丰都县南天湖村麦地坪野生观赏植物平枝栒子种群动态  

Population Dynamics of Wild Cotoneaster horizontalis in the Maidiping of Fengdu County,Southwest China

作　　者：李加海[1,2] 陈晓德[1,2] 范文武[1,2] 余学平 何琴[1,2] 

机构地区：[1]西南大学生命科学学院,重庆400715 [2]三峡库区生态环境教育部重点实验室,重庆400715 [3]重庆市北碚区王朴中学,重庆400715

出　　处：《西南大学学报（自然科学版）》2009年第9期31-36,共6页Journal of Southwest University(Natural Science Edition)

基　　金：国家星火计划资助项目(2006EA105025);重庆市海石公园资助项目

摘　　要：平枝栒子(Cotoneaster horizontalis)是一种极具观赏价值的植物,在园林中有着广泛的应用.通过对丰都县南天湖村麦地坪平枝栒子种群的样地调查,分析了平枝栒子种群的密度变化规律,编制了静态生命表,绘制了存活曲线、死亡曲线和亏损曲线,并定量计算了其种群结构动态,结果表明:(1)平枝栒子种群的平均密度随围级的增加而减少,反映了密度与径级之间存在着一种负相关性,但是r=-0.193 63(p<0.01),说明平枝栒子种群的邻接效应不很明显.(2)平枝栒子种群存活曲线的变化趋势为Deevey-Ⅲ型.(3)Ⅰ龄级时损失度最大,死亡率较高,达90.1%,Ⅷ龄级时死亡率达到最高,损失度达到一个次高峰.(4)平枝栒子种群结构动态为增长型,而Vpi=0.066837,趋近于零,表明平枝栒子种群趋近于稳定型.本研究可为南天湖地区野生平枝栒子资源的可持续开发利用和保护提供理论依据与参考.Cotoneaster horizontalis is a good ornamental plant and has a wide range of applications in garden. In order to provide scientific basis and reference for developing and protecting the resources of wild C. horizontalis in Nantianhu region, a sample plot survey of the C. horizontalis population was carried out at Mediping in Nantianhu Village of Fengdu County, Southwest China, on the basis of which the change pattern of the population of C. horizontalis was analyzed, its static life table was prepared, its survivorship curve, mortality curves and killing power curve were plotted and its population structure dynamics was calculated. The results showed that the average density of Cotoneaster horizontalis decreased with increasing perimeter-class, which suggested a negative correlation between density and perimeter-class, with a correlation coefficient of -0. 193 63 （p〈0. 01）, which showed that the edge effect of C. horizontalis population was not great The survivorship curve of C. horizontalis belonged to the Deevey-Ⅲ type. The mortality and killing power rate peaks of C. horizontalis population were in the first and eighth age grades. The age structure of C. horizontalis was close to the type of growth, and Vpi =0. 066 837, closed to zero, which showed its population was almost stabilized.

关 键 词：麦地坪 平枝栒子 野生观赏植物 静态生命表 种群动态 

分 类 号：Q145[生物学—生态学] S685.99[生物学—普通生物学]