Analysis Of Land Use Change And Driving Force In Songnen Plain During The Past 30 Years

Land is the material basis of people’s daily life and an important source of survival.It is also the most basic and valuable resource in agricultural production and social production.Land use is the long-term or regular management or improvement of land according to the natural characteristics of land and the needs of people’s own or social development.For more than 30 years,with the rapid economic development of Songnen Plain,In order to correctly deal with the conflict between the shortage of land resources and economic development in Songnen Plain,adjust the land use structure and promote the sustainable economic development in Songnen Plain,this paper makes an in-depth study on the land use change in Songnen Plain.During the land use research and investigation,remote sensing technology has become a recognized means of land use change research because of its objective,accurate and wide range.Based on the full collection of the existing basic geological,ecological environment and other relevant data in Songnen area,taking Landsat Image data as the information source,this paper obtained three phases of remote sensing images in 1986,2000 and 2018,using the visual interpretation method of human-computer interaction,This paper extracts the land use type data of Songnen Plain,analyzes the land use dynamic degree,land type conversion and land use degree of Songnen Plain by using mathematical methods,superimposes and analyzes the spatial change of land use in Songnen Plain Based on GIS platform,and finally combines the data of nature,economy and population in Songnen plain during the research period,The influence degree of each driving factor on land use change in Songnen area is analyzed qualitatively.The principal component regression analysis method and grey correlation analysis method are introduced to quantitatively analyze the selected driving factors from the overall and local perspectives.The research results are as follows:1.The land use in Songnen Plain is mainly cultivated land,grassland and forest land,and the area of the three land types accounts for more than 80% of the whole study area.During the study period,the cultivated land area increased greatly.By2018,the cultivated land was the main land use type in Songnen Plain,and the total area reached more than 70% of the total area of the study area.2.The mutual transformation of land types in Songnen Plain is more frequent,and the transformation of land types in the study area is mainly from grassland to cultivated land.The land use degree of the study area is at the upper middle level,and the land use degree of each administrative region is different.During the study period,the land use degree of each administrative region has increased,and the gap between each administrative region has been narrowing.3.The spatial-temporal changes of various types in Songnen Plain are relatively significant.Among them,the most significant changes are located in the Midwest and southwest of Songnen Plain and both sides of Songhua River and Nenjiang River.The change types are mainly the increase of cultivated land area and the decrease of grassland,forest land and water area.4.Through the qualitative and quantitative analysis of Songnen Plain,the results show that the natural and social factors in Songnen plain have a certain impact on land use change,and the factors affecting the change of various land types are different in each period of time.