| With 14 cities and counties(banners)of Horqin sandy land as research areas,this thesis explored the change degree of regional land use,revealed the law of land use succession,and found out the mobilization between all land types with method of spatial pattern analysis for land use succession by means of ArcGIS and data source with purpose of providing a basic theoretical basis for adjustment of land use structure and optimization of land use pattern in research areas and providing references for reasonable use of land in research areas.On the basis of obtaining all land use types of research areas,this thesis classified the site types on a regional scale for the main site types(forest land,sandy land and grassland)and mastered the differential characteristics of all site types,which provided a basic theoretical guidance for afforestation and“arbor,shrub and grass close-to-nature configuration”of research areas and had an important practical significance for“forest land,sandy land and grassland”comprehensive treatment of research areas.The main research contents are as follows:(1)Land use status of research areas in 2020:There were about 116335km~2land in research areas.The distribution areas of all land types from high to low:grassland>cultivated land>forest land>sandy land>unused land>construction land>water area>bottom land.which respectively accounted for 38.46%,27.05%,16.15%,8.05%,6.23%,2.41%,1.01%and0.64%.(2)Changes of single land use dynamic degree in research areas:the rate of change of all land types showed a trend of“both decrease and increase”.Cultivated land,forest land,bottomland,construction land and sandy land had positive K values with increase rate of respectively 2.79%,6.25%,1.02%,1.80%and 0.59%.Grassland,water area and unused land had negative K values with increase rate of respectively-2.46%,-2.63%and-0.17%.(3)Changes of land use spatial pattern in research areas:there were mutual transfers between all land types in 30 years.The transfer-out area of grassland was 24947.7km~2which was the biggest.The transfer-out area of cultivated land was 6212.7km~2which was the second biggest,and the cultivated land was mainly transferred to forest land and grassland.The transfer-in area of forest land was 10491.0km~2which was much greater than the transfer-out area of 3269.7km~2.The sandy land changed slightly and its area was in a stable and balanced state.The areas of bottomland and construction land showed a trend of expanding,while the area of water area showed a trend of decreasing year by year.(4)Classification of site types:This paper classified the site types of forest land,sandy land and grassland in research areas.Forest land was classified into high vegetation coverage forest land,medium vegetation coverage forest land and low vegetation coverage forest land;sandy land was classified into fixed sandy land,semi-fixed sandy land and shifting sandy land;grassland was classified into high vegetation coverage grassland,medium vegetation coverage grassland and low vegetation coverage grassland.The distribution,vegetation types,mean annual precipitation and soil conditions differential characteristics of all site types were discussed respectively. |
