【摘要】 采用点-四分法和样方法观测了青杄Picae wilsonii林群落。以样点到四象限最近青杄植株距离与各自个体高度的比值之和,定义为开敞度。以此作为林下光水平的参量,从而定量地分析了它与下层植物的关系。群落空间格局与在利用光能时的调节性和互补性的功能作用相对应。青杄幼苗仅在高开敞度下生长;Shannon-Wiener种多样性指数随开敞度而增加。各个种群在光资源轴上不同分布的生态位重叠指数等多方面研究,证明种群分布对光照水平差异的选择性。更多还原

【Abstract】 The Coniferous forest community was surveyed and measured by Pointquar-ter and quadrat methods. Opening degree is defined as the sum of ratio of the distance from the point to the nearest coniferous forest irdividuals in each quadrat to their height. The relationship between opening degree and the undergrowths of the quadrat was analysed quantitatively.The community spatial pattern corresponds with its function in regulation ard compensation on use of sun light energy. It is found in our studies that the coniferous seedlings appear only in high opening degree; Shannon-Wiener diversity index increases with the increase in opening degree and there is niche overlap of the different distributions of populations on the axis of light source. All this shows that the distribution of populations depends on the light levels.更多还原