soil temperature （5℃ and 20℃） and two levels of soil oxygen content （10% and 20%） were set for our laboratory experiment. The results showed that emission rates of N2, N20, NO and CO2 were in the range of 0.3-2.0 p,g N/（h-kg）, 0.02-0.4 μg N/（h.kg）, 0.08-0.7μg N/（h.kg） and 0.01-1.9 rag C/（h.kg）, respectively. The N2 emissions were 8-17 times as high as N20 emissions. Due to the higher spatial variability, no significant differences of N2, N20, NO and COs emissions and two temperature and soil water content had a positive effect on N2, N20 and content had no effect on their emissions. grazing treatments were detected. Soil NO emissions, whereas the soil oxygen

关 键 词：N2 N2O NO 放牧 土壤含氧量 

分 类 号：S-3[农业科学]