The Impact Of Temperature And Moisture Content On Soil Respiration Of Different Plant Community In The Qinghai Lake Wetland

It is closely related to Soil respiration and global change, which is the part of thestudy on the global carbon cycle can’t be ignored. As well as the ecosystem of theQinghai-Tibet Plateau are highly sensitive to climate change. In this paper, it makesthe alpine plant communities in soil respiration as the research object. We measuredsoil respiration in Achnatherum splendens, Achnatherum splendens+IrisensataThunb, IrisensataThunb, Blysmus sinocompressus Tang et Wang, Carextristachya （platform） and Carex tristachya （Under water） communities in the2011growing seasons using an automated CO2efflux system （li-8100A） and analysis of thetemperature and humidity on the influence of soil respiration rate. The results showedthat the diurnal variation of soil respiration rate was the basic symmetric single-peakcurve, the highest values found in the afternoon between noon and half. It wasbasically the same between seasonal changes and temperature. The highest value wasin summer （August） and the lowest was in winter （December）. The highest value ofsoil respiration rate were10.55umol·.m^-2·s^-1、14.27umol·.m^-2·s^-1、15.59umol·.m^-2·s^-1、5.93umol·.m^-2·s^-1、6.13umol·.m^-2·s^-1和6.99umol·.m^-2·s^-1in growing season. Carextristachya （Under water） community the temperature sensitivity of soil respiration（Q10） was the largest of Carex tristachya （Under water） community; basal respirationrate was the largest of Achnatherum splendens+IrisensataThunb community.Communities in six kinds of soil respiration and soil surface temperature were anexponential model, except the Carex （Under water） community, and the soilrespiration rate increased with soil surface temperature; Removed the influence oftemperature, the Achnatherum splendens, IrisensataThunb, Blysmussinocompressus Tang et Wang and Carex tristachya （platform） communities, soilrespiration rate and soil moisture were took on exponential model, the Achnatherumsplendens+IrisensataThunb, Carex tristachya （Under water） communities weretook on binomial model; except Carex tristachya （Under water） community, soiltemperature and humidity of binary linear equations can explain the community mostof the time variation, as for all communities, the variation explained by the amount of51%.