Evaluation On Service Function Of Tuwan Mountainous Landscape Ecological Complex In Shapingba District, Chongqing

Mountains is the background of mountain landscape, by the interrelated components and relatively higher elevation of the landscape mosaic in the background consisting the heterogeneous mosaic, whose landscape has a vertical strip of landscape patterns, high diversity, shape complex and corridors and other characteristics of curvature. Because of human interference and altitude mountain landscape ecological change, mountain landscape in its entirety is very complicate, and its internal composition is also not the same with plain city, has its own characteristics. But, the research on the mountain landscape ecological complexes is rare at home and abroad at present, and Evaluation on service function of landscape ecological is more large-scale study, little research has been done on small and medium scale types and how each combination combined.The area, this paper selected range from shabin Rd to the ridge line of the central in Shapingba district of Chongqing. Its relative elevation is more than 100 meters, can represent the characteristics of hilly areas of Chongqing. In the study area, alone the change of altitude, selected 600m, long 500m wide plots.Using adjacent grid method, divide study area into120 samples of 50m x 50m square, According to the basic landscape ecology principles, on the basis of survey date, combined with satellite images, Judging by land use, the study area was divided into five major ecosystem types, the evaluation methods which using the combination of physical and value, on production of organic matter value in the study area, water conservation, soil, climate regulation, pollution cleaning up, research on the value of the five ecosystem services functions, and make an approach to the combination of mountain landscape complex, study results are as follows:(1) In tuwan mountainous landscape ecological complex, agricultural land(cropland) and ecological land (broad-leaved forest, bamboo forest, shrubs, grass produced a positive effect for 165,000 yuan per year, construction sites (buildings, roads and squares, industrial land) have a negative effect for the -124,000 yuan, the total effect of the overall is 41,000 yuan per year.(2) the value of the order of five mountain vegetation types services in tuwan mountain landscape ecological complex,:broad-leaved forest (52.2% of total positive value)> cropland (17.4%)> shrubs (14.6%)> grass (10.7%)> bamboo forest (5.2%).The order of the value of the five tyep of ecosystem service value is climate regulation (fixed CO2, releasing O2) (51.0%)> water conservation value (18.1%)> organic matter production value (15.6%)> Pollution Purification value (12.7%)> to keep the soil value (reduction of land loss, reduce sediment deposition both retention and value 2.6%). It clear show that the complex have very important function on carbon sequestration, maintain soil erosion, maintain soil fertility and other aspects of the important role, from the quantitative point of view.(3)Tuwan mountainous complex combination (construction land= 47.4%, farmland=11.3% broad-leaved forest=23.9%, bamboo=1.4%, thickets=7.6%,bushes=8.4 percent), the total benefits generated is 41,000 yuan>> 0, affirming its performance is good. According to the existing combination, increasing construction land, when its proportion reaching 54.5%, The services value of mountainous ecosystem complex is 0, while the complex have no positive effection on the surrounding environment, and it also go against its ecological system stability, therefore, in similar combination of tuwan mountainous ecological complex construction land proportion should be lower than 54.5%.(4)Urban forest hardly have any farmland ecosystem, then divide tuwan mountainous ecological complex into construction land and ecological land (woodland, irrigation grass land), maintain and expand the proportion of ecological land, its overall ecological benefits will also met subsequently increase. When the proportion of forestland is 35.7%, construction land is 64.3%, ecosystem service function value is 0. It have a guiding effect on the coordination of urban planning and the rational use.