A Study On Vegetation Structure Regulation Of Spatial Allocation In Protection Forest System

Spatial allocation of protection forest system plays a key role in protection benefit of protection forest system. By regulating vegetations structure to or close to an ideal module, the purpose of spatial allocation regulation is to maximize protection benefit of protection forest system under land use and other restrictions within regional development planning.Essentially, spatial allocation regulation of protection forest system is a complex system engineering. Based on state of the art of theories, methods, and techniques, an optimization model of vegetations structure was implemented, adjusting elements and procedures were identified, an regulating model was developed based on staging regulating, and a decision support system was constructed for spatial allocation regulation of protection forest system.Major results :(1) An optimization model of vegetations structure for spatial allocation of protection forest system. Coupling qualitative expert knowledge with quantitative analysis, the optimization model was developed based on analytic hierarchy process with maximizing protection benefit and considering social and economic benefit as objectives. Therefore, this optimization model provides the goal for spatial allocation regulation of protection forest system.(2) Regulating elements for spatial allocation regulation of protection forest system. Six critical elements provide theoretical basis for the development of regulating models. These include regulating goal, regulating term, regulating unit, regulating measure, regulating priority, and regulating benefit weight.(3) Regulating procedures for spatial allocation regulation of protection forest system. The process of spatial allocation regulation of protection forest system was divided into applicable and specific procedures, which provide a solid algorithm and system framework for the development of a decision support system.(4) A staging model for spatial allocation regulation of protection forest system. The model is based on 0-1 integral programming with maximum protection benefit as objective function and budget, constant incremental areas of various vegetations and others as restrictive terms. The model generates applicable and subcompartment oriented regulating plans.(5) Optimization and regulation for spatial allocation of protection forest system at Banchengzi reservoir area. A case study was conducted at Banchengzi reservoir area in earth-rock mountainous region in northern China. Results indicate that a comprehensive, state of the art, and feasible regulating plan is achievable for the construction of protection forest system in earth-rock mountainous region in northern China.(6) A decision support system based on GIS for spatial allocation regulation of protection forest system. With user friendly interface, the system integrates above theories and methods. The decision support system allows managers of protection forest system to test and compare different regulating scenarios on computers and eventually select the best regulating plan.