非线形方程模拟青海云杉林径阶动态变化及经营决策评估

Dynamic Varivation of Diameter Grade and Evaluation of Management Decision of Picea Crassifolia Forest by Using Non-linear Programme

本文以矩阵模型为基础，利用林分进界生长、林分直径净生长量及枯损量的资料，拟合了祁连山青海云杉林动态系统模型，并模拟了以１０％采伐强度抚育下，不同抚育间隔期的林分动态。从求解结果中得出现实青海云杉林在经过一定强度的抚育采伐后，林分将趋向于一种稳定结构，在１０％的抚育强度下，择伐周期以１５年为宜，同时还得出各种抚育方案下的保留蓄积出材量等初步结论。

Based on matrix model, by using the data of diameter grade,netincrement of diameter and loss of stand,the dynamic model has establishedfor Picea crassifolia forest in Qilian Mountains,It simulate the dynamicchange within different peiiods of tending felling.The iesults indicate thatstand structure will become stable after with a certain tending felling intensity,with ah period of 15 years