Greenhouse gases emission or uptake in Inner Mongolia natural and free-grazing grasslands
内蒙古天然与放牧草原温室气体排放研究

GC MS was used to measure the greenhouse emission of Inner Mongolia Grassland. The results showed that four kinds of typical semi arid grasslands in Inner Mongolia had their own special seasonal patterns as the source of atmospheric N 2O and CO 2 emission and the sink of atmopsheric CH 4,which were controlled by seasonal weather variation. Different soil and vegetation types and precipitation influenced the intensity of emission and upatake of the gases. Compared with natural grassland,free grazing decreased CH 4 uptake and N 2O emission,but increased CO 2 emission.