为了评价不同喀斯特苗木的抗旱能力，并建立一个简便、适用的林木抗旱评价指标体系，笔者利用水力结构理论，研究苗木的水势、水力结构、保水力和苗木耗水量等一系列相关参数，探讨苗木的吸水潜能、水分运输与分配效率、保水能力和耗水强度等4个方面的差异，并综合评价不同苗木的抗旱能力，并比较了“隶属函数法”和“多维空间坐标综合评定值累加法”2种不同的苗木抗旱性评价方法。结果表明：应用隶属函数累加法对6种树种苗木的综合抗旱性进行评价，研究结果为：香樟>滇柏>侧柏>刺槐>构树>杜英。且不同树种苗木不同水分运转过程对树种抗旱性的贡献率不同；应用多维空间坐标综合评定法对6种苗木抗旱性的综合评价，其结果为：刺槐>侧柏>香樟>构树>滇柏>杜英。在被评价树种数量较少的情况下，采用多维坐标综合评价法适用性更好。

In order to evaluate drought resistant ability of different seedlings in karst area and to establish a simple and applicable index system of drought resistance identification, seedlings water potential, hydraulic architecture, water retaining capacity and intensity of water consuming had been studied by hydraulic architecture theory and the author further discussed the difference of seedlings in potential of water absorption, efficiency of water transportation and distribution, water retaining capacity and intensity of water consuming. Furthermore, drought resistance of different seedlings was comprehensive evaluated and ‘method of subordination function’ and ‘method of coordinate composite evaluation of multiple dimension space’ was compared. The result showed that the evaluation results was Cinnamomum camphora (Linn.) Presl>Fokienia hodginsii (Dunn) Henry et Thomas>Platycladus orientalis (Linn.) Franco>Robinia pseudoacacia L.>Broussonetia papyrifera >Elaeocarpus sylvestris (Lour.) Poir. by method of subordination function and the contribution rate of different process of water transportation was different in different tree species seedling; the evaluation results was Robinia pseudoacacia L.>Platycladus orientalis (Linn.) Franco>Cinnamomum camphora (Linn.) Presl>Broussonetia papyrifera>Fokienia hodginsii (Dunn) Henry et Thomas>Elaeocarpus sylvestris (Lour.) Poir. by method of coordinate composite evaluation of multiple dimension space. The method of coordinate composite evaluation of multiple dimension space was relatively suitable under condition of less tree species