长白山阔叶红松林空气N_2O浓度的垂直分布特征

Vertical Distribution of Nitrous Oxide within Broad-leaved Korean Pine Forests in Changbai Mountain

在原始阔叶红松林测定空气N2 O的垂直分布 ,三次观测结果发现林冠高度处N2 O浓度比树干和林冠上方的背景值高 5 4 3% -74 % ,差异极显著。林冠外出现高浓度 ,树干处低浓度 ,表明N2 O是从林冠排放到周围空气中的。因此 ,本研究提供了植物在自然状态下能排放N2 O的证据 ,从而证明了森林生态系统中植物本身也是大气N2 O的排放源。

The vertical distribution of N 2O concentration are measured within the primary Korean pine forests.Results of three observations show that N 2O concentration at the canopy height is 5.43%-74% higher than the normal concentrations at trunk space heights and above canopy heights.Difference between the high concentrations and normal concentrations is statistically significant.The high concentrations at the canopy height and the normal ones at trunk space height indicates an efflux of N 2O from canopy to atmosphere.The study proves that plants are a discharge source of N 2O in the forest ecosystem.