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从1999年8至10月,2000年的4至6月,2002年8月至2003年9月,在平均树高为26米的长白山阔叶红松林内,用红外气体分析仪(2250D,LI-CORInc.和LI-COR,820)测定了不同高度的二氧化碳浓度。根据测定的数据,分析了阔叶红松林二氧化碳廓线的日变化和季节变化动态。结果表明:CO2浓度的垂直分布在白天和夜间是不同的,在接近地面处CO2浓度始终最大。从季节CO2廓线看出,在植物生长季节林冠处CO2浓度有明显的成层现象,不同高度(60~2.5m)的CO2浓度3月份变化较小差值为10mmol穖ol-1,而在7月份变化较大,差值为60mmol穖ol-1。7月份林冠处(22,26,32m)CO2浓度梯度较大,浓度差为8mmol穖ol-1。计算位于涡度相关仪器之下的40米高空气柱中CO2贮存状况表明,年际贮存是负值,但对NEE的贡献很小。图4参11。
From August to October in 1999, April to June in 2000, August 2002 to September 2003, in the broad-leaved Korean pine forest in Changbai Mountains with an average tree height of 26 meters, an infrared gas analyzer (2250D, LI -CORInc., And LI-COR, 820) measured carbon dioxide concentrations at different heights. According to the measured data, the diurnal variation and seasonal variation of the CO2 profile of the broad-leaved Korean pine forest were analyzed. The results show that the vertical distribution of CO2 concentration is different between day and night, and the CO2 concentration is always the maximum near the ground. From the seasonal CO2 profiles, there was a clear stratification of CO2 concentration in the canopy during the plant growing season. The difference of CO2 concentration at different altitudes (60 ~ 2.5m) in March was 10 mmol 穖 ol-1, July changes greatly, the difference is 60mmol 穖 ol-1.7 month beam (22,26,32m) CO2 concentration gradient, the concentration difference is 8mmol 穖 ol-1. Calculating the CO2 storage in a 40 meter high air column below the vorticity related instrument indicates that the interannual storage is negative but contributes little to NEE. Figure 4 Senate 11.