Overall Land Use Planning With Multi-objective Based On Ecological Principle

As one of the scarce natural resources, Land is not only the foundation of human survival and development but also an important producing material. With the growth of the population and the development of social economy, the conflict between population and land become more and more sharp. Besides, the environmental problem also appears followed. The fact that is continuous increase of population and the acceleration of the process of urbanization results in the problem of land use, the quality of land is declining, the ecological environment is becoming worse, which restricts the sustainable development of economy. How to use and allocate limited land resource and draw up scientific overall land use planning and make the plan promote the sustainable development of society economy and ecosystem, has become the main task of land management at present.This paper based on the summary of the achievements of research, selected a case study on Wanzhou district with data of land changing, related social economy and natural resources from 1997 to 2005 and studied on the planning system connecting overall land use land planning with ecological plan based on the principle of ecological safety and sustainable development. Meeting the writing requirements of the new round overall land use planning, the year of 2005 as a base year, the years between 2006 and 2010 as the short time target period, the years between 2011-2020 as long time target period, it takes the utility of the overall land use planning not result in the degeneration of land ecological environment and not exceed the ecological Threshold of land as Constraint Conditions, other macroeconomic situation is also Constraint Conditions, build up the model of overall land use planning with multi-objective based on ecological principle, use AHP to evaluate the Optimal Solutions of model(or not inferior solutions), decide optimal decision proposal of overall land use planning, divide land ecological Functional Domain based on natural and social economic data in Wanzhou district and the need of ecological development. The contents and achievements of this study include several aspects as follows:(1) According to investment data of land use changing during 1997-2005 in Wanzhou, it can conclude, based on the analysis of structure of land use, degree, layout, benefit ,change and environmental safety :①The agricultural land is mainly in Wanzhou and accounts for 78.83% of total land area .The second way of land use is unwrought land, it accounts for 11.22% of total land area. The construction land only account for 9.95% of total land area. The structure of land use is unsuitable.②The rate of land use is 88.78% and the index of agricultural land is 78.33% and the lever of urbanization is 46.00% in Wanzhou, which is over the average lever of chongqing,③Sloped infield is much with the distribute of woodland is concentrated and the layout of construction land is scattered.④The benefit of land use is higher than to the average lever of chongqing, but per capital GDP and farmland areas per person is lower than to the average lever of chongqing.⑤The speed of land change is fast in Wanzhou, the main reasons for which are the construction of reservoir, the action of returning cultivated land to forest and the construction of cities and towns. The dynamic degree of water conservancy is highest in the dynamic degree of land use, the reduce of cultivated land is the most in quantity.(2) At the base of the analysis of the structure of land use, degree, layout, benefit and change, analysis the relation between economy, society, environment and land use from many aspects, set up 11 type of land use from the character of land use and the requirement of social development, construct 12 restraint terms of the economy ecological index, nature ecological index and macroscopic planning, set up objective function of economy, society and the maximum of ecological benefit. It can get the not inferior solutions of 3 group model by resolve the model. The final object of land use in Wanzhou is at the premise of ecological priority, so according with 3 type benefit and the comparative importance of each factor, give each factor an appropriate weight, use AHP to appraise 3 type plan, the mark of first plan is highest by the result of apprise, take the first plan as the final decision plan. Through the comparative analysis of the ecology benefit of plan decision scheme with that of land utilization in 2005.1 come to the conclusion that the ecology benefit of plan decision scheme is superior to that of land utilization in 2005. Meanwhile, the economic benefit and social benefit also obtain improvement. This shows that the plan scheme comes from the multi- goals overall land utilization plan model which based on ecological idea is reasonable.(3) The traditional method of overall land use planning always uses liner planning or gray liner planning to decide the structural adjustment plan of land use, it can get the final plan with multi-objective based on ecological principle by compare the result of model, this plan superior to the plan decided by liner planning or gray liner planning in the benefit of economy, society and ecology, it shows that the result decided by the plan with multi-objective based on ecological principle is more suitable than the result decided by the normal plan model.(4) It can divide the Wanzhou into 4 zoology functional area based on land use, location, geologic-geomorphologic and the conditions of resources: The ecological cities and towns construction development area, ecological agriculture area, the tour resource development area, the ecological protection area, and offer advice about industrial layout of every area .Let the land resource get the valid protection in Wanzhou, promoting the sustainable development of regional economy, society, and environment.