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中文摘要：
采用对数正态分布模型，基于2006年黑河下游的野外实测数据，建立了研究区胡杨和柽柳植被盖度与地下水埋深的模型，并模拟了研究区的潜在植被．结果表明：黑河下游胡杨的最适宜地下水位和平均地下水位分别为2．6和3．6m，柽柳则分别为2．0和3．0m；胡杨的高盖度分布区主要集中在河道两侧的区域，而柽柳则可以在研究区的大部分区域以较高的盖度生存，对于研究区当前的地下水埋深而言，柽柳应该是最适宜生存的物种之一；研究区胡杨和柽柳的潜在植被空间分布与现状分布的相似性分别为43．4％和55．6％，导致相似程度不高的主要原因为土壤中存在的石膏盐盘层阻碍了土壤水分的垂直运动．
英文摘要：
Based on the 2006 investigation data in lower reaches of Heihe River, and by using loga- rithmic normal distribution model, the models about the vegetation cover of Populus euphratica and Tamarix ramossima and the groundwater level in study area were built, and the potential plant of the study area was simulated. The results showed that in the lower reaches of Heihe River, the optimal groundwater level and mean groundwater level for P. euphratica were 2.6 m and 3.6 m, and those for T. ramossima were 2.0 m and 3.0 m, respectively. The high cover P. euphratica distribution area was mainly concentrated in the near-banks of Donghe River and Xihe River, while higher cover T. ramossima was distributed in most parts of the study area. From the aspect of current groundwater level, T. ramossima should be the adaptive species in the study area. The similarities between the potential and actual spatial distribution of P. euphratica and T. ramossima were 43.4% and 55.6%, respectively, and the main reason for the lower similarity was that there existed a gypsum salt pan in soil, which blocked the vertical movement of soil water.
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