濒危植物缙云黄芩的克隆构型和分株种群特征及其环境因子分析  

CLONAL ARCHITECTURE AND RAMET POPULATION CHARACTERISTICS OF SCUTELLARIA TSINYUNENSIS AND ANALYSIS OF THE RELATED ENVIRONMENTAL FATORS

作　　者：何平 傅玉凡[2] 

机构地区：[1]重庆市林业局 [2]西南师范大学生命科学学院

出　　处：《重庆林业科技》2005年第3期5-13,共9页Journal of Chongqing Forestry Science and Technology

基　　金：国家自然科学基金资助项目（30070080）

摘　　要：克隆植物在基株和种群水平上的形态可塑性变化分别表现为克隆构型和分株种群特征的变化，这种可塑性变化对于克隆植物适应环境异质性具有重要意义。在对仅分布于重庆市缙云山国家级自然保护区、呈现濒危特征的根茎克隆植物缙云黄芩（Scutellaria tsinyunensis）的9个样地的8种环境因子调查的基础上，通过方差分析和聚类分析把9个样地归并成群落透光度和土壤水分含量差异显著的密林、疏林和林缘旷地3类生境。通过对这3类生境9个样地缙云黄芩的根茎节间长度、间隔子长度、分枝强度、分枝角度4个克隆构型特征指标和分株密度、分株高度、总生物量3个分株种群特征指标的测定与分析以及联系环境因子进行的逐步回归分析，探讨了缙云黄芩克隆构型和分株种群特征在不同生境中的可塑性变化及其主导环境影响因子。结果表明：缙云黄芩的克隆构型和分株种群特征在3种不同的生境中差异显著。Kruskal Wallis检验表明，根茎节间长度、间隔子长度和分枝角度克隆构型特征参数的分布型在3种不同生境间差异显著。Two-Sample Kolmogorov-Smirnov Test对9个样地间的根茎节间长度、间隔子长度和分枝角度等克隆构型特征参数的分布型的相似性比较表明同类生境间相似程度高。不同的生境间相似程度较低。根茎节间长度、间隔子长度和分枝角度分布型的偏斜度在密林生境中向小于平均值方向偏斜，而在林缘旷地生境中向大于平均值的方向偏斜，在疏林生境中，两种方向的偏斜都存在。分株密度。分株高度和种群生物量3个分株种群特征参数的变化趋势均是：密林〉疏林〉林缘旷地。逐步回归分析表明，群落光照强度和土壤水分分别是克隆构型和分株种群特征可塑性变化的主导环境影响因子。随着生境群落透光度的增加和土壤水分的减少，缙云黄芩�Plasticity of clonal architecture and ramet population characteristics of the clonal plant plays an important role in the adaptation to environmental heterogeneity for the clonal plants. Scutellaria tsinyunensis is a rhizomatous clonal grass species that is endemic to Mt. Jinyun of Chongqing, China, and appearsendangering based on recent observations. With the helps of the variance analysis and cluster analysis of 8 environmental variables in 9 sampled sites of Scutellaria tsinyunensis populations, we can group the 9 sites into closed forest, sparse forest and open land of forest edge 3 types of habitats that notably differ from each other in the transparency of community and the soil water content. We compared the rhizomatous internode length, spacer length, branching intensity, branching angle, ramet population density, ramet height and total biomass of Scutellaria tsinyunensis in the 9 sites, and conducted the step regression analysis between clonal architecture, ramet population characteristics and 8 environmental variables. The results reveal that there are significant differences both in the clonal architecture and in the ramet population characteristics among the 3 types of habitats. Kruskal Wallis test indicated that the distributions of the clonal architecture such as rhizomatous internode length, spacer length and branching angle are significant difference among three habitats. Two-Sample Kolmogorov-Smirnov Test indicated that the similar of distribution of rhizomatous internode length, spacer length and branching angle is very great among the same type habitats, and very little among different type habitats. The skewnesses of hizomatous internode length, spacer length and branching angle deviated below their means in the closed forest, and deviated above their means in open land of forest edge, and deviated both above and below their means in sparse forest. The step regression analysis indicated that the light intensity of community and the soil water content are the leading environmental factors that

关 键 词：濒危植物 缙云黄芩 克隆构型 分株种群特征 环境异质性 可塑性变化 

分 类 号：Q949.777.6[生物学—植物学]