油松人工林林冠层的水文作用

油松人工林林冠截留量占林外降水量的19.76％,林内外降水量为直线关系,林冠截留量与林外降水量为幂函数关系。林下降水分布不均,距树干越远,降水量越大;林内雨滴不连续,大雨滴增多,动能增大。油松林冠层年蒸腾强度以6月份最大,日蒸腾强度,以14时最高,年均蒸腾强度为0.25g/(g·h)。

Hdrological Effect of Crown Cover of Artificial Chinese Pine Forest

The interception of rainfall of crown cover of artificial Chinese pine forest amounts to 19. 8 per cent. The rainfall inside the forest has a linear relation with that outside the forest. Rainfall intercepted by crown cover may be related to the rainfall outside the forest by an exponential function. The rainfall under the forest is unevenly distributed, the farther it aparts from the trunk, the larger is the rainfall. The raindrop inside the forest is not continuous, large raindrop grows in number and hence the kenetic energy increases. The intensity of transpiration of crown cover of Chinese pine forest in June is the largest in a year and that at 2 o' clock in the afternoon is highest in a day. The average annual intensity of transpiration is 0. 25 g/ (g ?h).