A Method for Building an Optimal Model of Forest Stand Spatial Structure Based on Particle Swarm Optimization

Abstract

The invention discloses an establishment method used for a forest stand space structure optimization model and based on a particle swarm algorithm. The establishment method comprises the steps as following: a forest stand area is measured, forest trees which belong to climax group composition tree species and transitional community tree species in the forest stand are measured, the diameter at breast height of each forest tree is larger than 5 cm, and space coordinates, tree species, a mixed degree, a competition index, a uniform angle index, a stand layer index, a space density index and an open comparison index of each forest tree are obtained; and the particle swarm algorithm is adopted, the mixed degree, the competition index, the uniform angle index, the stand layer index, the space density index and the open comparison index which are included in a forest stand space structure are taken as optimization objectives, a multi-objective optimization model of forest space structures in forest stand level is established, forest trees and space structure units which are required to be regulated are confirmed according to objective trees output by the model and space structure units formed by peripheral adjacent trees, the forest stand space structures are regulated, so that the forest structures tend to a reasonable state, and an ecosystem function is recovered.

Description

technical field [0001] The invention belongs to the field of stand space structure optimization and relates to a method for establishing a stand space structure optimization model based on a particle swarm algorithm. Background technique [0002] Water conservation forest is one of the special significance of water and soil protection forest species, its leading function is to conserve water, purify water quality, prevent soil erosion and lake silting and regulate climate. According to system theory and structured forest management theory, the health and stability of water conservation forests depend on the forest structure, and a reasonable forest structure can better play various functions of the forest. The stability of mixed and different-aged forests on the same site is higher than that of pure forests and same-aged forests. The structure of multi-layered, different-aged and mixed forests is an ideal structure on the stand scale of water conservation forests, and at the...

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Problems solved by technology

However, there are still some deficiencies in the existing research results: 1. The research content is mostly focused on the analysis, description and simulation of forest spatial structure, lacking the support of optimal forest management examples; 2. Management measures are mostly based on near-nature management and sustainable forest development It is based on the theory, but it lacks a clear index system and quantitative management objectives, and it is difficult to find the same type of near-natural model forests; 3. There are relatively few related studies that directly take the optimization of forest spatial structure as the management objective. In-depth research has not yet been carried out on issues such as optimization and evaluation; Fourth, most studies have transformed multi-objective problems into single-objective problems, the solution process is complex, the algorithm execution efficiency is low, and there is a lack of more scientific multi-objective optimization methods

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