Construction Of Ecological Corridor In The Southern Mountain Region Of Jinan

The rational exploitation and protection of southern mountain region in Jinan City possess important ecological significance. In the recent years, the incessant exploitation has aggravated the landscape fragmentation which has become the origin of kinds of environmental problems and posses significant impact both on biological diversity and the spring water supply capacity as well as soil erosion and other aspects. while the construction of Ecological Corridor has important ecological significance, generally, the corridors posses five functions including Habitat, Filter or Barrier, Conduit, Source and Sink. Ecological Corridor has many functions including the conservation of biological diversity, Ecological Corridors, filter pollutants, preventing soil erosion, sand-fixing, controlling floods and other features. Therefore, a reasonable construction of the Ecological Corridor of Jinan in the southern mountainous area posses great ecological significance.The paper selected the reasonable classification method of Ecological Corridors, based on the actual situation of the southern mountain region in Jinan, The Ecological Corridor of the southern mountain region in Jinan is divided into three categories: roads Ecological Corridors, rivers Ecological Corridors and ridges Ecological Corridors. At the same time, according to terrain, the southern mountainous region was divided into two regions namely Luquan river basin, Jinxiu river basin which were constructed respectively. Quanlu river basin , Jinxiu river basin ,Jinyun river basin and Jinyang river basin were taken as mountain region when constructed, while other areas in the study area were taken as plain areas.The main research contents are as follows:(1) Basing on the establishment of land-use classification system, ETM remote sensing images of southern mountain region in Jinan in 2004 were interpreted by the use of RS and GIS, moreover the land-use databases were established. According to topographic maps and land use map, the roads ecological corridor, rivers ecological corridor and ridges ecological corridor were extracted by arcview3.3.(2) Determining the reasonable width of ecological corridor According to the study aims:A reasonable width of roads Ecological corridor in the study area was determined according to road grades,it requires that the width of road ecological corridor is more than 60m due to complex terrain, large slop on both sides of the road in mountain areas ; the area within 200m which is the range of human visual acuity is the most sensitive areas, meanwhile, 200m can meet the requirement of animal's movement and communication and soil conservation, therefore, the east section of express highway circling city that cave forest park, Liubu nature reserve section of provincial highway S103, the reasonable width of roads ecological corridors is 200m,while with high standard green building. The reasonable width of rivers ecological corridor in the study area is determined by many kinds of factors.In the mountain areas ,for steep terrain and steep slope,so refer to Xia yujiu's mathmatical simulation fitting to establish the width of riparian forest buffers,its width is calculated as follows: F=10+0.03S2.F is the width of the river buffer,S is the slope.so the mountain river corridors identified as 251m.In the plain area,the width of the river ecological corridors select the currently widely used in 30m.And make reasonable construction based on the river flows through the different functional areas.The reasonable width of the ridge ecological corridors in the study area,the effective area of 75% forest above of the altitude of 350m.In order to connect the major forest patches betterly,and reference to previous experience,slected more than 350m above sea level as the ridge of the regional ecological corridor area.(3) The construction of ecological corridorsFirst select the shape index of ecological corridor R, ecological corridor density(m/km~2), the node density(个/100km~2), connectivity and degree ring index to analysis Jinan Southern Mountain Corridor . The max of density of ecological corridor density is the road ecological corridors,reached to 196.16 m/km~2.the ecological corredor density of River Ecological Corridor and the density of the ridge ecological corridor were 148.61 m/km~2and 114.23 m/km~2; but they has the same node density as an average of 0.96个/ 100km 2. the connectivity of the road ecological corridor of ecological corridor for the maximum,is 0.37.The construction of Ecological corridor in study area should combined with the type of soil, topography , made construction of the ecological corridor of the specific program. Ecological corridor where the construction of the ridge of the study area by land use types in 2004, map and topographic map overlay analysis of different slope, upward slope farmland, woodland, grassland and barren lands to the statistical analysis. According to statistical analysis of the results made the specific building programs.