固沙林水分平衡与植被建设可适度探讨

Water Balance of Dune Fixation Forest and Suitability of Artificial Vegetation

该文分析了固沙林水分平衡和自然植被的特征，提出植被建设应遵守的原则和固沙林适宜的密度．在干旱、半干旱和亚湿润干旱区，环境对植被的支持力比较低，固沙林密度偏大就会引起土壤水分亏缺，导致土壤水分贮量减少和地下水位下降；建设人工植被应遵守植被分布的地带性和非地带性规律；根据地区内环境空间异质性和多样性，参照自然植被的空间结构确定人工植被的空间结构；固沙林应为“疏林”，密度宜低不宜高．

This paper describes water balance of dune fixation forest and its suitable density,and gives the feature of natural vegetation and the basic principle to construct artificial vegetation.High stand density of dune fixation forest leads to deficiency of soil water,decrease of soil water storage and decline of water table due to low vegetation support capacity of environment in the arid,semi arid and sub humid arid regions.Distribution patterns of zonal and azonal vegetation and spatial heterogeneity of the environment should be considered in development of artificial vegetation.The dune fixation forest should be “open” stand,its density should be lower.