黄牛木种群生长模型及动态模拟

为了解黄牛木（Cratoxylum cochinchinense）的生长规律和种群动态,促进其在城市林业和景观生态方面的应用和推广,研究通过对典型样地内黄牛木种群生长因子的测定,运用SPSS、ArcGIS 等软件进行数据整理和分析,构建种群树高、冠幅、数量与胸径的相互关系函数模型,绘制种群生长变化三维模拟图,直观地呈现种群的生长规律和变化动态。结果表明：茶山和白云山样地的黄牛木生长呈现“金字塔型”,为增长型种群,石花山样地黄牛木生长呈现“纺锤型”,为稳定型种群;茶山样地生境比较稳定,白云山样地生境相对稳定,石花山样地生长压力大干扰黄牛木生长;树高（y1）、冠幅（y2）与胸径（x）的最佳拟合模型为幂函数,数量（y3）与胸径（x）的最佳拟合模型为指数函数;现阶段,各样地黄牛木还处于生长期,未来,黄牛木个体数量将随时间推移逐渐向中老径阶集中,老龄个体增多,幼龄个体减少,因此要加强对黄牛木生长动态的监测和管理,适时地采取合理的护林抚育措施,从而促进黄牛木天然林的演替与更新。

Growth Model and Dynamic Simulation of Cratoxylum cochinchinense Population

To understand the growth law and population dynamics of Cratoxylum cochinchinense, then promote its application and promotion in urban forestry and landscape ecology. The study used SPSS, ArcGIS, and other software to organize and analyze data by measuring the growth factors of C. cochinchinense. It is used to construct the functional model of the relationship between population tree height, crown, quantity and chest diameter, and the map of three-dimensional simulation diagram of population growth and change were drawn to show the growth law and the dynamics change. Our research revealed that the population was the growth type for the number showed "pyramid" in Tea-mountain and Baiyun-mountain, while was the stable type for the number showed "spindle" in Shihua-mountain. The habitats were relatively stable in Tea-mountain and Baiyun-mountain, while the growth was disturbed from environmental pressure in Shihua-mountain. The function models of height-DBH and crown width-DBH were power, and the best-fitting model of quantity-DBH was exponential function. At this stage, the C. cochinchinense in various plots is still in the growing period. In the future, the number of scalp wood individuals will gradually concentrate in the middle and old diameter classes over time, then the number of elderly will increase and the number of young will decrease. Consequently, it is necessary to strengthen the monitoring and management for the growth dynamics, then take reasonable forest protection and tending measures in time to promote the succession and regeneration C. cochinchinense population.