Dynamic Analysis Of Land Use And Landscape Pattern Changes Of Dongchangfu District,liaocheng,in The Last 30 Years

Land use / land cover evolution has an important impact on the regional ecological environment,and it influences the global environmental change in the form of accumulation.The analysis of the land use changes,landscape pattern evolution,and their driving factors,is helpful to understand the cause of the earth's ecological system's service and function changes,and has important guidance for the sustainable development of the region.Based on remote sensing and GIS technology,we studied the land use and landscape changes of Dongchangfu District,Liaocheng City,in the past 30 years.According to the actual land use situation of the study area,Dongchangfu District is divided into seven kinds of land use types including urban land acquisition land,cultivated land,traffic land,village land,water and water conservancy facilities land,garden land and unused land.According to the land classification system,remote sensing images of the study area in 1987,1997,2007 and 2016 were classified.We discussed the land use change process and range of Dongchangfu District from the aspects of the increasement,reduction and the relative dynamic degree of land use.We also used the landscape index research method to quantitatively analyze the landscape pattern of the study area.The main contents and results of this paper are as following:(1)The proportion of each land type.In the past 30 years,the main landscape of Dongchangfu District is cultivated land,which accounts for more than 64% proportion of the region.Village land accountsfor more than 13% of the Dongchangfu area;while waters and water conservancy facilities land,Garden land and traffic area accounts for relatively small proportions,which are 3.58%,3.26%,1.82% respectively.The proportion of unused land and urban area is fluctuating dramatically in the range of 0%-17.24% and 1.80%-12.26% respectively.(2)Land use transformation.The unused land has the largest reduction,which was 248.59 km2 in 1987 and reduced to 0 in 2007,it changed most sharply converting to the cultivated land,the total converting area was 214.73 km2..The urban mining land increases the most,which was 25.88km2 in 1987 and increased to 176.80 km2 in 2016,the largest converting land type is cultivated land,which has converted up to 89.77km2.In addition,while comparing the Relative dynamic degree of land use between 1987 and 2016,the urban land and mining land is the largest and is 20.36%;and the following is the garden land(15.88%),which indicates that the conversion between the garden land and other land types was also higher than that of the other land types.(3)Land use conversion rate.The relative dynamic degree of land use can describe the change range,the urban land and mining land increased first and then decreased,and the land use of the village was reduced,and the other five types of land use were gradually reduced.Meanwhile,in 1987-1997,1997-2007 and 2007-2016 the land conversion area is 412.63km2,313.69km2,271.67km2 respectively,which decreased in sequence.The extent of land use change more and more weak of Dongchangfu District in latest 30 Years.(4)Landscape pattern evolution.In the past 30 years,the expansions index and cohesion index rose from 63.35 and 99.47 to 64.14 and 99.63,and then decreased to 62.44 and 99.39 respectively.The splitting index reduced from 8.92 to 7.34 and then increased to 10.41.It indicated that landscape followed "gathering-scattered" evolution pattern,the degree of landscape fragmentation increased.The PAFRAC is 1.31 and falls to 1.26,and then rises to 1.27.The landscape shape index decreased from 50.75 to 32.93,but the late decline was greatly reduced,indicating that the landscape shape of the whole area was "simplification-adjustment period" evolution pattern,Landscape shape has a trend of complexity.Shannon index and evenness index decreased from 1.28 and 0.62 to 1.27 and 0.61,after a period of adjustment,rose to 1.28 and 0.66;indicating that the diversity of landscape followed "simplification-adjustment period-rich" evolution pattern and landscape was more abundant and balanced.Overall,Dongchangfu District landscape ecological structure tends to healthy and reasonable direction.