南北样带蒙古栎林径级结构研究

Studies on diameter-class structures of Quercus mongolica forest in North-South Transect

对南北样带上出现的蒙古栎林进行了调查,从种群结构、更新情况等方面来阐述其基本情况,依据种群结构将其分为3种类型:增长型、稳定型及受干扰后的波动稳定型种群;三者不但体现了种群的不同更新阶段,还反映了群落的不同演替阶段。重点分析了蒙古栎种群繁殖策略中的两种更新方式对其广泛分布态势的重要意义,萌生更新常在种群发展的前期起到相对重要的作用,使得该种群在数量上占有一定的优势,而实生更新的作用则主要在种群发展相对成熟的时候才表现的更加明显,两种更新方式的互补作用是使得蒙古栎林能在东北、华北地区广泛分布,并占据一定优势地位的主要原因。

In this study,the Quercus mongolica forests in North-South Transect were investigated,and the basic situation including community composition and regeneration methods were presented. Based on the community structures,three kinds of communities were grouped：expanding,stable,and fluctuated stable after disturbance. These three types of communities not only embodied the different stages of community regeneration,also reflected the different stages of community succession. The roles of two regeneration methods of breeding strategy in the wide distribution of Quercus mongolica were analyzed. Sprouting played a relatively important role at the early stages of the population development,and made the population occupies certain dominance in number,where as seedling was more obvious in mature population. Therefore,the complementation of sprouting and seedling was the main reason which made the Quercus mongolica widely distributed and occupies dominance in north China.