摘要
本文研究了浙江省松阳县关山源地区黄山松种群的密度与生物量动态以及它们之间的相互关系。黄山松是该地区森林演替中的先锋种群之一。在演替过程中,黄山松种群的动态可分成三个阶段。大约在黄山松种群入侵次生裸地的最初10年期间,种群的密度和生物量迅速增长(阶段Ⅰ)。此后,种群密度达到饱和,由于自疏作用出现以及其他阔叶树种的入侵,种群密度开始急剧下降,个体平均重量和种群生物量迅速增长(阶段Ⅱ),-3/2自疏定律适用于种群动态的此阶段。随着阔叶树种进入林冠层,虽然个体平均重量仍缓慢增长,黄山松种群的密度和种群生物量逐渐下降直至退出群落(阶段Ⅲ)。但在一些特殊生境中(如裸岩陡坡或山脊),黄山松种群可形成稳定的地形顶极群落,其种群密度、个体平均重量和种群生物量可长期维持相对稳定的状态。
This study was carried out at Guanshanyuan, Songyang County, Zhe-jiang Province. Density and biomass dynamics as well as their interrelati-onship for Pinus taiwanensis populations are described. Pinus taiwanensis isone of the pioneer species in forest succession in this region. The analysisof the population dynamics of Pinus taiwanensis throughout the successionalprocess re(?)ealed the following three phases. Until ca. 9-10 years after Pinus taiwanensis invades the stands, thedensity of population is increased by the (?)ecruitments along with increaseof the mean tree weight and population biomass (phase Ⅰ). Thereafter,the population is in full density state, the biomass of population and themean tree weight increases exponentially, while the density of populationis decreased drastically by the self-thinning and the invasion of otherbroad-leaved trees (phase Ⅱ). The -3/2 power law of natural thinning isapplicable to the population in this phase. When the broad-leaved treesreach the canopy of forest, although the mean tree weight increases slow-ly, the density and biomass of Pinus taiwanensis population decreases gra-dually (phase Ⅲ) until the population senesces and retreats from the su-ccessional series completely. At some special habitats such as rocky steepslopes and ridges, however, Pinus taiwanensis population can form such anedaphic climax community that the density and biomass of population andthe mean tree weight can be in a stable state for quite long period(phaseⅢ).
基金
国家教委<资助优秀年轻教师基金>
关键词
黄山松
种群密度
种群生物量
Pinus taiwanensis
Population density
Population biomass
-3/2 natural thinning
