本文以中国西北荒漠地区50种荒漠植物作为定量研究的对象，根据层次分析法(Ana lytical Hierarchy Process，简称AHP)理论，选取珍稀濒危荒漠植物的分布区、分类学地 位、生物学指标及利用价值4个指标，将生物学指标量化为乔木、灌木、多年生草本和1年 生草本4个指标变量；将利用价值量化为科研、药用、饲(食)用、薪炭用和其它价值5个指 标变量，分别构建判断矩阵，通过计算机数据处理，定量研究各指标在珍稀濒危等级综合评 价中的权重及重要程度.研究结果表明：对50种珍稀濒危荒漠植物的保护等级进行排序，结 论基本符合《中国珍稀濒危保护植物名录》和《中国植物红皮书》的分级结果。盐桦(Bet ula holophila）、矮沙冬青(Ammopiptanthus nanus）、贺兰山丁香(Syringa pinnatifoli a var. alashanica）、沙生柽柳(Tamarix taklamakanensis）、四合木(Tetraena mog olic a)、新疆丽豆（Colophaca soongoria）、喀什女蒿(Hippolytia kaschgarica)7种荒漠植 物被列为1级保护，占总数的14％；裸果木等22种荒漠植物被列为2级保护，占总数的44％； 梭梭等19种荒漠植物被列为3级保护，占总数的38％；星毛短舌菊、盐豆木2种荒漠植物被列 为等外，占总数的4％。%In this paper, 50 species of desert plant in north west area of China w ere studied. Applying to the Analytical Hierarchy Process (AHP) method, we const ructed the synthetic assessment system conservation grading of Chinese rare and endangered desert plants. In this system, there are 4 assessment indexes： B1： Distribution, B2： Taxonomic position, B3：Biological index, B4：Available va lue. The weight of each index is gotten through judged matrix according to AHP. The asse ssing value of distributive index and taxonomic index are based on each species distribution area and taxonomic position. The biological index assessing value i s embodied from each species' belonging： tree, shrub, perennial herb or annual h erb. There are 4 index variables to stand for available index assessing value, t hey are drug value, forage and edible avail, fuel avail and other avail. The qua ntitative study results indicate： 50 species of desert plants are divided into 4 conservation grading. The species belonging in the first conservation grading a re Betula holophila, Ammopiptanthus nanus, Syringa pinnatifolia var. alash anica, Tamarix taklamakanensis, Tetraena mongolica, Colophaca soongoria and Hippolytia kaschgarica, occupying 14% of all 50 species; Gymnocarpos przewalskii and other 21 species are listed in second conservation grading, occupying 44% of th e total; Holoxylon ammodendendron and other 18 species are listed in third c onservation grading, occupying 38% of the total; Brachanthemum pulrinatum an d Halimodendron halodendron are out of grading.
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