Influences Of Fertilizer, Irrigation And Fire On Greenhouse Gas Flux In A Desert Steppe

Greenhouse gas emission and uptake by steppe soils has an influence on agricultural greenhouse effect and global warming. Here, we investigated influences of fertilizer(organic fertilizer, inorganic fertilizer, mixed fertilizer), irrigation and fire on soil-atmosphere greenhouse gas flux and change trend during the growing season by used the closed static chamber method on desert steppe of Inner Mongolia in2012. The results were shown as follows:1. All treatments reduced the CH4uptake, but they were all not reached significant level (P>0.05).The same change trends of CH4uptake were observed in the different treatments.2. All treatments increased the CO2emission, only the fire treatment reached a significant level (P<0.05). The same change trends of CO2emission were observed in the different treatments.3. CH4uptake was a positive correlation with soil temperature and negative correlation with soil moisture.4. CO2emission was a positive correlation with soil temperature and moisture.