翅果油树地理分布与生态环境关系分析

摘要

Elaeagnus mollis is an endemic to China,being on e of the state-protected two-grade rare and threatened plant species,and distribute d mainly in Yicheng,Jiangxian and Pinglu located in hills of Zhongtiao Mountains ,Xiangning,Jishan,Hejin and Xinjiang,situated in the southem end of Lüliang Mor untains,Shanxi,and in Huxian at the northem foot of Qinling Ranges,Shaanxi.The r elationship between E.molli distrbution and eco-environment factors was stu died by using Kira′s Warm Index(WI),Cold Index(CI) and Xu Wen-duo′s Humidity Index(HI),and the optimal distributions of WI,CI and HI for E.mollis were go t.Moreover,the distribution region of E.mollis were classified by average-g roup method.The results are as follows:E.mollis is able to adapt to various eco-environment in North China,Northeast China and Northwest China,and its dist ribution region is divided into 4 groups:(1)Xiangning,(2)Hejin,Jishan and Xinjia ng,(3)Jiangxian and Yicheng and (4)Pinglu and Huxian.%翅果油树是我国特有种，为国家2级珍稀濒危保护 植物，仅分布于山西的翼城、乡宁、河津、稷山、河津、平陆、新绛和绛县，陕西的户县， 其中山西乡宁、翼城分布较为集中。应用Kira的温暖指数(WI)、寒冷指数(CI)和徐文铎的湿 润指数(HI)，研究了翅果油树地理分布与生态环境因素的关系，确定了翅果油树最适分布范 围的WI、CI和HI指标，并对翅果油树分布区进行了聚类分析，结果表明：翅果油树在我国“ 三北”地区具有广泛的适应性，其分布区可以分为(1)乡宁，(2)河津、稷山和新绛，(3)绛 县和翼城和(4)平陆和户县四类。