Adjusting a process-based growth model for varying site conditions through parameter estimation
Adjusting a process-based growth model for varying site conditions through parameter estimation
复制标题
通过参数估计调整基于过程的生长模型以适应不同的场地条件
DOI：
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发表时间：
1993
期刊：
影响因子：
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通讯作者：
T. Burk
中科院分区：
文献类型：
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作者：
R. Sievänen;T. Burk
研究了利用典型林分生长测量值(树木尺寸)估计基于过程的生长模型的参数问题。这些数据包括直径、高度、树木数量和活冠率的测量，这些数据来自代表不同立地质量的地块。对模型参数的可辨识性进行了分析，结果表明：(1)模型的结构使某些参数组合无法识别；(2)手头的数据并不支持所有的参数。减少模型中的参数数量而不失去其生物学意义是不可能的。因此，作为对可辨识性问题的补救，在可辨识性分析和初始估计的基础上对模型进行了轻微的修改，并限制了待估计的参数集。寻求将参数分为两组：一组是结合所有地块估计的参数，另一组是允许不同地块变化的参数。估计的p..。
The problem of estimating the parameters of a process-based growth model using typical stand growth measurements (of tree dimensions) is studied. The data consist of measurements of diameter, height, number of trees, and live crown ratio obtained from plots representing different site qualities. An analysis of the identifiability of model parameters is made which shows (i) that the structure of the model makes certain parameter combinations unidentifiable and (ii) that the data at hand do not support all the parameters. It is not possible to reduce the number of parameters in the model without losing its biological significance. Therefore, as a remedy for identifiability problems, the model has been modified slightly on the basis of identifiability analysis and initial estimations and the set of parameters to be estimated has been restricted. A division of the parameters into two groups is sought: those estimated with all plots combined and those that are allowed to vary from plot to plot. The estimated p...