| Urbanization process has become a universal phenomenon in the world,and even become a major problem in the development of many cities.The correct description of urban land use landscape pattern can not only fully understand the causes and effects of urbanization,but also reflect the impact of human potential activities on urban environment and ecology.Therefore,the study of the characteristics of landscape pattern of land use,the changes of landscape types and landscape pattern change rule and reason of the changes can be effective to guide future urban development and construction,establishing scientific and reasonable district development plan,implementation suxian district resources reasonable use and the sustainable development of social economic and ecological environment for suxian.Based on the Landsat TM and ETM remote sensing images and the natural and social economic data in 2001,2011 and 2018 in Suxian District of Chenzhou City,this study interprets the remote sensing images and obtains the landscape type distribution map in this area by comprehensively applying the relevant theories and methods of RS/GIS and landscape ecology.By means of literature review,field investigation and mathematical statistics,landscape pattern index,landscape dynamic attitude index,topographic potential index,area transfer matrix,land use distribution index,geo-information graph and Logistic regression model were used to study the spatiotemporal evolution characteristics and rules of landscape pattern in Suxian District during 17 years.The driving factors of spatial occurrence probability of each landscape type were analyzed,and the distribution of landscape pattern in Suxian District was predicted by Ca-Markov model.The results are as follows:(1)During the study period,all landscape types have changed to different degrees.The substrate of Su Xian District consists of arable land and forest land,with forest land having an absolute advantage,accounting for more than 50%,Chenjiang River,Dongjiang River and their tributaries as corridors,and construction land and unused as the main patches.2001-2011,the main transfer type is the area of forest land and arable land converting to each other,with a small amount of area of grassland,construction land and water transferred in,and the area of unused land transferred out the most.From 2011 to 2018,the area of construction land increased the most,grassland had a small increase,and arable land,forest land,watershed and unused land all shifted out.The single dynamic attitude of the construction land changed up to 9.62%,the fastest rate of change compared with other types,and the type of change of the integrated landscape dynamic attitude in both phases of the study area was very slow change,decreasing from 1.50%to 1.43%,and the stability of the landscape type increased.The fragmentation of forest land is reduced,the shape tends to be complex and separated,the boundary of cultivated land is more irregularly divided by man,the construction land is expanding under the will of man-made planning and forms a"central cluster,peripheral scattered" layout,the shape of grassland is more regular and discrete but the type of green space is getting richer,the original water area is shrinking while new water area is artificially In 2018,the Shannon diversity index of the overall landscape of Su Xian District increased to 1.15,the Shannon uniformity index increased to 0.64,and the spreading index decreased to 43.35,with the aggregation degree first increasing and then decreasing,and the landscape separation degree first decreasing and then increasing.The range of topographic position index in the region of Susen District is 0.076-1.512,and its main topographic gradient is the low to medium level.Among them,the dominant area of forest land is evolving from high to low,the dominant area of arable land is evolving from low to high,there is competition between the dominant area of construction land and arable land,the dominant area of grassland is expanding,and the watershed landscape is mainly concentrated in the area of low topographic position.The mapping change pattern of landscape types is mainly "stable" and distributed in all regions,with"woodland-forestland-forestland" as the main mapping type.(2)The analysis of landscape pattern driving factors shows that the main landscape types affecting the change of landscape pattern in the study area are cropland,construction land and woodland.The evolution process is the result of the combined effect of natural,socio-economic and policy factors.Natural factors affect more forest land,grassland,arable land and water area,while socio-economic factors affect more construction land and unused land.Among them,forest land is mainly influenced by terrain and GDP,grassland is mainly influenced by climate and topography,construction land is mainly influenced by intensity of human activities and population,arable land is mainly influenced by environment and market demand,watershed is mainly influenced by natural water system,and unused land is mainly influenced by topography and roads.(3)The results of CA-Markov model simulation show that the area of landscape of construction land,grassland,water and unused land in the study area will increase in 2025,while the area of cultivated land and woodland will decrease slightly.The variation range of these landscapes is small,indicating that the change of landscape structure tends to be stable in 2025. |
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