付老文泡湿地贴地气层中CO_2日平均浓度沿环境梯度的空间分异特征

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。

Spatial Variability of Daily Mean Concentrations of CO_2 along an Environmental Gradient in Ambient Atmosphere above the Fulaowenpao Wetland

Six study plots were selected from lowland to upland in the typical monitoring transeet of the Fulaowenpao wetland in order to study the spatial variability of daily mean concentrations of CO_2 in ambient atmosphere above wetlands along the environment gradients. Results showed that there were low daily mean eoneentrations of CO_2 in ambient atmosphere above the Fulaowenpao wetland in July, with the general mean concentration of 264.14 μmol/ mol. The daily mean coneentration of CO_2 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 CO_2 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 CO_2 followed the order of Sitel