中华水韭松阳居群的群落结构与种间联结性研究  

Community characteristics and interspecific association of the Songyang population of Isoetes sinensis

作　　者：朱圣潮[1] 

机构地区：[1]丽水学院生物系,浙江丽水323000

出　　处：《生物多样性》2006年第3期258-264,共7页Biodiversity Science

基　　金：浙江省教育厅项目(20051362);丽水学院科研重点项目(KZ05006)

摘　　要：为全面了解国家一级保护植物中华水韭(Isoetessinensis)的濒危机制,作者对分布于浙江松阳的中华水韭居群的自然生境进行了野外观察,在1m×1m样方尺度上研究了中华水韭与群落中出现频率较高的27个物种之间的联结性。结果表明:群落中物种组成贫乏,其组成成分中温带性质明显,中华水韭在不同小群落中分布密度差异较大,在少数小群落中能形成优势种群。中华水韭与薄叶假耳草(Neanotishirsuta)、鳢肠(Ecliptaprostrata)、短尖苔草(Carexbrevicuspis)等7个种群的种间联结性极显著,与多数种群间联结性不显著;中华水韭与大多数种群的联结系数(AC)值在–0.4至0.4之间,即关联小,说明中华水韭在群落中的存在是相对独立的;仅少数小群落的优势种与中华水韭之间有种间竞争。中华水韭受生境和种间竞争影响较大,生态适应性差。此研究结果对制定该物种合适的就地保护措施和恢复计划具有参考价值。Isoetes sinensis （Isoeteaceae）, a critically endangered species in China, has declined rapidly in population size in recent years. Interspecific associations, which play an important role in ecosystem functioning, can reflect interspecific competition within communities. We investigated the habitat characteristics of the L sinensis population in Songyang of Zhejiang Province using 1 m×1 m quadrats. Based on 2×2 contingency tables using test and association coefficients （AC）, we analyzed the interspecific associations of I. sinensis with 27 common species frequently appearing in the community. The results showed that species abundance of the community was poor and the community was dominated by temperate elements. Isoetes sinensis can form the dominant population in a few microcoenses, but its density varied remarkably in different community types. The x^2 values implied that L sinensis had close relationship with seven species such as Neanotis hirsuta, Eclipta prostrata and Carex brevicuspis, but had no correlations with most species, with association coefficients （AC） ranging from -0.4 to 0.4. With poor ecological adaptability, L sinensis is greatly affected by habitat and interspecific competition in the community. This result can provide information for design of an appropriate conservation strategy and restoration plan for L sinensis.

关 键 词：ISOETES SINENSIS 种间联结 群落特征 松阳居群 联结系数 

分 类 号：Q948[生物学—植物学]