The Simulation Experiment Of Soil Temperature And Watercontent Affect Forest Soil Greenhouse Gas Fluxes

The forest soil is an important greenhouse gas sources and sinks. In this study, undisturbed soil of3kinds Woodland were adjusted respectively to be0.08kgkg-1,0.16kgkg-1,0.24kgkg-1,(respectively20%,40%,60%of the maximum field capacity).The undisturbed soil were cultivated in3same types artificial climate incubator (temperature respectively were5℃,10℃and15℃)cultured for30days.To analyze the soil organicarbon,nitrate,ammonium nitrogen content for different treatment befor and after the culture.at the same time observed the effects of different temperature and moisture on3kinds of greenhouse gases(CO2、N2O、CH4)emission fluxes.The results showed:The three kinds forest soil organic carbon mineralization rates were correlation exponentially with temperature under different treatment.and the change was influenced by soil water content. The three kinds forest.At the same temperature,the sensitivity of the three forest on the soil water content was inconsistent. The three woodland netnitrification rates and nitrogen mineralization rates were secondary binary linear relationship with temperature and soil water content.On the conditions of normal water content (0.16kgkg-1),coniferous forest soil respiration was the the most sensitive to the temperature. Coniferous forest and mixed forest soil N2O emission rate increased with increasing temperature,the broad-leaved emission rate exponential relations with temperature was not significant.Three kinds of soil N2O emissions increased with soil water content was not significant.Three forest soil all the sink of CH4,Under the same conditions the broad-leaf woodland CH4uptake flux was the maximum.