森林能对温度起调节作用,缩小和缓和林内和防护林网内的温度变化。在农田林网内,夏季可降低气温1—4℃,冬季可增高气温1—2℃。森林能降低风速,在树高的20—25倍范围内,乎均降低风速30％左右。随着风速的减弱及森林对光照、温度的影响,使林网内的水分蒸发量约减少17—38％,空气相对湿度提高10— Forests can act as a regulator of temperature, reducing and mitigating temperature changes within the forest and shelterbelts. In farmland forest network, the temperature can be reduced in summer 1-4 ℃, the winter can increase the temperature 1-2 ℃. The forest can reduce the wind speed, in the range of 20-25 times the tree height, almost reduce the wind speed by about 30%. With the decrease of wind speed and the impact of forest on light and temperature, the water evaporation in forest network is reduced by about 17-38% and the relative humidity of air is increased by 10-