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以微气候观测为基础,研究晴天状况下海北高寒草甸地区净辐射通量、土壤热通量、感热通量和潜热通量变化等特征。结果表明:(1)该地区总辐射的水平较高,2000年4～10月达4227.049W·m-2,地表反射率在4～10月平均为0.23,在植物生长盛期的5～9月为0.22。(2)正向净辐射约占天空总辐射的56%左右;一日间土壤热通量、感热通量和潜热通量所占净辐射通量的比例在不同季节变化差异较大,在所选择的6月到9月的4个晴天个例状况平均分别所占的比例为28.6%、68.0%和3.4%,表现出潜热通量在净辐射能量的分配中所占比例较大,感热通量次之,土壤热通量则很小。(3)各通量所通过零点的时间基本一致,一般在日出后的7∶00和日落前的19∶00。
Based on the microclimate observations, the net radiant flux, soil heat flux, sensible heat flux and latent heat flux in the northern alpine meadow area under sunny conditions were studied. The results showed that: (1) The total level of radiation in this area was high, reaching 4227.049W · m-2 in April-October 2000, and the average surface reflectance was 0.23 in April-October. During the peak period of plant growth, The month is 0.22. (2) The positive net radiation accounts for about 56% of the total solar radiation. The ratio of net heat flux, sensible heat flux and latent heat flux in different days varies greatly in different seasons, The average number of cases in each of the four sunny days selected from June to September was 28.6%, 68.0% and 3.4%, respectively, indicating that the latent heat flux accounts for a large proportion of net radiant energy distribution Followed by heat flux, soil heat flux is very small. (3) The zero time passes through each flux basically the same, usually after sunrise at 7:00 and sunset before 19:00.