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通过水面蒸发观测资料分析，提出林网内相对蒸发变化可用分段曲线拟合，分为对数区与二次曲线区两部分．对数区相对蒸发变化服从对数规律ＥＡ／Ｅ０＝ａ１＋ｂ１ｌｎｈ，二次曲线区相对蒸发变化服从二次曲线规律Ｅｈ／Ｅ０＝ａ２ｈ２十ｂ２ｈ＋ｃ．在蒸发水平分布特征研究基础上，对林网内平均相对蒸发强度进行了估算，并讨论了保水性能最佳防护林带距间题．
Based on the observation data analysis of water surface evaporation, it is suggested that the relative evaporation in the forest network can be fitted with piecewise curve fitting, which is divided into two parts: the logarithmic zone and the quadratic curve zone. The logarithmic law of relative evaporation obeys the law of logarithm EA / E0 = a1 + b1lnh, and the relative evaporation in the quadratic curve obeys the law of quadratic curve Eh / E0 = a2h2 + b2h + c. Based on the study of the evaporation distribution characteristics, the average relative evaporation intensity in the forest network was estimated, and the optimal shelterbelts with water retention capacity were discussed.