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Algorithms of Thinning Simulation for Timber Plantation - A Case Study of Chinese Fir

机译:人工林间伐模拟的算法-以杉木为例。

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摘要

Thinning parameters, such as stand initial density, thinning time, number of thinning, thinning interval, intensity, and cutting age, were analyzed; constraints of these parameters were established. Based on these parameters, two algorithms were proposed. One algorithm was used to calculate volume harvest based on thinning parameters to determine the function of the predicted stand volume harvest via various thinning strategies. The other algorithm was used to develop an enumeration iterative algorithm based on the largest volume yield that can be obtained via an optimal thinning strategy. A decision support system of thinning simulation based on these algorithms was developed. Growth and yield models related to Chinese fir (Cunninghamia lanceolata (Lamb.) Hook.) were selected as research examples. When the initial stand was 4000 stems per hectare, site index was 16 meters and cutting age was 30 years, the Chinese fir stand can yield at most 906.74 m~3/ha and 940.74 m~3/ha if thinned once and twice with the corresponding and proposed thinning strategies, respectively.
机译:分析了稀疏参数,例如林分初始密度,稀疏时间,稀疏次数,稀疏间隔,强度和切割年龄;建立了这些参数的约束。基于这些参数,提出了两种算法。一种算法用于根据间伐参数计算采伐量,以确定通过各种间伐策略预测林分蓄积量的功能。另一个算法被用来开发枚举迭代算法,该算法基于可通过最佳稀疏策略获得的最大批量产量。开发了基于这些算法的稀疏模拟决策支持系统。选择与杉木(Cunninghamia lanceolata(Lamb。)Hook。)有关的生长和产量模型作为研究实例。当最初的林分是每公顷4000茎,立地指数是16米,采伐年龄是30年时,杉木林的产量最多可以达到906.74 m〜3 / ha和940.74 m〜3 / ha。相应的和建议的细化策略。

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