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研究了福建卫闽林场光皮桦种群的密度随径级年变化以及光皮桦种群个体平均重量与密度之间的动态关系。提出了描述光皮桦种群密度随径级年变化的分段函数表达式以及光皮桦种群个体平均重量与密度之间规律的模型。经实测资料验证，笔者提出的模型在拟合光皮桦种群自然稀疏过程中，均具有较高的可信度。同时，对其它种群的自然稀疏研究也具有普遍意义。
The relationship between the density of Betula luminifera population and the average gravimetric density of Betula luminifera population was studied. A model of segment function expression describing the population density of Betula luminifera with annual variation of diameter diameter and the average weight and density of Betula platyphylla population were proposed. The measured data verify that the model proposed by the author has a high degree of credibility in the process of natural thinning of Betula luminifera population. At the same time, the natural sparse research on other populations also has universal significance.