西藏墨脱人为干扰下小果紫薇种群结构与动态  

Structure and Dynamics of Lagerstroemia minuticarpa Population by Human Disturbance in Motuo,Tibet

作　　者：刘震[1] 闫淑君[1] 田高飞[1] 吴艳芳[1] 段嵩岚 金妍超 潘刚[2] 

机构地区：[1]福建农林大学园林学院,福建福州350002 [2]西藏农牧学院资源与环境学院,西藏林芝860000

出　　处：《西北林学院学报》2017年第4期40-44,共5页Journal of Northwest Forestry University

基　　金：国家自然科学基金项目(31100303);福建省教育厅重点项目(JA15142)

摘　　要：通过对西藏墨脱人为干扰下小果紫薇种群的样地调查,依胸径大小将林木分级,以林木径级结构代替年龄结构,运用分段匀滑技术,编制小果紫薇种群的静态生命表,绘制其存活曲线、生存函数曲线以及死亡率和消失率曲线,分析小果紫薇种群数量动态变化趋势。结果表明:人为干扰下小果紫薇种群属于增长型,幼苗个体数量丰富,以萌枝更新为主,表明萌蘖能力较强;存活曲线趋于Deevey-Ⅱ型,各龄级有相近的死亡率;死亡率和消失率曲线变化趋势基本相同,同时在第Ⅰ龄级、第Ⅴ龄级和第Ⅸ龄级阶段出现峰值;4个生存函数曲线表明,小果紫薇种群具有前期稳定、中期减弱和后期衰退的特点。在人为干扰下小果紫薇通过萌枝更新维持种群发展。Base on the field survey data of Lagerstroemia minuticarpa population under human disturbance in Motuo of Tibet,trees were graded according to DBH,and the age structure was replaced by DBH structure. By using sectional smoothing technique,the static life table, the curves of survival rate, mortality rate and vanish rate,and survival function were drawn. The results showed that the population of L. minuticarpa fit in with the growing type,and there were abundance of individual seedlings,mainly with sprouting renewal, showing the strong ability of sprouting. The survival curve tended toward Deevey-Ⅱ type, which indicated that the mortality rate in different age-classes was similar. The changing trend of the curve of mortality rate was the same as the curve of vanish rate, and the peak values of these two curves were in the age- classes of 1, 5, and 9. Four survival functional curves showed that the L. rninuticarpa populations grew stably at young stage, decreased very quickly at middle stage and declined at old stage. L. rninuticarpa maintained the population development by sprouting renewal under human disturbance.

关 键 词：小果紫薇 种群结构 种群生命表 种群动态 

分 类 号：S792.99[农业科学—林木遗传育种]