| Land is the basic place for human survival and development and is the basic way for human to transform the natural environment.However,with the prominent contradiction between man and land,the state of land use landscape pattern has been gradually concerned by scholars.Therefore,it is of great practical significance to carry out deep-seated analysis and simulation of land use landscape pattern for the optimization of land use landscape pattern,the harmony of man-land relationship,the realization of green economy and the scientific and rational formulation of land use policy.This study is obtained by remote sensing interpretation to get four land use type maps of Yongchuan area.Landscape software was used to analyze land use landscape pattern and land use function zoning in Yongchuan District.Firstly,on the slope,the DEM data and the land use landscape data of each period are superimposed to analyze the landscape hierarchy and category hierarchy and historic significance of the land use landscape pattern of each slope area;second,the administrative center and traffic buffer area of Yongchuan District are superimposed with the land use landscape data of the 4th phase.Finally,by using the landscape index method and Arcgis software,the difference of land use landscape pattern between 2005 and 2015 in Yongchuan District was studied and the land use function zoning was carried out.The results are as follows:(1)The spatial and temporal changes of land use quantity structure in Yongchuan area are significant.From 2000 to 2015,cultivated land and woodland were the main land types in Yongchuan District,and the landscape area of construction land showed a growing trend and rapid growth.Class hierarchy level index shows that the degree of fragmentation of construction land landscape is aggravated,but it is developed in a state of aggregation;the fragmentation of woodland and cultivated land landscape is decreasing,and the shape becomes regular gradually,but the degree of aggregation decreases.Landscape level index shows that the heterogeneity of landscape in this area increased from 2000 to 2015,but the landscape tends to be stable and diversified.(2)There are obvious differences in landscape pattern from slope dimension.(1)Through the comparison of different slope areas,it is found that the cultivated land area of 0° to 2° slope area accounts for the largest proportion in 2000-2015,but the cultivated land area increases slowly and negatively due to the development of social economy.The construction land area accounts for the largest proportion in other slope areas from 2° to 15° slope area,and the forest land accounts for the largest proportion.The landscape level index shows that the cultivated land landscape is regularly distributed in the area of 0° to 25° and the landscape patches of woodland and construction land are fragmented,but the degree of concentration of woodland and construction land is gradually increasing;In the area of slope greater than 25°,it is mainly the forest land distribution area,so the area should pay attention to the protection of ecological environment and biodiversity,and ensure the quality of forests.(2)Under the extremely significant level(a=0.01),the landscape pattern of Yongchuan District changed significantly from 2000 to 2015.From the historical significance of each slope area,except 2010-2015,the change of slope area above 15°degrees is not obvious,but the change of every slope area in other periods is significant,mainly because of the early emphasis on economic development and infrastructure improvement,while the contemporary society pays more attention to the unity of ecological,social and economic benefits.(3)The changes of topography,transportation,administrative region and population economy have a great impact on the distribution of land use landscape pattern.The natural factors are dominated by terrain,and are affected by terrain.The cultivated land is mainly distributed in the range of 0°to 15°.Construction land mainly distributes in the range of 2 to 15.Forest land mainly distributes in the range of 25° or above.Social economy is dominated by traffic and administrative areas.Under the influence of traffic,a large number of farmland will be converted into construction land.Under the influence of administrative areas,the area of construction land is more and more widely distributed.Generally speaking,with the development of social economy,the improvement of transportation facilities,the expansion of urban area and population,more and more cultivated land will be converted into construction land and the cultivated land area will drop sharply.Therefore,we must pay attention to the protection of cultivated land,and completely adhere to the red line of cultivated land in future land use planning.(4)From 2005 to 2015,there were significant differences in land use landscapepattern between towns in Yongchuan District.From 2005 to 2015,the patch shape of Yongchuan area is relatively regular on the whole,but with the development of social economy and the demand of urban expansion,the original state of land use patches is affected to varying degrees.Specifically,the patch shape of the regional center or sub-center is irregular and the landscape fragmentation degree is relatively high.In the region with primitive agricultural development as the main industry,the implementation of land consolidation methods such as gradient upgrading,scattered land consolidation,disaster prevention and control makes the landscape fragmentation degree of the region reduced,and the landscape is clustered development.(5)Considering the impacts of social economy,natural ecology and original landscape pattern on land use,Yongchuan District is divided into four functional areas by hot spot analysis: highly intensive land use functional areas,land use functional areas with consideration of both utilization and utilization,land use functional areas with protection and utilization,and land use protection areas with fragile ecological environment. |
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