基于RS与GIS的兰州河谷型城市边缘区土地可持续利用研究——以西固区为例

兰州河谷型城市边缘区土地利用性质、地域空间结构及地理景观等方面表现为从城市向农村过度 ,从城市土地利用类型向农村土地利用类型过度 ,特定的地形地貌持征和区位条件使其土地利用具有复杂的演变模式和较快的演变速度 ,使土地利用规划管理变得十分复杂。本文以兰州市西固区为例 ,利用 RS与 GIS技术 ,在对西固区土地利用特征、土地利用变化规律及其空间结构分析研究的基础上 ,探讨了兰州河谷型城市边缘区土地可持续利用的开发模式及其管制措施

A Study on Sustainable Land Use in Fringe Area of Valley City Lanzhou

Due to the special location and characteristics of the topography and landform, the land use features and areal-spatial structure as well as the geographic landscape,the land use of fringe area of Lanzhou city transmited from urban type to country type,and showed complex assession and relatively rapid assession,which made the plan and managment of land use complex and difficult. Based on the analysis on the features, dynamic rules and the spatial structure of land use practice in the Xigu District of Lanzhou, by applying the remote sensing (RS) and geographic information system (GIS) technique, the following land use evolutionl patterns were found: ① urban constructive land interlocks with agro-land in the valley coral belts, where land use changes from outskirts agri-land-vegetable land-industrial and inhabitant land-business and serving land; ②vegetable land interlocks with orchard and resident land in the platform areas, and the evolution pattern is recognized as: agri-land-vegetable land(or orchard land)-sightseeing agriculture-the park land for tour and sightseeing; ③dry farming land tessellates among wood and grazing land in the mountainous regions with the pattern of land for drought-enduring crops-for all kinds of general agriculture-for the ecological agriculture. According to the above analysis, conclusions can be drawn that the composite model of circle, convergence and divergence should be adopted in exploiting constructive land, and that the multilayered and polycentric model should be the first choice towards agricultural sustainable development in the fringe area of valley city Lanzhou.