关键词: 区域主体功能区, 城市建设用地, 生态适宜性评价, 潜力—限制性分析, 大连

Abstract:

Ecological suitability assessment on land use is one of the fundamental works to use the limited land resources in China rationally. The conflict between urban land use and eco-environmental protection is very intense in the rapidly urbanized area, and it's important to do ecological suitability assessment on land use in such an area. Based on summing up the application of GIS technology, this study develops a domestic widely-used weighted factor-overlay method and extends it to a weighted potential-constrain approach which is originally from cost-benefit analysis. The main advantage of this approach is to divide the assessment factors into two groups, one contains ecological potential factors, and the other the ecological constrain factors, to choose the factors under the principle intensively of data obtainable, and to determine their weights by choosing exact means. The employment of this approach could help to determine the ecological suitability classes more scientifically and reasonably. In this study the potential-constrain approach is employed in Dalian city region, the analysis shows:(1) the area that could be intensively developed for urban construction purpose is 850.46 km² in Dalian city region, being about 6.28% of the total study area; (2) the area that could be developed moderately for construction purpose is 1835.97 km², or about 13.56% of the total area; and (3) the area that could not be used or being moderately and lightly suitable for construction is 10851.92 km² , or about 80.16% of the total area. Hence the land used for urban construction should be controlled under 20% of the region's total area , and the remaining 80% could not be used for urban development. Furthermore, based on the ecological suitability assessment, four planning zones of construction improvement zone, construction emphasized zone, construction restricted zone and construction forbidden zone could be worked out, in which the development strategies and implementations in each zone are suggested. The following aspects could be discussed in the application of the potential-constrain approach: (1) the resolution of satellitic image, which is the basic data, is one of the most important reasons affecting the precision of the result of assessment, according to different levels and different regional scopes, the right size of satellitic image should be chosen to keep balance between quality and quantity of the data dealt with; and (2) to the exactly assessment object, the factors chosen, the weight determined and the overlaying process should be all considered scientifically and reasonably.

Key words: urban main functional areas, urban construction land use, ecological suitability assessment, potential-constrain analysis, Dalian