Changes Of Land Use Types And Characteristics Of Ecological Service In Six Northeast District And Counties Of Chongqing

The six counties are located in the northeast of Chongqing in the Flows of Da Ba mountain,belonging to one of 34 biodiversity hotspots in the world,and it is an important ecological barrier of the three gorges reservoir area in our country,and it is also the most important ecological function areas with many state-level protection zone and ecological park.In this paper,combined earth remote sensing data of the 2000,2005 and 2010 years with the field survey,we divided land into the forest,bringing land,grassland,farmland,water area,town,and bare land and analyzed the area changes of land with Arcgis10.0,Statistical Product and Service Solutions.According to the research results of the ecological service value of ecosystem by Xie gaodi and others in our country,the land transfer matrix,land use dynamic degree of a single land type,land use dynamic degree,comprehensive land use dynamic degree,state index of land use,degree index of land use,ecological service value,the ecological value of sensitivity were used to study the dynamic changes of land use and the change of ecological service value in the northeast of Chongqing.The result shows,the main Ecological landscape in the study area are the forest,bringing,farmland.The speed of increase was slowing down in the forest,cities and town.The speed of increase was speeding up in the bringing and the grass.The change of water area was impacted by The Yangtze River.The speed of decrease was speeding up in the farmland bare land.There is a significant differences in the land change of different types of land.The biggest change was occurred in the farmland,and the second was the forest and the bringing.The changing rate of the whole area of land was slower.The land use degree gradually declined which meant that the land use of recession,but the bidirectional flow of Land was speeding up,and the balance was fall.The result of Land use dynamic degree of A single land type and land use dynamic degree show that the value of them in the 2005-2010years is greater than2000-2005years,which means the land use rate is gradually accelerated.The imbalance of land use is also growing.In the study area,the ecological value increased year by year,each county land value service life all showed a trend of increasing,and the whole area of the ecological service value increases to 2.03×10¹⁰ yuan from 1.89×10¹⁰ yuan.Nine ecological service function,service function of food production value decreased,the largest reduction of Fengjie county,where the reduction is minimal.The remaining eight service functions are on the rise,the value of gas regulation,climate regulation,biodiversity conservation and soil formation and protection function of value increase.The added value of ecosystem service value change size is between counties where Wuxi>Fengjie>Yunyang>Wushan>Kaizhou county.The change of ecological service value of forest has a magnifying effect on the value change of the whole study area,but this kind of amplification effect is weakened,and farmland is contrary to this,which has the effect of narrowing and enhancing.The change of the ecological value of the grassland and the grassland changed from the narrowing effect to the enlargement effect.The effect of changes in the value of ecological services on the value of the study area is affected by the Yangtze River.In Wushan,Yunyang and Fengjie the Yangtze River flows through the territory of the territory showed magnification effect,and in Wuxi,Kaizhou and Chengkou showing a narrowing effect.