The Influential threshold of Road Network Impact on the Ecosystem in Last Years Based on Grid
The data of land cover type of 2000 and 2010 was from the project of remote sensing survey and evaluation of national ecological environment changes during ten years ( 2000-2010 years ) , The road net data was from Chinese traffic network. Based on the ARCGIS grid analysis method, The Peason correlation coefficient of road network density and Ecological system transformation with whole scale at 1kmx1km、 2km×2km…10km×10km was calculated. Combined with the DEM data of Jiangxi Province in 2010, the topography ( elevation, slope and aspect) features of the ecosystem change was analysed, and the road network density threshold of the ecosystem change was calculated. The results show that: ( 1 ) The land use change impacted by road network were Forest to construction, farmland to construction, forest to grass land, forest to farmland and farmland to forest. The Altitude was 167~291m、 112~221m、 367~422m、 267~306m和180~273m, The slope range was 0°~2°(flat), it shows that human activities are mainly concentrated in the region of low slope; The slope range was 175°~195° ( South) , it shows that the land use changes mainly active in the southern direction explained by social factors; The road network density threshold impacted by road networks was 0. 98~1. 82km/km2 , 0. 98~2. 22km/km2 , 0. 77~1. 20km/km2 , 0. 93~1. 38km/km2 , 0. 95~1. 43km/km2 , road network density effected by land use conversion decreased firstly, tends to be constant after the 2km, it shows that the scale is bigger, influence of land use conversion caused by road network was small, but will not disappear.
国家科技期刊平台
NSTL
万方数据
维普
