Effects Of Warming,Rodents,and Grazing On Dynamic Changes Of Soil Respiration In Alpine Wetlands

Soil respiration is an important approach to the carbon budget of terrestrial ecosystems,and it plays an important role in the global carbon cycle.Experimental plots were selected in the Tibetan Plateau region,which is very sensitive to global climate change response.In the growing season of 2016-2017,the soil respiration rate,soil temperature,and volumetric water content of swamp meadows on the Tibetan Plateau were measured.Explore the effects of simulated warming?W?,rodent damage?SH?,and grazing conditions?FM?on soil respiration.The results are as follows:1.The daily variation of soil respiration rate under natural conditions,simulated warming,rodent damage,and grazing conditions showed a single-peak curve or a double-peak curve.Most of the peaks under natural conditions and warming conditions occur between 14:00-16:00,and peaks under rodent impact and grazing conditions mostly occur at 12:00-16:00.The monthly variation trend shows a single peak curve.The highest values of natural conditions,simulated warming,and rodent damage all occurred in August,and the highest values under grazing conditions occurred in July.2.Simulated warming,rodent damage,and grazing conditions all increase soil respiration rates.The average soil respiration rate under the influence of simulated warming and rodent damage during the growing season was 1.38 and 1.5 times that of the natural state,and both were significantly different from the natural state?p<0.01?.And there was no significant difference between grazing conditions and natural conditions.3.Compared with the natural state,the simulated temperature increase,rodent damage,and grazing conditions have increased soil respiration rate interpretation and correlation coefficient.And the volume of soil water content under the influence of rodent damage on the interpretation of the soil respiration rate and the correlation coefficient are reduced.The Q₁₀0 of the warming condition is lower than the natural state.The Q₁₀0 under the influence of rodent damage and grazing conditions is higher than the natural state.Rodents damage and grazing conditions are more conducive to promoting soil carbon release.