摘要
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CH_4通量。结果显示:生长季CH_4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CH_4通量日平均值为56.67 mg·m^(-2),2016年CH_4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CH_4通量显著相关,气温和CH_4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CH_4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。
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 var- iation 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, sotl 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.
作者
吴方涛
曹生奎
曹广超
汉光昭
林阳阳
成淑艳
Wu Fangtao;Cao Shengkui;Cao Guangchao;Han Guangzhaoa;Lin Yangyanga;Cheng Shuyana(College of Life and Geography Sciences;Qinghai Province Key Laboratory of Physical Geography and Environmental Process,Qinghai Normal University,Xining 810008,China)
出处
《中国沙漠》
CSCD
北大核心
2018年第5期1078-1085,共8页
Journal of Desert Research
基金
国家自然科学基金项目(31260130)
中国科学院"西部之光"人才计划项目(科发人教字[2012]179号)
中国博士后基金项目(2013M542400)
教育部科学技术重点研究项目
青海省重点实验室平台建设项目(2014-Z-Y24
2015-Z-Y01)
关键词
青海湖
高寒湿地
甲烷通量
涡度相关
Qinghai Lake
alpine wetland
methane flux
eddy covariance
