| Land use change can reflect the regional ecological environment and is an important indicator to judge whether the regional land use is reasonable.Under the combined effect of natural factors and human activities,the spatial structure of land use has undergone obvious changes in Yuanyang.The quantitative analysis of the spatial-temporal evolution process and characteristics of land use in the region and its driving force impact mechanism have contributed to the optimization of regional Space,enhance the overall function of the region,coordinate with the resource and environmental carrying capacity,and realize the sustainable use of land and the intensive development of cities and towns.This paper takes Yuanyang,a plain beach in Henan Province as a research area,to explore the spatial and temporal evolution process and characteristics of land use changes in the research area: to establish land at different research time points(1990,2000,2010,and 2018)A database of quantity and distribution characteristics of use;calculation of the speed and extent of land use change in different time periods(1990-2000,2000-2010 and 2010-2018)within the study area,including single land use of various types The dynamic degree and the comprehensive land use dynamics in the region are comprehensive index of the degree of land use;calculating the circulation between various categories in each research period,both the land use type transfer matrix;and further exploring on the basis of analyzing the land use evolution The driving force influence mechanism of land change: The qualitative and quantitative analysis is carried out using the natural and social economic data of Yuanyang,and the driving factors are divided into three aspects: natural factors,human factors and policy factors.Qualitative analysis of landforms,soil and hydrology and other factors for natural factors,analysis of policies and urban development strategies that affect land changes from the macro national level to the micro level in different research periods,and a qualitative and quantitative analysis method for human factors,Researched separately from the aspects of social economy,demographic factors and technological progress,and then selected 10 factors for comprehensiveanalysis using principal component analysis and multiple linear regression methods.The regression equation is used to quantify the impact of various factors on the land use change in Yuanyang.Finally,on the basis of the analysis results of this influence mechanism,it provides targeted policy recommendations for the sustainable and intensive development of land use in Yuanyang.The following research conclusions are drawn:(1)From the perspective of quantity structure,Yuanyang takes cultivated land and construction land as the dominant land category.Each category has a different increase or decrease in the research period.Cultivated land is the land area with the largest decrease in area,and construction land is The largest increase in land types.Forest land,grassland and other ecological service-oriented land have always had a low proportion.In the long run,there are ecological security risks.Unused land is used to balance the demand for cultivated land and other land.The number is very small and the area is constantly decreasing.The reserve land resources are seriously lacking.(2)There is a big difference in the dynamic degree of single land use of various types of land at various research stages.The rate of change in construction is the most active,and the rate of change in cultivated land is relatively stable,ensuring the overall stability of the land system in Yuanyang.The evolution of integrated land use dynamics during the study period has been on a downward trend,and the degree of disturbances affecting human land use has been steadily decreasing.The overall land system in Yuanyang has been relatively stable.(3)The comprehensive land use index of Yuanyang exceeded 300 during the study period,and the overall index was at an upper level,indicating that the area has always had a high degree of land use.In the early stage,the land use degree of Yuanyang changed greatly.At this time,the overall urbanization level was low,land use was in a rapid development stage,and the rate of land use degree change in the middle and late stages decreased.It shows that the overall land use structure of Yuanyang is gradually stable,but the land use degree is relatively high at this stage,and maintaining the land use sustainability of Yuanyang will be the focus of land system management in the future.(4)The spatial development and evolution of Yuanyang during the study period is very obvious,mainly manifested by the expansion and agglomeration of construction land and the change in the flow of cultivated land,with obvious phases.During the period from 1990 to 2000,the mainland use spatial changes were concentrated on the cultivated land around Yuanyang turned into construction land,and the trend of non-agriculturalization was obvious.2000-2010 was a period of great changes in the land use space of Yuanyang.In this stage,cultivated land was the main source of land for township expansion in Yuanyang.Land change near townships was relatively high.In Yuanyang Town and Qiaobei Township(The present plain demonstration area)has a certain agglomeration distribution,other construction land in the beach area has significantly increased,and urban development has a direct impact on ecological security.During the period from 2010 to 2018,the conversion of various types of land was gradually gradual,but the spatial agglomeration characteristics were further strengthened.The construction land near Yuanyang and the plain demonstration area in the urban area increased significantly,and the construction land in the beach area was restored to cultivated land.During the study period,the overall land use change in Yuanyang gradually developed towards spatial intensification and sustainability.(5)The land use change in Yuanyang has a direct impact on natural factors at a long time scale.Land use change takes priority in areas with good natural conditions,and gradually changes in areas with poor natural conditions as land resources are consumed.Natural factors affected the distribution of rural settlements and the location of cities and towns through agricultural production in the early stages of social development,which directly caused the differences in the distribution of land types in different regions of Yuanyang.The urban development strategy and policy factors play a decisive role in the changes of land use in Yuanyang,which determines its spatial structure and direction of land use development.The results of quantitative analysis can be concluded that economy,population and science and technology are very important drivers of land use change in Yuanyang.Specifically: the change of cultivated land is mainly affected by the negative effect of local budget expenditure and urban population and the positive effect of the total power of agricultural machinery.The changes in construction land are mainly summarized as the positive effects of gross national product,local budget expenditure,secondary industry output and total population. |
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