生长在干旱地区的树种,对不良的生态环境有较强的适应性,适应性的强弱又因树种而异。自然界影响树木生长的环境因子很多,本文仅选择其中对梭梭 (Haloxylem ammoden-dron)、沙拐枣(Calligonum mongolicum)、踏郎(Hedysarum mongolicum)和花棒(H.scopa-rium)影响最大的立地因子进行分析。结合这些树种的生长状况来探讨它们的适宜生境。一、调查区概况调查地设在内蒙古磴口实验局一场。林地为半固定沙丘和覆沙丘间地。沙丘高2-3米,地下水位2-6米。主要伴生植物有白茨、沙蒿、沙竹和沙米等。该地气候干燥多风,年平均降水量142毫 Tree species that grow in arid regions have strong adaptability to bad ecological environment, and their adaptability varies with tree species. There are many environmental factors that affect the growth of trees in nature. In this paper, only the most influential factors on Haloxylem ammoden-dron, Calligonum mongolicum, Hedysarum mongolicum and H.scopa-rium Site factor analysis. The suitable habitats of these species are discussed based on their growth status. First, the survey area survey site located in Inner Mongolia, a test port. The woodland is semi-fixed dunes and sand dunes. Dunes 2-3 meters high, groundwater level 2-6 meters. The main associated plants are white, Artemisia, sand and Shami rice. The climate is dry and windy, with an average annual rainfall of 142 milliliters