Response Of Soil Respiration To Precipitation And Litter Changes In Broad-leaved Forest Of Jinyun Mountain

Global warming not only affects the quality and quantity of forest litter,but also affects precipitation and precipitation patterns.Precipitation is an important source of soil moisture.Land surface litter is an important source of soil organic carbon.Both are important for the carbon cycle of terrestrial ecosystems.In order to study the influence of precipitation and litter changes on soil respiration in the subtropical monsoon climatic region,this study focused on the evergreen broad-leaved forest in Jinyun Mountain of Chongqing,and explored the effects of soil respiration on different precipitation and litterfalls by artificially concealing rain and increasing precipitation..The response includes 8 different treatments:Conserving litter and zero precipitation(CZ),Conserving litter and natural precipitation(CK),Conserving and adding precipitation 70%(70%CP),and Conserving litter and adding precipitation 100%(100%CP),Deleting litter and zero precipitation(DZ),Deleting litter and natural precipitation(DP),Deleting litter and adding precipitation 70%(DP),and Deleting litter and adding precipitation 100%(DP).The main findings are as follows:(1)The soil respiration rates of different precipitation and litter treatments showed obvious diurnal dynamics.They all showed a single peak curve.The maximum value appeared at 14:00,which was consistent with the daily dynamics of soil temperature.This explains that temperature is the main factor affecting soil respiration;(2)The single factor model was the best in control.Reducing water,adding precipitation and deleting litter will reduce the correlation between soil respiration and soil temperature,and the temperature sensitivity changes are consistent with it;(3)Compared with single-factor model,the two-factor model improves the fitting degree,indicating that soil temperature and moisture affect soil respiration in the same time;(4)When water is added at 70%,the contribution rate of precipitation and litter is the largest,and the interaction between precipitation and litter is the best.