首页|岩溶穴居性陆氏石山苣苔群落物种组成与生态位分析研究

岩溶穴居性陆氏石山苣苔群落物种组成与生态位分析研究

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根据对陆氏石山苣苔模式产地的实地调查与取样,采用定量分析的方法,研究了其模式产地草本植物群落中重要值排名前20的物种优势度、生态位宽度、生态位重叠值以及环境土壤肥力值.结果表明:(1)陆氏石山苣苔在其模式产地中具有明显的优势度,且在Levins、Hurblert生态位宽度指数测度下均排位第二,表明对原生环境中资源的利用程度高,但Pianka生态位重叠显示当产生竞争关系时陆氏石山苣苔总是处于竞争劣势,竞争能力薄弱.(2)岩溶洞穴环境中不同空间上的环境资源存在明显差异,导致物种间的生态位重叠值与种间关系的复杂性,需依据物种的生物学特性和对环境的需求进行区别研究.(3)陆氏石山苣苔模式产地的资源环境因素彼此之间存在一定的相互关系,这构成了一种保护机制,从而缓解了陆氏石山苣苔因其自身竞争力薄弱产生的生存压力,建议后期工作中应优先加强对其环境的保护.
Species composition, community structure and population niche of the karst cave-dwelling Petrocodon lui
Based on the data collected from the plots investigation along with the implementation Levins, Hurblert and niche overlap formulas, this paper investigated the niche breadth values and niche overlap values of the main herbaceous species were measured in the type locality of Petrocodon lui and soil fertility values in the native environments. The re-sults were as follows:(1) Pet. lui had a higher important value in their habitats. It was ranked the second in the Levins and Hurblert niche breadth index. But the Pianka niche overlap showed that when a competitive relationship occurred, Pet. lui was always at a competitive disadvantage. The above showed that it had a high degree of utilization of resources in the native environment, but the competitive ability was weak. (2) There were significant differences in the environ-mental resources of different spaces in the karst cave environment. This leaded to the complexity of the niche overlap val-ue and the interspecific relationship. Hence the need for research based on the difference between the biological charac-teristics of the species and the needs of the environment. (3) There were certain relations between differently ecological factors and resource availability in the type locality of Pet. lui. Because of the very weak competitiveness of Pet. lui with its accompanying plant species, this mechanism provides some protection to alleviate the pressure on struggling. There-fore, we should make it a priority to protect the natural habitat in our later work.

Petrocodon luikarst cavepopulation nichesoil fertilityenvironmental protection

吴昊天、徐双双、杨世勇、符龙飞、韦毅刚、温放

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安徽师范大学 生命科学学院,安徽 芜湖241000

中国苦苣苔科植物保育中心,广西喀斯特植物保育与恢复生态学重点实验室,桂林植物园,广西壮族自治区中国科学院 广西植物研究所,广西 桂林541006

陆氏石山苣苔 岩溶洞穴 种群生态位 土壤肥力 环境保护

国家自然科学基金国家自然科学基金安徽师范大学研究生科研创新与实践项目广西科学院基本业务费项目广西喀斯特植物保育与恢复生态学重点实验室项目广西喀斯特植物保育与恢复生态学重点实验室项目

31260038314601592016yks0732017YJJ2302216-A-01-0116-A-01-02

2017

10.11931/guihaia.gxzw201704003

广西植物
广西壮族自治区广西植物研究所,中国科学院广西植物研究所,广西植物学会

广西植物

CSTPCDCSCD北大核心
影响因子：0.719
ISSN：1000-3142
年,卷(期)：2017.37(10)
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