陕西府谷杜松自然保护区杜松种群结构与生命表分析  

Study on the population structure and life table of the endangered population of juniperus rigida in fugu nature reserve in shaanxi province

作　　者：褚胜利[1] 李登武[2] 李景侠[2] 

机构地区：[1]西北农林科技大学生命科学学院,杨陵712100 [2]西北农林科技大学林学院,杨陵712100

出　　处：《四川大学学报（自然科学版）》2008年第1期176-180,共5页Journal of Sichuan University(Natural Science Edition)

基　　金：国家自然科学基金(30671672);中国科学院知识创新项目(KZCX1-06)

摘　　要：为了阐明杜松(Juniperus rigida)种群的年龄结构和未来发展趋势,合理保护现有资源,编制了该种群的静态生命表,绘制了存活曲线和死亡率曲线,以及4种生存函数曲线.结果表明:杜松种群数量少,幼苗更新不良,属于衰退型种群.杜松种群的存活曲线属于左偏正态型,该种群的死亡率与消失率变化趋势基本一致.龄级Ⅰ与Ⅱ的值为负,在Ⅵ龄级达到最大.导致种群衰退的原因有种子萌发和幼苗生长困难和比较严重的人为干扰.应当提高种子的萌发率,人工培育幼苗,形成不同龄级的种群更新体系,减少人为干扰,以达到保护杜松的目的.4个生存函数曲线表明:杜松种群具有前期增长,中期减少,后期衰退的特点.In order to characterize the age structure and dynamics of the Juniperus rigida population so as to better conserve its resources, the static life table, the curves of survivorship, mortality rate of the population were drawn. The results showed that the numbers of Juniperus rigida population was very limited. The population is of declining type. Its survival curve could be left-skewed type. The discipline of mortality ratio showed the similar dynamics to that of the hazard ratio. The mortality rates and hazard rates at age class Ⅰ and age class Ⅱ were negative, and the highest points appeared at age class Ⅵ. The key cause for population decline was that shade in the forest obstructed germination, seedling growth and human disturbance. The best way to protect the rare plant is that increasing the number of seedlings and decreasing the human disturbance.

关 键 词：杜松种群 静态生命表 存活曲线 人为干扰 生存函数 

分 类 号：Q948[生物学—植物学]