青海湖高寒湿地生态系统生长季CH4通量

利用涡度相关法研究青海湖高寒湿地生态系统2015-2016年生长季CH₄通量。结果显示：生长季CH₄通量表现为白天排放、夜间微弱吸收或排放的日变化特征，其中2015年CH₄通量日平均值为56.67 mg·m^-2，2016年CH₄通量日平均值为35.92 mg·m^-2。7月和8月排放量最大，生长季前期和后期排放较弱，2015年最大排放量出现在7月，为3.76 g·m^-2，2016最大排放量出现在8月，为1.67 g·m^-2。温度、电导率、土壤体积含水量与CH₄通量显著相关，气温和CH₄通量线性正相关。生态系统总初级生产力和呼吸及水热通量与CH₄通量也存在显著的相关关系，其中生态系统总初级生产力和呼吸是影响甲烷动态变化的主要因子。

CH4 Flux Characteristics of Qinghai Lake Alpine Wetland Ecosystem during Growing Season

Taking the Qinghai Lake alpine wetland ecosystem as the research object, the CH₄ flux of 2015 and 2016 years was studied using the eddy covariance method. Results show that the average diurnal variation of CH₄ emission in the daytime and weakly absorbed or emissioned at night, with daily average value was 56.67 mg·m^-2 in 2015, and the value was 35.92 mg·m^-2 in 2016. July and August of the growing season wre the largest monthly emissions, while emissions were weaker in the early and late growth season. The maximum monthly emission in 2015 was in July, with a value of 3.76 g·m^-2, 2016 the maximum monthly emission occurred in August with a value of 1.67 g·m^-2. There was a significant correlation between temperature, soil conductivity, soil volume water content and CH₄ flux, among them the air temperature is liningly related to CH₄ flux. There was also a significant correlation between total primary productivity, respiration, hydrothermal flux and CH₄ flux, and the primary productivity and respiration of ecosystems were the main factors affecting the dynamic change of methane.