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据测定 ,1株 5 0年生的核桃树 ,树高 1 5 m,冠厚 1 0 m,冠幅 30 m2 ,一天可蒸腾水汽 1 0 0～ 1 5 0 kg,树上空气相对湿度提高 1 5 % ,树下土壤水分蒸发量减少 1 3% ,土壤含水率提高 5 .5 % ,林间气温降低 1 .5～ 3.6% ,夏天有叶能降尘 44.7% ,冬天叶落能降尘 2 6% ,核桃叶含胡
It has been determined that a 50-year-old walnut tree has a tree height of 15 m, a crown thickness of 10 m and a crown width of 30 m2. The day-to-day transpirational water vapor is 100 to 150 kg, and the relative humidity of the tree air is increased by 15 %, The amount of soil water evaporation under the tree decreased by 13%, the soil water content increased by 5.5%, the temperature in the forest decreased by 1.5-6.6%, the summer leaves could reduce the dust by 44.7%, the winter leaves could reduce the dust by 26% Walnut leaves with Hu