黄藤人工林茎长分布模型的建立

Establishment of the Model for Stem Length Distribution Of Damonorops margaritae Plantation

对广西大青山黄藤人工林固定样地进行调查和收集资料,选择Logistic、Weibull和Richards3种理论生长方程,采用两次曲线拟合法分别描述母茎长和萌茎长结构规律,旨在建立黄藤人工林茎长分布模型.研究结果表明:Logistic方程对于描述母茎长和萌茎长结构规律均适合,Weibull和Richards方程则分别适合于拟合母茎长和萌茎长的分布特征;通过比较拟合效果,分别建立了Weibull和Logistic方程中的b、c参数与林分因子相关的参数预测模型,结合林分生长模型研制了基于两次曲线拟合的茎长分布模型.经检验,所建立的黄藤人工林茎长分布模型预测精度高,可在生产上应用.

Based on the data and materials collected from many years＇ investigation over the sample plots in Daernonorops margaritae plantation in Daqingshan, Guangxi Province, this paper established a model for its stem length distribution by choosing three growth equations （Logistic, Weibull and Richards） and using a method of twice curve fitting to describe the rule of length distribution for mother stem and sucker stem. Results indicate that Logistic equation is able to describe the characteristics of length distribution for both mother and sucker stem while Weibull and Richards equations are more suitable for fitting the rule of length distribution for mother and sucker stem respectively; that after an analysis of the fitting effect, the parameter prediction model is developed by correlating the parameters b, c in Weibull and Logistic equations with the stand factors; that in combination with stand growth models, the model of stem length distribution is finally established based on twice curve fitting. This model, being of high precision, has been proved to be applicable to the prediction of stem length distribution.