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额济纳绿洲胡杨林更新及群落生物多样性动态
引用本文:高润宏,董智,张昊,李俊清.额济纳绿洲胡杨林更新及群落生物多样性动态[J].生态学报,2005,25(5):1019-1025.
作者姓名:高润宏  董智  张昊  李俊清
作者单位:1. 内蒙古农业大学林学院,呼和浩特,010019
2. 北京林业大学省部共建森林培育与保护教育部重点实验室,北京,100083
基金项目:国家教育部“春晖计划”资助项目 (Z2 0 0 4-2 -15 0 17),国家自然科学基金资助项目 (3 0 4713 69)~~
摘    要:研究额济纳绿洲胡杨群落演替中的生物多样性指数与胡杨林年龄、密度、地下水埋深、地表土壤含水量的相互关系,及胡杨更新中的根蘖株数、实生株数与胡杨林年龄、密度相互关系。结果表明:胡杨种群在更新过程中根蘖株数与胡杨年龄、密度相关显著,根蘖性随胡杨年龄增长而加强,随密度增大而减弱,实生株的分布与胡杨年龄相关显著,而与密度、遮萌度相关不显著,实生苗只出现在中龄林中,而在老龄胡杨林和幼龄胡杨林中均无胡杨实生苗;胡杨群落演替过程中生物多样性与群落的土壤含水量、地下水埋深和林冠遮萌度相关不显著,而与胡杨的年龄、密度相关显著,胡杨群落在演替过程中生物多样性和均匀度增高,个体数量却减少,胡杨在种群发育过程不仅表现出自疏现象,并在群落演替过程中表现明显的排斥异种现象。一个观点:逆境生存的建群植物种个体繁殖的最大收益性导致群落演替出现间断现象。由于极端环境胁迫下,胡杨在繁殖对策选择上,在胡杨林内胡杨种群更新选择以无性繁殖为主,而在胡杨林外的其它生境中胡杨种群更新以有性繁殖为主。针对上述观点,胡杨保护和更新在不同的生境中以不同的更新方式进行。

关 键 词:额济纳  胡杨  生物多样性  相关
文章编号:1000-0933(2005)05-1019-07
修稿时间:3/4/2005 12:00:00 AM

Study on regeneration process and biodiversity characteristic of Populus euphratica community in the Ejina Natural Reserve, Inner Mongolia of China
GAO Runhong,DONG Zhi,ZHANG Hao and LI Junqing.Study on regeneration process and biodiversity characteristic of Populus euphratica community in the Ejina Natural Reserve, Inner Mongolia of China[J].Acta Ecologica Sinica,2005,25(5):1019-1025.
Authors:GAO Runhong  DONG Zhi  ZHANG Hao and LI Junqing
Institution:Inner Mongolia Agricultural University; Hohhot; China
Abstract:Populus euphratica population generation patterns and Populus euphratica forest community biodiversity characteristic in successive proceedings are discussed in this paper. The intention is to disclose regeneration and restoration mechanism of Populus euphratica population and community. Such relative aspects as between age, density, and degree of shade, between root reproduction, seedling and age, density, between Populus euphratica forest community biodiversity index and evenness index, and soil water content, underground water depth,as well as the regression on Populus euphratica population age, density and degree of shade. The results showed:(1)Root reproduction regeneration of Populus euphratica is relative to Populus euphratica age and density, seedling regeneration is relative to Populus euphratica age, the old-aged forest of Populus euphratica may restrict to seedling regeneration.(2)the regression relations between age and density of Populus euphratica shows there is obviously dispersal effect among the individual of evenaged forest.(3)biodiversity index and evenness index are related to age and density of Populus euphratica, and unrelated to soil water content and underground water depth, with the of Populus euphratica age growth, the biodiversity index and evenness index are increasing, while the numbers of species and individual is decreasing. One hypothesis: the most reproductive benefit of constructive species usually leads to discontinuing community succession. Constructive plant utilizes the clone in resource-sharing, risk-spread, and foraging behavior to enlarge the habitat heterogeneity, in allelopathy to exclude the other species to attain the most reproductive benefit. this adaptive pattern may form pure community, with the constructive species degradation, the other species can't settle down, therefore, the community succession is discontinued.
Keywords:Ejina  Natural Reserve  Populus euphratica  biodiversity  community succesive
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