| One of the most important tools for supporting land planning decisions globally,regionally or locally is to understand Land Use/Cover Change(LUCC),and the development of LUCC scenarios helps to understand a range of possible future lands.Process uncertainty and potential impacts and interactions in a changing environment.Due to its importance in several socio-economic and ecological processes,models of land use and land cover change have become more complex.Changes in land cover and land use are among the main reasons for changes in different biogeochemical and climatic processes across the globe.Studies have shown that changes in land use for agricultural use change the concentration of greenhouse gases and carbon dioxide in the atmosphere,and also affect carbon sequestration.On the other hand,changes in land cover and land use affect atmospheric circulation around the world,thus affecting the region.The climate within the range.The land-use structure of a particular region has adapted to the requirements of human society since its appearance.At present,the land-use structure has become very important.The changes in the industrial revolution and land-use structure are considered to be a very important global process.Today’s land use can be interpreted as human intervention in landscapes,where land use and land cover change are interrelated with other global processes such as global climate change,population growth,and land degradation.Land cover changes can lead to land degradation and severe global damage.Another important global process is the expansion of cities and industrial areas,with urban intensification accompanied by a significant increase in resource consumption,habitat fragmentation and biodiversity loss.Land cover change has had a major impact on the state and integrity of ecosystems and their ability to provide ecosystem services.Multiple land-use changes are affecting hydrological conditions in many parts of the world,urbanization processes,changes in industrial patterns,and related government policies.Driven land use change is the main cause of changes in regional hydrological conditions.Some studies have shown that land use impacts may also be combined with other impacts,such as climate change and natural rate of change.Therefore,studying land use change is also an important way to reveal environmental changes in the Earth’s region.Land use change is the link between human and nature,the same impact and the most intimate interaction.This paper uses mathematical models and statistical methods to deeply study the response of land use change in Aba Prefecture,Sichuan Province,in order to plan and manage the land use in the future development planning of Aba Prefecture and other similar cities in the later period.Through the above analysis of relevant results,the following conclusions are drawn:(1)In 2016,the total land area of Malcolm,Zoige and Wenchuan in Aba Prefecture was 662581.49 hm~2,1032549.56 hm~2 and 408432.57 hm~2,respectively.The garden area accounts for the smallest proportion,accounting for only 0.04%of the total area of Malcolm,and the garden area is 240.29 hm~2.The total area of Ruoergai arable land is4171.25 hm~2,accounting for 0.40%of the total area;the land use type of no-land land in the Zoige area in 2016;the total area of forest land is 234412.73 hm~2,which is the largest land use type in Zoige,accounting for 22.7%.In 2016,the land use type of Wenchuan accounted for a different proportion of the total area of Wenchuan.The area of garden and transportation land was the smallest,and the area was 809.91 hm~2 and 821.99 hm~2,accounting for 0.20%.(2)In terms of the extent of land use type change,the land use types of Malcol,Zoige and Wenchuan in Aba Prefecture have changed to varying degrees during 2013-2016.In2013-2016,the area of cultivated land,woodland,grassland,transportation land and other land areas of Malcolon decreased to varying degrees,with reductions of-0.0491%,0.0004%,-0.0001%,-0.0194%and-0.0012%,respectively.There was no significant change in the area of waters and water conservancy facilities,and the area of urban and industrial and mining land increased to a certain extent,with a growth rate of 0.5136%.In the past four years,the area of arable land,towns,industrial and mining land and transportation land has increased to varying degrees,with changes of 0.0242%,5.0271%and 1.5534%,respectively.There were also different magnitudes of decline,-100%,-0.0010%,-0.0277%,-0.0027%,and-0.0057%,respectively.In 2013-2016,Wenchuan’s cultivated land,garden land,woodland,grassland and other land areas declined,with changes of-0.1602%,-0.2684%,-0.0021%,-0.0071%,and-0.0052%,respectively.(3)During 2013-2016,the land use concentration of Malcolon,Zoige and Wenchuan in Aba Prefecture changed differently.The dynamic degree of cultivated land,forest land,transportation land and other land in Malkan was less than 0,garden,grassland and water area.The dynamic degree of land use for water conservancy facilities is 0,and the dynamic degree of only towns and industrial and mining land is greater than zero.The 2013 and2016 land,forest,grassland,water and water conservancy facilities and other land dynamics were-25%,-0.0003%,-0.0069%,-0.0007%and-0.0014%,respectively,while cultivated land,towns and industrial and mining sites The dynamics of transportation and land use were 0.0061%,1.2568%and 0.3883%,respectively.The dynamics of land use in Wenchuan towns and industrial and mining areas,transportation land and waters and water conservancy facilities in Aba Prefecture are positive,which are 0.2125%,0.1115%and0.0152%respectively.The dynamics of cultivated land,garden land,forest land,grassland and other land are respectively-0.0401%,-0.0671%,-0.0005%,-0.0018%,and-0.0013%.The comprehensive land use index of Markan,Zoige and Wenchuan in Aba Prefecture showed a slow upward trend during 2013-2016.The Malcolm Land Use Comprehensive Index reached a maximum of 195.43 in 2015 and 2016,and the highest in 2016,189.46and 189.75 respectively.In 2013-2016,there was no significant change in the land use type diversification index of Aba Prefecture.In terms of the land use type dominance index,the Malcolm land use type dominance index is higher than Zoige and Wenchuan in four years,and the dominance stability is better.The land use type uniformity index of Zoige from Aba Prefecture during 2013 to 2016 was higher than that of the same period of Malcolm and Wenchuan,and reached a maximum of 44.86 in 2016. |
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