| The study on land use/cover change and its driving force is still a hot spot in the current global land change research.It is of great significance to carry out research on land use/cover change and driving force in different types of counties,so as to understand land use change and its internal driving reasons,and then provide reference basis for urban development.This study selected Jinsha county as study area,which is located in northwest Guizhou province.Jinsha county as the strong eastern economic county of Bijie city has relatively backward economic development and poor geographical environment.Through the use of 6 periods(1990,1995,2000,2005,2010,2015)remote sensing images in the study area,based on ENVI5.1,Arc GIS10.5 and SPSS23.0 data processing and analysis platform,a series of analyses were carried out on the dynamic attitude and driving force of land use/cover types in Jinsha county from 1990 to 2015 by using the transfer matrix of land use/cover change,land use/cover change dynamic model,principal component analysis and correlation analysis method.The results show that:(1)From 1990 to 2015,cultivated land and forest land were the main land use types in Jinsha county,accounting for 94.52% on average.The least occupied land use is unused land,with an average of only 0.02%.The average proportion of each land use type is ranked from high to low as follows: cultivated land > forest land > grassland > water area > construction land > unused land.In addition,during this period,the area of forest land,construction land and water area increased,while the area of cultivated land,grassland and unused land decreased.On the whole,the land use change in the study area is ranked from high to low according to the absolute value of area change: grassland > forest land > construction land > cultivated land > unused land > water area.The absolute value of area change is 17.89km2,16.74km2,10.58km2,9.98km2,0.56 km2 and 0.01km2,respectively.Meanwhile,the change of grassland was the largest,and the change of unused land was the smallest.(2)During the study period,all types of land use in Jinsha county have changed to a certain extent,and the transfer changes of cultivated land,forest land,grassland and construction land are obvious.The transfer direction of cultivated land is construction land and forest land with the transfer area of 0.73km2 and 0.08km2 respectively.The transfer direction of forest land is mainly arable land with the transfer area of 1.58km2.The transferred sources of cultivated land are construction land and forest land,and the transferred areas are 0.01km2 and 1.58km2 respectively.The transferred source of forest land is cultivated land with the transferred area of 0.08km2.The main direction of grassland turning out and into is forestland,and the turning direction of construction land is mainly arable land.In addition,there is a specific spatial distribution feature of land use/cover transfer change in Jinsha county.From 1990 to 1995 and from 1995 to 2000,the transfer change of land use type mainly occurred in the middle and east of the study area,involving few other towns.From 2000 to 2015,the transfer and change of land use types spread from the middle and east of the study area to each towns in the whole study area.Among them,the transfer of construction land mainly occurred in Pingba town,Datian town,Xinhua town,Xiluo street,Guchang street,Yankong town,Chayuan town,Mukong town,Sandu town,which all are located around the county seat,with good social and economic development and large population changes.The transfer of forestland covered most towns and villages in the study area.(3)The result of dynamic attitude analysis shows that,from 1990 to 1995,the dynamic attitude of each land use type was relatively low.Except that the construction land area increased by 0.02km2 with the single dynamic attitude of 0.1%,there was no significant change of other land use types.From 1995 to 2000,the single dynamic attitude of cultivated land and unused land was still 0.The single dynamic attitude of woodland and grassland was-0.03%,and the single dynamic attitude of construction land was 3.14%.From 2000 to 2005,the single dynamic attitude of cultivated land and construction land was 0,and the single dynamic attitude of forest land,grassland,water area and unused land was 0.30%,3.37%,-0.02% and-0.48% respectively.From 2005 to 2010,the single dynamic attitude of cultivated land and unused land was 0,and the single dynamic attitude of forest land,grassland,water area and construction land was 0.03%,-0.26%,0.43% and 3.01% respectively.From 2010 to 2015,the single dynamic attitude of water area and unused land was 0,the single dynamic attitude of cultivated land,forest land,grassland and construction land was-0.13%,-0.0.03%,0.11% and 12.52%,respectively.Among them,the construction land and grassland showed an increasing trend,while the cultivated land and forest land showed a decreasing trend,and the construction land changed the most dramatically.On the whole,during the research period,the single dynamic attitude of construction land was the largest,followed by grassland,and the smallest was cultivated land.The main reason is that with the increase of population in Jinsha county and the development of social economy,the demand for housing and infrastructure is constantly increasing.Therefore,the increase of construction land leads to the most drastic change.(4)Through the analysis of driving force of land use/cover change,it is found that the main driving force of land use/cover change in Jinsha county is the population and economic development.The analysis results show that the 11 driving factors selected in this study are as follows:X1(population),X2(GDP),X3(the total of investment in fixed assets),X4(corn),X5(rapeseed),X6(tobacco),X7(vegetables),X8(coal),X9(liquor),X10(ordinary secondary school teachers),X11(health agency personnel)of Jinsha land use/cover change has certain influence.The comprehensive analysis shows that the total population and annual gross domestic product,total investment in fixed assets,liquor yield,raw coal production,flue-cured tobacco production is the main driving factors of cultivated la--nd,grassland and construction in Jinsha.The implementation of theproje--ct of returning farmland to forests is the main driving factoers of the forset land.It can be seen that socio-economic development is the main driving force affecting land use/cover change in Jinsha county.This research selected the Jinsha county as study area,through the analysis of land use/cover change in Jinsha from 1990 to 2015,to carry out the,we have a clear understanding of its land use/cover change in time and space and the main driving force of land use/cover change in Jinsha county.By analyzing the land use/cover change and its driving factors in Jinsha county,this study can provide a supplement on studies on land use/cover change,and provide reference for other county land use and management methods.In the future land use and management of Jinsha county,the development and utilization of unused land can be appropriately increased on the premise of not destroying the ecological environment.We should attach importance to the implementation of the project of returning farmland to forest,and at the same time pay attention to the protection of basic farmland and water environment,so as to promote the land use and social economy of Jinsha county to develop towards the direction of green environmental protection and sustainable development.According to the actual situation of each county,the development of characteristic industries in each county and the national poverty alleviation policy will promote the development of social economy in the county,so as to promote the land use and management in the county to be more reasonable and feasible.Through comparison with the study of land use/cover change in other counties,it is found that Jinsha county,as an economically strong county with backward economic development,has unique land use/cover change:(1)From the perspective of land use type structure,compared with other counties in non-economically backward areas,Jinsha county's land use type is mainly arable land and forest land,and construction land which occupied a relatively small proportion compared with other counties.(2)From the perspective of dynamic attitude change,compared with other economically strong counties in non-economically backward areas,in the single dynamic attitude of land use type in Jinsha county,the dynamic attitude of construction land is smaller than that of other counties,and the comprehensive dynamic attitude of land use/cover change is also smaller than that of other counties.However,compared with non-economically strong counties,in the single dynamic attitude of land use type,the dynamic attitude of construction land is greater than that of other counties,and the comprehensive dynamic attitude of land use/cover change is also greater than that of other counties.(3)From the perspective of land use/cover transfer,Jinsha county,as an economically strong county in a region with backward economic development,has a certain social and economic foundation,and has achieved certain economic development under the guidance of policies.All types of land use/cover have shifted to some extent,but the direction,quantity and spatial distribution are different from other counties.The extent of change of unused land transfer is small,and the utilization degree of unused land development is lower than that of other counties. |
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