浙江中部七子花种群结构与空间分布格局的研究

Study on Heptacodium miconioides Population Structure and Spatial Distribution Pattern in the Central Zhejiang Province

为揭示七子花的种群特征,在浙江中部3个七子花主要分布地设置500 m2样方10个,应用相邻格子法对七子花的种群结构和空间格局进行了研究。结果表明,七子花种群结构呈纺锤型,幼苗极少,大树也不多,种群主要集中在幼树、小树和中树阶段,显示出衰退的变化趋势,不同样地的七子花种群结构特征有所差异;由于生境条件的不同,不同样地表现出复杂的分布格局,其中生境条件较差的种群集群程度较高,在人为干扰后,集群程度有减弱的趋势,而某些生境条件较好种群的集群强度较弱,甚至呈随机分布;不同发育阶段种群空间分布格局有差异,总体上有集群分布向随机分布、聚集度高向聚集度低变化的趋势;不同区组大小的七子花种群分布格局不同,不同样地之间差异不明显。

On the basis of population investigation by tally in the contiguous grid quadrat, 10 plots of 500 m^2 in Bei Mountain, Dapan Mountain and Dongbai Mountain were investigated and analyzed to reveal population structure and spatial distributive pattern of Heptacodium miconioicles in central Zhejiang Province. The result showed that there were obvious differences in the characters among the H. miconioides communities and populations. The diameter structure of different populations had only one type： spindle-like form structure： infant seedling and big tree were thimbleful, which indicated its population recession trend. With the increase of age and difference of development phases, the distribution pattern usually ranged from clump to random, and different size of blocks had been found to have an effect on the spatial patterns. The analysis showed that the spatial distribution pattern of H. miconioides populations was decided mainly by the interaction among the biological, ecological properties and environmental factors. So, conservation strategies should be focused-on in-situ conservation as well as reducing human disturbance and enhancing inter-population genetic exchange.