Study On Structure Optimization And Tree Species Arrangement For Jiaonan Coastal Protective Forest System

Based on the analysis of actualities of Jiaonan coastal protective forest system, the optimization of its system structure and tree species arrangement were studied by the Analytic Hierarchy Processs(AHP) method. Furthemore, the assessment on its ecological benefit before and after optimizing was carried out. The main results are as follows:In Jiaonan city, the agriculture land and the forest land account for 63.26% and 35.16% respectively. As a barrier of regional eco-safety, the forest land area is not large enough to take the role in environment construction. Therefore, it is necessary to enlarge its forest area by the way of afforesting wasteland and replanting thin forest and shrub land.After the forest types optimization by AHP method, protective forest, timber forest, economic forest, fuelwood forest and forest for special use account for 51.93%, 19.32%, 16.81%, 4.26% and 7.69% respectively. The area of protective forest account for more than 50% to the total forest land, among theme, the wind shelter and sand fixation forest account for 40.32%, so it embodies the idea of developing the eco-protective shelterbelt system. The area of timber forest and economic forest are decreased compared with that of before optimization, while the area of the forest for special use ascend greatly, which can meet with the demands of touring, entertainment and pursuing happiness.After the tree species optimizing, the main tree species of the wind shelter and sand fixation forest are Pinus thunbergi, Robinia pseudoacacia, Tamarix...