Study On Gradient Changes Of Landscape Pattern In Urban-rural Ecotone Of Hai Kou City

Urban-rural fringe is a transition zone between urban and rural areas.The paper taking Haikou City’s 2000,2008,2015 remote sensing data as a data source, using visual interpretation and supervised classification method to interpret image, then get three landscape types Vector,Based on the gravity model, by constructing the index system, Use ArcGIS 10.2, to define the spatial extent of Haikou City in 2000,2008, 2015 three periods of urban-rural fringe respectively,Using Landscape pattern index’s size and amplitude effect curves, the area of conservation of information law to determine the appropriate size and amplitude.Using buffers method to set the respective periods gradient zone. Selecting six landscape indexs respectively on the landscape types level and the landscape level, analysis the gradient zone’s changing characteristics of landscape pattern..The conclusion as follows:(1) In 2000,the spatial extent of rural-urban fringe includes most of Haixiu and Chengxi town,the eastern changliu, southeastern Fucheng town, Lingshan town’s central region, the western region of Longtang Town, north of Longquan Town, northeastern Longqiao towns Yongxing town and Shishan town; In 2008,the spatial extent of rural-urban fringe major increase in the part of the Zuntan town、 Yanfeng town、Hongqi town、 Jiuzhou town、 Sanjiang town and the whole Yunlong town.In 2015,the spatial extent of rural-urban fringe major increase in the part of Zuntang town and Jiuzhou town.Haikou’s rural-urban fringe break the administrative boundaries of restraint, more in line with the natural properties of the urbanization process.(2) Analysis of the landscape pattern index’s size effect and scale effect. Determine that 90m is the appropriate size of the study area landscape patterns.The Suitable buffer radius interval is [2257m,3385m].it can retain gradient feature, and also can allow landscape index relatively large fluctuations do not appear at the same time.(3) Within the scope of research time,the main types of landscape of HaiKou’s rural-urban fringe is agricultural land and forest land.Agricultule land and Forestland cross distribution, lesser extent by other fragmented landscape. Landscape shape complex, landscape has higher degree of agglomeration and stability(4) 2000-2015, due to the uneven distribution of the various types of landscape in space,the Landscape Pattern of Haikou City showed significant differences from the middle to both sides of the gradient, the degree of the diversity of the landscape, increase,the landscape spatial pattern performance the gradual homogenization and dispersion trend. It because of the river, where the mosaic of land for construction, so the landscape pattern has banded structure or ring structure features.(5) 2000-2015,in the gradient I-III what is close to the city agriculture land is landscape matrix, after gradient zone IV forest landscape becomes the matrix of landscape instead agricultural land.Agricultural land in the gradient band has gathered-Broken-Agglomeration distribution. With the exception of lineament push each affected city landscape radiation decreases, the degree of diversity of the landscape reduce,the landscape level gathering, landscape’s naturally connectivity rise, fragmentation decreased, landscape shape became complicated. Over time, the degree of human disturbance increased, the proportion of landscape types tended to balance, in addition to construction land has gradually gathering trends, the rest of the landscape fragmentation increased.(6) Based the use of GM (1.1) model, predict the area of each landscape types of Haikou City’s urban and rural area in 2023, the result shows thar between2015 and 2023, agricultural land and construction land increased considerably, and forest land at the gentle, rural Ecotone range further expansion. In order to prevent blind expansion in Crisscross range, according to the gradient feature Haikou rural Ecotone landscape pattern and rural Ecotone range of developments, proposed set up limited development area, establish reasonable urban and rural land use patterns landscape Pattern coordinated development strategy.