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本文采用直径分布的方法建立了预测林分结构与林分产量的模型系统。当现实林分的林龄(A)、地位指数(SI)或优势木和亚优势木平均高(H_D)及林分密度(每公顷株数N或每公顷断面积B)已知时,该模型可以预测各径级株数、平均树高以及林分材积。用未经间伐的大兴安岭天然落叶松林的236块临时样地建立并检验了这一模型系统。 威布尔、S_B、β及综合Г分布拟合实际林分的直径分布,结果表明:综合Г分布拟合最佳,但威布尔分布也较适合。文中提供的模型系统包括:单木材积——D~2H、树高曲线模型;综合Г分布和树高曲线的参数预测模型。为了更适宜地描述现实林分,采用新的方法预测了存活木株数及树高曲线,并建立了地位指数方程。该摸型系统编成计算机软件可以预测目前及未来林分动态变化。
In this paper, a model system of predicting stand structure and stand yield was established by means of diameter distribution. When the stand age (A), status index (SI), mean height (H_D) of dominant wood and subdominant and stand density (N per hectare or sectional area B per hectare) are known, the model Can predict the diameter of the number of trees, the average tree height and stand volume. This model system was established and tested using 236 temporary plots of the uniroted Daxinganling natural larch forest. Weibull, S_B, β and the integrated Γ distribution fitting the actual stand diameter distribution. The results show that: the comprehensive Γ distribution fitting best, but Weibull distribution is more suitable. The model system provided in this paper includes: single timber volume - D ~ 2H, tree height curve model; parameter prediction model of integrated Г distribution and tree height curve. In order to describe the realistic stands more appropriately, a new method was used to predict the number of surviving woods and the height-height curve, and the index of position index was established. The touch system compiled into computer software can predict current and future dynamic changes in stand.