塔里木河流域胡杨种群自然更新状况的种群生态学分析

摘要/Abstract

摘要： 通过样地调查和数据统计,对塔里木河流域不同生境内胡杨种群的径级结构、年龄结构、生命表及存活曲线进行了比较分析。同时,使用种群动态量化方法定量的分析了胡杨种群数量的动态变化。结果表明,由于生境条件的不同,胡杨种群结构存在着差异性,尤其是下游胡杨种群与上、中游种群的差异性较大。上、中游胡杨种群的幼苗丰富,种群径级大小、年龄结构均呈金字塔型,存活曲线符合DeeveyC(凹)型,且其动态指数均大于0,为增长型种群;而下游胡杨种群的幼林株数（10 a以内）较少,长势较差,出现很多枯死幼树,种群结构属于中部大,两端小的偏正态分布,存活曲线呈现凸型,且其动态指数小于0,为衰退型种群。

关键词: 种群结构, 动态指数, 特定时间生命表, 存活曲线, 胡杨

Abstract: The diameter-class structure, age-class structure, time-specific-life-table and survivorship curves of P. Euphratica populations in different habitats of Tarim River were analyzed on the base of a field investigation. In order to analyze quantitatively the dynamic changes of P. euphratica populations, population dynamics quantitative analysis method was also adopted. The results showed the population structures were different in different habitats, especially there was significant difference among downstream, upper and middle reaches of Tarim River. The seedlings of P. euphratica populations were abundant at upper and middle reaches of Tarim River, and the diameter-class and age-class structures of populations presented pyramidal form with a survivorship curve of Deevey-C (concave-type) type. Moreover, the dynamic indices of populations were bigger than 0, and these populations were progressive. Compared to populations of upper and middle reaches of Tarim River, the seedlings number at downstream reaches of Tarim River is rare and the growth is bad. The diameter-class and age-class structures of populations there presented a skewed normal distribution and with a survivorship curve of convex-type. Furthermore, the dynamic indices were less than 0, which indicated the populations were degenerative type.

Key words: population structure, flop index, time-specific life table, survivorship curve, Populus euphratica

中图分类号:

Q948.15

吴俊侠;张希明*;李利;邓潮州;刘国军;. 塔里木河流域胡杨种群自然更新状况的种群生态学分析[J]. 中国沙漠, 2010, 30(3): 582-588.

WU Jun-xia;ZHANG Xi-ming;LI Li;DENG Chao-zhou;LIU Guo-jun;. Population Ecology Analysis on Natural Regeneration of Populus euphratica Populations in Tarim River[J]. JOURNAL OF DESERT RESEARCH, 2010, 30(3): 582-588.

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