森林是陆地上最大的生态系统,它保持着生物圈的活力和稳定,并在改变生物圈方面起着主导的作用.森林除能治理山河,美化环境,净化空气,吸滞烟尘,减弱噪音外,还可调温、增湿、保水、防风、防灾。1.调温效应。白天,当阳光照射到森林树冠时,约有35%的热量被树冠所吸收,20—25%的热量由树冠反射回天空,使到达林内的太阳辐射热量大为减少.同时,森林 Forests, the largest ecosystem on land, maintain the viability and stability of the biosphere and play a leading role in altering the biosphere. Forests, in addition to managing mountains and rivers, beautifying the environment, purifying the air, soot absorbing dust, and reducing noise Adjustable temperature, humidification, water, wind, disaster prevention. 1. Thermostat effect. During the day, when sunlight reaches the canopy of the forest, about 35% of the heat is absorbed by the canopy and 20-25% of the heat is reflected back into the sky by the canopy, greatly reducing the amount of solar radiation reaching the forest. At the same time,