抚顺市天然柞树根径推胸径数学模型的研究

Study on mathematic model of root diameter pushing DBH of natural oak in Fushun city

从抚顺市所辖的天然林中随机抽取天然柞树各径级样本共1243株,对其胸径(D_(1.3))、根径(D_(0.05))进行围径测量,采用多模型最优法确定6个建模基本方程,通过麦夸特迭代法进行模型参数计算,对建模方程进行评价确定最优模型。通过适用性检验,确定最优模型为D_(13)=a+bD_(0.05)ln(D_(0.05)^(1.5))+cD_(0.05)^(2)。

A total of 1243 natural oak trees of various diameter classes were randomly selected from the natural forests under the jurisdiction of Fushun city,and their DBH(D_(1.3))and root diameter(D_(0.05))were measured.Six basic modeling equations were determined by the multi model optimization method,model parameters were calculated by the Macquard iteration method,and the optimal model was determined by evaluating the modeling equations.Through the applicability test,the optimal model was determined to be applicable in production.