杭州石荠苧不同地方种群分化及空间利用策略研究

Studies on differentiation and space utilization strategies of different local populations of Mosla hangchowensis

从杭州石荠 (Moslahangchowensis) 5个不同地方种群采集种子 ,在实验室萌发 ,幼苗移植到实验地。在营养生长末期时 ,研究了株高、冠幅、主茎长、最大分枝长、基茎粗、叶面积、一级分枝数、平均二级分枝数、主茎叶对数、根长和根幅等 11个空间结构参数 ,分析不同种群的空间利用策略和分化程度。结果发现 :基本无基因交流的各地方种群产生了不同的适应方式 ,并在表型上有可见的差异。其中惠安种群以扩大冠幅占领较大的横向空间 ,种群分化程度最大 ;杭州种群以增加高度占领较大的纵向空间 ,分化程度次之 ;临海、天台和普陀种群分化程度较小。临海和天台种群水选下层种子萌发生长的植株个体比水选上层种子形成植株个体大 。

Seeds collected from five different local populations of Mosla hangchowensis were germinated in the laboratory, and the young seedlings were transplanted in plots. At the late period of vegetative growth, 11 parameters of spatial structure of M. hangchowensis were measured, including height, crown amplitude, length of the main stem, maximum length of branch, basal stem diameter, leaf area, number of first class branches, number of second class branches, number of leaves growing on the main stem, length and crown amplitude of roots. On the basis of these parameters, space utilization strategies and degree of differentiation of different local populations were analyzed. The results showed that there exist different patterns of adaptation and clear differences of phenotype among populations. The Huian population occupied a larger transverse space by extending crown amplitude and its differentiation degree was highest. The Hangzhou population occupied the larger longitudinal space by increasing its height and the differentiation degree was only second to the Huian population. Differentiation degrees of Linhai, Tiantai and Putuo populations were less. The seeds from the Linhai and Tiantai populations were sorted by water and germinated. The plants from lower layer seeds were larger than those from upper layer seeds, but their space utilization strategies were the same.