森林资源动态预测方法的研究 Ⅳ.改善林分密度管理图预测精度的方法

在用密度管理图进行林分蓄积的动态预测时，建立在优势木平均高和每公顷株数基础上的收获密度效应式存在一定的不足，导致具体林分的预测精度偏低。本文以立木度Ｒｖ为修正系数，来反映林分内营养空间结构对蓄积的影响，从而提高密度管理图的应用精度。该方法可以使福建省杉木、马尾松人工林密度管理图对蓄积量的预测误差标准差分别从４４．３２ｍ３／ｈｍ２、２３．１１ｍ３／ｈｍ２减少到１７．４７ｍ３／ｈｍ２、５．２３ｍ３／ｈｍ２，提高密度管理图在实践中应用的准确性。

Studies on the Dynamic Prediction Methods of Forest Resources Ⅳ. A Method of Improving the Prediction Accuracy of the Stand Density Management Diagram

This paper uses the stocking degree Rv as a correctional coefficient to reflect the influence of the nutritive spatial structure within a stand on the stocking in order to raise the applied accuracy of the stand density management diagram.This method can reduce the standard deviation of the stocking prediction error of plantation density management diagrams of Cunninghamia lanceolata and Pinus massoniana in Fujian Province from 44 32m 3/hm 2 and 23 11m 3/hm 2 to 17 47m 3/hm 2 and 5 23m 3/hm 2,respectively.