湖北桂花林场檫木次生林单木生长模型的研究

Study on individual tree growth model of Sassafras tsumu secondary forest on Osmanthus Forest Farm in Hubei Province

为了更好地开发和利用檫木资源并为其经营管理提供参考依据,利用大小比数并结合多模型选优法对湖北省国营桂花林场檫木次生林的单木直径生长过程进行了分析与探讨.结果表明:不论是竞争优势木还是竞争劣势木,用Richards函数来拟合檫木的直径生长过程效果最好,其次是Schumacher函数,最差的是Gauss函数。但是Richards函数的参数偏多,并且通过Richards函数预估的直径生长量与檫木的实际生长状况不符合,因此,Schumacher函数是描述湖北桂花林场檫木次生林直径生长过程的最佳模型。

In order to develop and use Sassafras albidum better and provide reference basis for its operation and management, the neighborhood comparison combined with multi-model selection methods were used to analyze and discuss individual tree diameter growth progress of S. tsumu secondary forest in Osmanthus forest farm in Hubei province. The results show that whether it is a dominant tree or oppressed tree, Richards function was the best to fit the growth process ofS. albidum diameter, better than Schurnacher function, while Gauss function＇s fitting effect was the worst. However, the parameters of Richards function were too much, and the amount of diameter growth of S. albidum estimated by Richards function was not incompatible with the actual growth conditions. Therefore, Schumacher function was the best model to describe the diameter growth process of S. tsumu secondary forest in Osmanthus forest farm in Hubei province.