绥宁县用材林林龄结构优化研究

针对绥宁县用材林林龄结构现状,应用系统动力学原理对用材林林龄结构优化进行建模,通过计算预测在不同采伐模式下用材林蓄积保有量和出材量的变化,从而找出最优的采伐模式。结果表明:用材林最优采伐模式即轮伐期为40年,择伐周期为15年,择伐强度为30%,抚育间伐周期为15年,抚育强度为15%。在这种优化模式下,到2025年绥宁县用材林蓄积保有量将达到10 186 848 m3,出材量将达到249 006 m3,使用材林发展达到生态效益和经济效益兼顾的最优状态。

The age structure optimization of timber forest in Suining County

In view of the status quo of age structure of timber forest in Suining County, the principle of system dynamics was used to model for the age structure optimization. The changes of volume and outturn of timber forest under the different cutting patterns were calculated to find out the optimal cutting pattern. The results showed that, the optimal cutting pattern was the rotation period for 40 years, the selective cutting cycle for 15 years, the selective intensity for 30%, the thinning cycle for 15 years, and the thinning intensity for 15%. Under this pattern, the volume of timber forest could achieve 10 186 848 ms and the outturn could reach 249 006 ms in 2025, which could realize the optimum combination between ecological benefit and economic benefit.