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阳光照射于森林,经林冠反射和阻留,到达林地的阳光数量只有空旷地的5—40％,并使得林冠下的直射光少,而散射光多。散射光中,有利于林木光合作用的红黄光波数量大为减少,而对光合作用不大的绿光却相对增多。据有关资料介绍,林内散射光含有利植物生长发育的生理辐射量只有空旷地的1/5。林内某一固定点上的光照时间,只有空旷地的一半。总之,林下的阳光是数量少,直射光少,散射光多,含生理辐射少,光照时间短。处在这样
Sunlight shines on the forest, which reflects and blocks the canopy. The amount of sunshine reaching the woodland is only 5-40% of the open area, resulting in less direct light under the canopy and more scattered light. Among the scattered light, the number of red and yellow light waves that are good for photosynthesis of trees is greatly reduced, while the green light, which has little photosynthesis, is relatively increased. According to the information introduced, the forest scattered light contains the growth and development of plants, the physiological radiation is only open to 1/5. The lighting time at a fixed point in the forest is only half of the open area. In short, the sun is a small number of forest, less direct light, scattered light, with less physiological radiation, light time is short. In this way