【摘要】 利用玉树隆宝湿地2015年的涡动相关系统观测资料,分析了高寒湿地CO₂通量的变化特征及影响因子。结果表明:玉树隆宝湿地生长季CO₂通量日变化呈倒单峰型,夏季日变化幅度大,冬季日变化幅度小。4-9月CO₂净交换量为负值,其余各月CO₂净交换量为正值。全年CO₂净吸收量为465 g·m^-2。白天CO₂通量随着光合有效辐射的增大而减小。CO₂排放量与土壤温度和气温日较差均呈正相关。高寒湿地土壤体积含水量对CO₂通量的影响很微弱。降雨事件发生后,CO₂排放量在短期内有所升高。各影响因子中,光合有效辐射对高寒湿地CO₂通量影响的相关度最高,其次为气温日较差,土壤温度,而土壤体积含水量对CO₂通量影响的相关度最低。更多还原

【Abstract】 Using the data observed by eddy-covariance flux in Longbao wetland,Yushu,in 2015,characteristics of CO₂ flux and its control factors were analyzed. The results show that daily change of CO₂ flux in Longbao wetland was inverted unimodal and was negative in daylight and positive at night. Daily range of CO₂ flux was maximum in July and minimum in January. From April to September there was a carbon sink in the alpine wetland ecosystem and a carbon source in other months. Annual CO₂ net absorption was 465 g·m^-2. CO₂ flux decreased with photosynthetically active radiation increase in daylight. CO₂ emission was positively correlated with soil temperature and daily rangeability of air temperature. Alpine wetland soil moisture effected on CO₂ flux very weak. CO₂ emission increased in short order after rain event. CO₂ flux strongly correlated with photosynthetically active radiation,following by daily rangeability of air temperature and soil temperature. CO₂ flux weakly correlated with soil moisture.更多还原