The Research On Landuse Pattern Of Kast Trough Valley In Chongqing

Karst trough valley is a typical Karst in Southwest Karst Area .Recently along with the deterioration of environment in Karst area and the worsen of rocky desertification , the ecological problem of Karst trough valley area has become the important factor that limits local development. It urgently needs to get a way of the land sustainable use , which is reasonable in ecology and feasible in technically. The way is to establish an environment-friendly land use pattern, which has the principal and aim to protect and change environment, economize and be intensive land use and use land sustainably.In this paper, the following questions to explore in depth:(1)The paper first analyses the unique Karst landscape types - Karst trough valley of the main geological and geomorphological features, which bases on the backdrop of the characteristics of Karst topography and landform type in Chongqing. Then it does some researches on the ecological environment of Karst trough valley. The rocky desertification issues attract our concern.(2)The paper summarizes the natural and economic characteristics of the study area------theBeiBei Karst trough valley. According to the research of that different land-use pattern on soil quality in groove Valley, the paper analyses the causes of limiting factors of land resources, which carry out deep-level understanding of the characteristics of land resources in the region. It provides a scientific basis to explore the land resources in a rational way.(3)According the analysis of ecological features and ecological agricultural land use suitability, the impact studies of different land use on soil quality traits, the analysis of the limiting factors for land use, the summarize of the land use status quo and characteristics in Karst trough valley, we can know for sure that although the light water and other natural conditions in this area are better, the serious soil erosion is not conducive to agricultural production activities, because of man-made factors. Then the paper analyses the unreasonable reasons for the land use, providing a most direct basis for the reasonable model and a scientific basis to optimize and manage of land use. The regional land use structure has become more reasonable and sustainable.(4)Combined with the limiting factor of regional development, the status quo of the land use, the main impact factors of land-use, the characteristics of the ecological environment as well as the analysis of unreasonable land-use in Karst trough valley, the paper divide the BeiBei Karst trough valley into three zones. And in accordance with its different eco-geographical characteristics, the paper gives them different environment-friendly land-use patterns. The three zones and patterns are: the top Karst Trough Valley region with the land use patterns mainly to protect and restore the natural ecological forest at the top of the valley; the gentle slope area (slope of 20°～30°) with land use pattern mainly to return farmland to forest and grassland also park and to protect water and soil; The karst valley lowlands in low-yielding fields with land use pattern mainly to take projects and measures to enhance the value of arable land, such as irrigation and water conservancy, changing slope into terraced field.Finally,the paper give some corresponding Countermeasures and suggestions to build environment-friendly land-use model.