皖南区域土地利用长时间序列时空变化分析

Analysis of Land-use Long Time Series Spatio-temporal Changes in the Southern Anhui

采用1980—2020年共8期土地利用数据,结合土地利用动态度指数,揭示了皖南区域近40年的土地利用时空演变特征与变化趋势。结果表明,1980—2020年皖南区域土地利用结构基本稳定;林地、耕地面积总体呈减少趋势;建设用地、草地、水域和未利用地面积总体呈增加趋势,这是区域自然环境与社会经济发展共同作用的结果。随着时间的推移,各种土地利用类型发生着不同程度的变化,耕地、林地、草地和水域的变化速度较缓慢,而建设用地和未利用地的变化速度较快。青弋江流域土地利用类型变化速度最快,秋浦河与新安江次之,阊江最慢。皖南区域在安徽省具有重要的生态战略地位,发展过程中应合理规划土地,实现土地动态平衡。

Using eight periods of land-use data from 1980 to 2020 and dynamic indices,we revealed the spatio-temporal change characteristics and trends of the southern Anhui in the past 40 years.The results showed that the land-use structures of the southern Anhui were steady from 1980 to 2020.The area of forest and cultivated land generally showed decreasing trends,and the area of construction land,grassland,water and unused land mostly presented an increasing trend,which was the result of joint action of regional natural environment and socio-economic development.Each type of land-use changes in different degrees over time.Among them,the change rates of cultivated land,forest,grassland and water were relatively slow.Still,the change rates of construction land and unused land were faster.The Qingyi River has the fastest change rate,followed by the Qiupu River,Xin’an River and Chang River.It is necessary to plan land rationally and realize the land dynamic balance in the process of development because of the important ecological strategic position of the southern Anhui.