摘要
以付老文泡湿地为研究区,在典型样带内设置具有不同环境梯度的六个观测区,研究了样带内贴地气层CO2日平均浓度的空间分异特征。结果表明,付老文泡湿地在7月份的贴地气层CO2日平均浓度较低,总平均值为264.14μmol/mol;付老文泡湿地最大CO2日平均浓度出现在近地面层,CO2日平均浓度由近地面层向上呈现下降趋势。在四个高度水平上,CO2日平均浓度的水平分异特征明显,高值区和低值区分别出现在洼地和高地。在水分梯度作用下,洼地区内CO2日平均浓度在四个高度水平上均表现为样地A<样地B<样地C,且在垂直方向上均呈现出由近地层向上呈先减后增再骤然减少的变化趋势;样地D和样地E的CO2日平均浓度在垂直方向上变化趋势一致,由近地层向上呈现逐渐减少的变化趋势;而样地F的CO2日平均浓度的垂直变化不明显。
Six study plots were selected from lowland to upland in the typical monitoring transect of the Fulaowenpao wetland in order to study the spatial variability of daily mean concentrations of CO2 in ambient atmosphere above wetlands along the environment gradients.Results showed that there were low daily mean concentrations of CO2 in ambient atmosphere above the Fulaowenpao wetland in July,with the general mean concentration of 264.14 μmol/mol.The daily mean concentration of CO2 reached the maximum at the height of 0.1 m,and showed a decrease with increasing altitude.There was obvious spatial variability of daily mean concentrations of CO2 at the four altitudes in horizontal direction,and the higher and lower concentration areas appeared in lowlands and uplands,respectively.The daily mean concentrations of CO2 followed the order of Site1〈Site 2〈Site 3 along the humid gradients in lowland areas and they showed a slight increase after decreasing and then a sharp decrease in a vertical direction.Site 4 had the same daily mean concentrations of CO2 as Site 5,showing a gradual decrease with increasing altitude.However,as for Site 6,no obvious change for daily mean concentrations of CO2 could be observed and the concentration nearly kept constant.
出处
《地球与环境》
CAS
CSCD
北大核心
2009年第4期342-346,共5页
Earth and Environment
基金
国家自然科学基金项目(40701003
50879005)
国家重点基础研究发展(973)计划项目(2006CB403301)
关键词
环境梯度
CO2日平均浓度
湿地贴地气层
空间变异
environment gradient
daily mean concentrations of CO2
ambient atmosphere above wetland
spatial variability
