益阳市土地利用及景观格局时空变化研究

Study on the spatio-temporal changes of landuse and landscape pattern in Yiyang City

以益阳市为研究对象,采用转移矩阵、景观指数等方法探究其近25年来景观格局的变化特征,并分析其内在的驱动因子。研究结果表明:益阳市土地利用类型始终以耕地和林地为主,且以耕地和林地转化为建设用地和水域为主要变化特征;在类型尺度下,益阳市近25年来耕地、林地的优势度下降,且趋于破碎,建设用地优势度上升,且趋于聚集,水域优势度上升但整体趋于破碎;在景观尺度下,益阳市整体景观格局由聚集走向破碎,即优势景观连通性降低,景观异质性程度、破碎化程度变大,景观斑块的聚集程度降低,导致景观类型呈均匀化和多样化的发展趋势。

Taking Yiyang City as the research object,this study uses transfer matrix,landscape index and other methods to explore the change characteristics of the landscape pattern of Yiyang City in the past 25 years,and analyzes its intrinsic driving factors.The research results show that:the main land use types in Yiyang City are cultivated land and forest land,and the main change characteristics are the transformation of cultivated land and forest land into construction land and water areas;On the type scale,the dominance of cultivated land and forest land in Yiyang City has declined in the past 25 years and has become fragmented,the dominance of construction land has increased and has become concentrated,and the dominance of water areas has increased but has become fragmented overall;On the landscape scale,the overall landscape pattern of Yiyang City shifts from agglomeration to fragmentation,that is,the connectivity of dominant landscapes decreases,the degree of landscape heterogeneity and fragmentation becomes larger,and the degree of aggregation of landscape patches decreases,resulting in a trend of homogenization and diversification of landscape types.