香格里拉县种子植物多样性海拔分布格局  

Altitudinal Distribution Pattern of Seed Plant Diversity in Shangri-la County

作　　者：李瑞年[1,2] 杜凡[1] 李云琴[3] 杜小浪[1] 张桥荣 

机构地区：[1]西南林业大学林学院,云南昆明650224 [2]招商局重庆交通科研设计院有限公司,重庆400067 [3]云南省林业科学院,云南昆明650201

出　　处：《西南林业大学学报（自然科学）》2013年第6期13-18,共6页Journal of Southwest Forestry University：Natural Sciences

基　　金：国家自然科学基金委员会-云南联合基金重点项目(U0933601)资助;环保部滇西北野生植物物种资源调查专题项目(物种10-二-3-2)资助;云南省野生动植物保护与利用省级重点学科科研基金项目(XKZ200904)资助

摘　　要：对香格里拉县境内3个省级自然保护区的植物资源进行系统调查，统计所建立的该区植物数据库，建立数字 DEM高程模型并结合物种海拔分布特征，分析香格里拉县种子植物垂直分布格局。结果表明：该区有野生种子植物163科876属3794种；科、属、种的丰富度和种的密度随海拔上升均呈现单峰格局，且丰富度和密度的海拔梯度格局基本保持一致；科和属的丰富度和物种密度最大值的位置偏向于低海拔区域（海拔1900～2200 m），种的最大值则出现在中海拔区域（海拔3100～3400 m）；物种丰富度垂直分布格局的形成与海拔所反映的水、热状况以及物种分布的界限有关，并受到“中间膨胀效应”的影响；种子植物属中北温带成分，且是香格里拉县的主要区系类型，所占比例随海拔上升而增大，而热带属比例则下降，约在海拔1750 m 处出现区系平衡点。The database of plant species was built based on the systematic survey of three provincial level na-ture reserves in Shangri-la County,and the altitudinal distribution pattern of seed plant species in the county was studied by means of establishing the DEMdigital elevation model integrated with the elevation distribution feature of the plant species.The results showed that there were 3 794 species belonging to 876 genera and 163 families of wild seed plants in Shangri-la County.The richness and density of the species,genera and families all showed the single-peak curve along with the elevation increment.There were principal consistences between the change in rich-ness and density of the species,genera and families with the altitude variation.The maximum values of species density,the richness of genera and families appeared at lower altitude around 1 900 -2 200 m range,whereas the maximum value of species richness appeared at mid altitude range of 3 100 -3 400 m.The formation of vertical dis-tribution pattern of species richness was related to water and heat conditions,and the boundaries of species distribu-tion that were all reflected by the altitude,and also affected by the “middle expansion effect”.As seed plants are the composition of Mid-North Temperate Zone,and the major floristic type of Shangri-la County,the proportion of north temperate elements was increased with the increment of altitude,whereas the proportion of tropical elements was decreased.There was a floristic balance point around 1 750 m in elevation.

关 键 词：种子植物 物种丰富度 海拔梯度格局 香格里拉县 

分 类 号：S717.19[农业科学—林学]