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森林可以防风固沙、改变小气候。在距林带相当于树高2倍远的背风范围内,风速可降低为50～70％。有林地比无林地的相对湿度高5～20％。年降雨量可增加10～26％。护田林网还可使农田冬季增温,夏季降温,防
The forest can wind sand, change the microclimate. The wind speed can be reduced to 50-70% at a lee range of 2 times the tree height above the forest level. Woodland has 5 ~ 20% higher relative humidity than non-woodland. Annual rainfall can increase 10 ~ 26%. Tian Tian Lin network also allows winter warming farm, summer cooling, anti