中亚热带檫树群落种间竞争及其种群密度调节的研究

Study on the inter-species competition of Sassafras tsumucommunity in the mid-subtropics and the population density adjustment

研究中亚热带檫树群落种间竞争关系结果表明 ,平衡时檫树与其主要伴生树种光皮桦、丝栗栲重要值分别占 80 .6 4 %、12 .4 7%和 6 .89% ,呈共优状态但分布极不均匀。利用自疏模型并经改进单纯形法最优拟合求得檫树种群密度效应模型 ,且拟合结果达显著水平 ,反映出檫树种群自疏过程密度调节规律。

The inter-species competition of Sassafras tsumucommunity in the mid-subtropics is studied.The results show that in a steady state,the important percentages of Sassafras tsumuand its main associated species—Betula luminiferaand Castanopsis fargesiiare 80.64%,12.47%,and 6.89%,respectively.They share the environment resources in a good state,but the distribution is uneven.The density effective model is given by using the self-thinning model and adjusting the optimum adaption,the simulate result is good,reflecting the natural thinning of Sassafras tsumuHemsl population more accurately.