青藏高原高寒灌丛生态系统CO2通量年变化特征研究

高寒灌丛生态系统是广布于青藏高原的高寒草甸植被类型,它是青藏高原大气与地面之间生物地球化学循环的重要构成部分,在区域生态系统碳平衡中起着极为重要的作用。采用涡度相关法对青藏高原高寒灌丛CO₂通量进行连续观测(2003年1月1日至2005年12月31日),结果表明:2003,2004和2005年高寒灌丛年净生态系统CO₂交换量分别为223,277和61g CO₂·m^-2·a^-1,3年平均CO₂值为187g CO₂·m^-2·a^-1;与其他地区草地生态系统类型相比,在为期3年的研究时段海北地区高寒灌丛生态系统表现为大气CO₂的汇。

Annual Carbon Dioxide Flux Variations of Alpine Shrub Ecosystem in the Qinghai-Tibet Plateau

Alpine shrub ecosystem is an alpine meadow vegetation type widely distributed in the Qinghai-Tibet Plateau.It is a crucial component of biogeochemical cycles between the atmosphere and surface playing an important role of ecosystem carbon balance.Continuous CO₂ flux observation using the eddy covariance method in the alpine shrub of Qinghai-Tibet Plateau indicates that the alpine shrub ecosystem was a weak sink for atmospheric CO₂ with a net ecosystem CO₂ exchange(NEE) capacity of 223,277 and 61 g CO₂·m^-2·a^-1 from 2003 to 2005,respectively.Compared to other grassland ecosystems types,the alpine shrub ecosystem of Haibei area can play a role in atmospheric CO₂ sinks during the tested period.