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DENSITY AND BIOMASS DYNAMICS OF PINUS TAIWANENSIS AT SONGYANG COUNTY,ZHEIIANG PROVINCE

Zhang Li-quan (Department of Environmental Science, East China Normal University)  
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).
【Fund】: 国家教委《资助优秀年轻教师基金》
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