| Land,as the basic site for human survival and development,is the basis for human beings to live and produce,and it's also the basic way for humans to change nature.Nowadays,the contradictions between people and land in the world are prominent,and issues such as land-use landscape are increasingly attracted the attention of scholars.The optimization and upgrading of the landscape pattern and the realization of the harmonious development of man and land are important issues to be resolved in today's society.It has important practical significance for promoting the green economy and realizing sustainable land development.In this study,the Yubei District of Chongqing City with a special landform of Shancheng City was taken as the research object.After preprocessing the 4 remote sensing images in this study area of 2000,2005,2010,and 2015,using the combination of supervised classification and unsupervised classification,the ROI of each land use landscape was extracted and interpreted,explain a map of land use landscape types containing 6 landscape types,including cultivated land,construction land,woodland,water area,grasslands and unused land.Using landscape analysis software,the land use landscape pattern in Yubei District was calculated and analyzed.From the two landscape levels,11 landscape indices were selected for calculation and analysis.In the dimension,the extracted elevation information and slope information are superimposed with the land use landscape type maps of each year by means of DEM data,and the characteristics of landscape changes under different elevations and slopes are analyzed.At the same time,the topographic index used to comprehensively analyze topographic features was constructed to study the distribution of landscape indices on the topography.Using the moving window method and gradient analysis method in landscape software,the spatial pattern and internal level differences of landscape fragmentation in various years were studied.Finally,based on the landscape pattern of land use in Yubei District in 2015,the land use landscape pattern of Yubei District in 2020 was simulated and forecasted,and combined with the existing research results in Yubei District,the future urban planning of Yubei District was conducted.Suggest countermeasures.The results of the combined study are as follows:(1)Landscape types mainly consist of cultivated land and forest land.These two types of landscapes account for more than 70% of the total area of the entire area.Landscapes for construction land use have increased rapidly.The proportion of construction land has increased from 13.43% in 2000 to 25.49% in 2015,rapidly growth.The degree of fragmentation of land for construction use has declined,and there has been an aggregation trend,and the degree of fragmentation of cultivated land and forest landscape has increased.From the landscape level,the distribution of all kinds of patches becomes increasingly unbalanced,the degree of landscape heterogeneity increases,the degree of aggregation of various landscapes decreases,the degree of connectivity between landscapes also decreases,and the landscape develops towards diversification.(2)The landscape pattern is also significantly different in terms of dimensions.In terms of elevation,the waters are mainly distributed in the areas with the lowest elevations.The construction land and cultivated land are distributed in the middle elevation,and the higher proportion of the forest lands with higher elevations.The regular shape of patch shape is inverted "U" shape,the most irregular from 200 m to 400 m,then began to decline;with the elevation of the patch,the connectivity of the patch showed an upward trend;landscape heterogeneity gradually decreased with increasing elevation,all kinds of landscape The degree of unevenness in plaque ratio increases.In terms of slope,the maximum distribution ratio of the water area below 2°,the cultivated land and construction land are mainly distributed in the slope area below 15°.As the elevation increases,the landscape proportion of forest land becomes higher and higher,and the slope is greater than 15°.Woodland landscape has become the largest landscape type in Yubei District.In the 6° to 15° region,the patch of landscape was the most irregular and the degree of discrepancy was the highest from 15° to 25°.With the increase of slope,the connectivity between the patches in the Yubei District was better.In the topography,woodland,grassland,and unused land are conducive to distribution in the areas with the highest elevations.Arable land and water areas are conducive to distribution in lower elevation areas.The construction land has the highest suitability for distribution,and it is located in the topography,middle terrain,and high topography.There is distribution.This distribution phenomenon is in line with the general distribution of land use landscapes.(3)The pattern of regional differentiation of landscape pattern in Yubei District is obvious.In the southern part of Yubei District,there is a comprehensive industrial development zone in the city.The urban construction and urban development in the region have developed to a relatively stable level.Therefore,the degree of fragmentation of the landscape has decreased year by year,and the patches have shown a trend of aggregation,while the Yubei District's northern region Mainly for the industrial development zone and the industrial-brigade-agricultural comprehensive development zone,due to the dramatic changes in land use,the degree of fragmentation is increasing year by year and the connectivity of the landscape is deteriorating.In the three parallel mountainous regions in the Yubei District,the woodland landscapes in the mountain topography are the main landscape types.Therefore,these regions are the comprehensive development areas for ecological agriculture and tourism.The arable land landscape and the woodland landscape are strictly protected and are guided by the planning to the rural areas.Residents' points are concentrated in construction,and the degree of landscape fragmentation is also low.(4)Study on landslide landscape pattern simulation and prediction in Yubei District.Through the establishment of the CA-Markov model,the quantitative and spatial simulation prediction of the landscape pattern of land use in Yubei District in 2020 shows that: the landscape changes of cultivated land and construction land in the Yubei District are the most dramatic,and the proportion of cultivated land landscape has declined year by year.The proportion of land use landscapes has increased year by year.The overall landscape shows a decrease in the degree of fragmentation and an increase in the degree of aggregation.The patch shape shows a regular development.Through the analysis of this forecasting result,the following suggestions are made for sustainable land use development in Yubei District: First,continue to strictly implement the overall regional land use planning;second,optimize the spatial layout of land use and land function zoning;again,increase the The management and control of land for landscape use and cultivated land in the area of construction;Finally,the dynamic monitoring and law enforcement supervision of land use shall be strengthened. |
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