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采用固定标准地定位观测和临时标准地调查点面结合的方法,研究了杨桦林的密度,得出了杨桦林的最大密度、最佳密度和最小密度数学模型,确定了杨桦林的最佳经营密度与最低经营密度分别为0．70和0．55。
Using fixed standard positioning observation and temporary standard to investigate the point-surface combination method, the density of birch’s poplar was studied, the maximum density, optimum density and minimum density mathematical model of birch’s poplar were obtained, and the best management density and minimum of birch’s poplar Operating density were 0.70 and 0.55 respectively.