密度制约作用对箭叶淫羊藿有性繁殖时期形态特征的影响

运用回归分析和非参数检验方法，研究了箭叶淫羊藿(Epimedium sagittatum)在有性繁殖的三个时期克隆片段密度对其各个形态特征的影响，以揭示其资源和繁殖投资情况。结果表明：箭叶淫羊藿在三个有性繁殖期间克隆片段密度对其各个形态特征的影响显著。从回归分析的R2指数来看，其克隆片段密度增大对三个生长时期的制约作用是由弱到强，同时在有性繁殖期间随克隆片段密度的增加其资源投资趋向于有性繁殖；从非参数检验结果来看，有性繁殖期间箭叶淫羊藿明显增加其叶数、叶宽等来获取更多的资源用于提高其繁殖能力，以取得生存。

Effects of Population Dentisy on Morphological Characteristics of Epimedium sagittatum in Different Growth Periods

To reveal the resource and reproduction patterns of Epimedium sagittatum, the effects of clone fragment density on clonal morphological characteristics were investigated during three periods of sexual reproduction with regression and nonparametric test. The results indicated that significant effects of clonal fragment density on clonal morphological parameters. Based on the results of regression, the intensity of density dependence effect was enhanced, and more resources were allocated to sexual reproduction with the density of clone fragments increased. The results of nonparametric test revealed that the leaf number and leaf breadth of clone were gradually increased to gain more resource to enhance the reproduction capacity.