克隆植物中国沙棘人工林生长动态研究

为了解克隆植物中国沙棘种群生长规律,以样地每木检尺数据为基础、以"空间差代替时间变化法"和"样地编年序列法"为手段,分析了克隆种群、母株种群和子株种群三个层次的生长动态.结果表明,母株种群的高度、地径和冠幅生长过程遵从Logistic模型,可分为"慢-快-慢"三个阶段,符合非克隆植物的生长规律;克隆种群和子株种群的高度、地径和冠幅生长动态符合抛物线方程,其中地径、冠幅以及克隆种群的高度生长过程可划分为"缓慢增加-迅速增加-急剧下降"三个阶段,子株种群高度生长过程可划分为"迅速增加-急剧下降"两个阶段.而且,克隆种群的初期生长取决于母株种群的生长,后期生长则取决于子株种群的生长.这些规律,揭示了克隆植物种群生长的特殊性.

Growth Dynamics of Plantation of Clonal Tree Species Hippophae rhamniodes L. subsp sinensis

In order to understand the laws of plantation growth of clonal tree species Hippophae rhamniodes L.sub- sp sinensis,growth dynamic at the level of clone population,mother ramet population and daughter ramet population are studied on the basis of measurement of all individuals in a plot and using the method of spatial series substitu- ting for time series and plots arranged with age.The results showed that the growth process of height,basal diame- ter and crown area of mother ramet population followed Logistic model with three period of"slow-rapid-slow",and the process accorded with that of non-clonal plant.The growth process of height,basal diameter and crown area of clone population and daughter ramet population followed parabolic curve,in which the growth process of basal di- ameter,crown area and the height growth of clone population could be divided into three periods of"slow increas- ing-rapid increasing-rapid decreasing",and two periods of"rapid increasing-rapid decreasing"for daughter ramet population.And the growth process of clone population was decided by mother ramet population in the period of slow increasing and by the daughter ramet population in the period of rapid increasing and rapid decreasing.The process of clone population and ramet population revealed the particular characters on growth of clonal plant.