基于土地覆被变化的安徽省生境质量时空演变特征

基于InVEST模型的生境质量模块,采用1995～2018年安徽省3期的土地覆被数据,分析省域生境质量时空演变特征及其对土地覆被变化的响应。结果表明:安徽省土地覆被变化主要是农田转向建设用地和林草地,以及农田和湿地之间的相互转化;23年间,安徽省生境质量整体呈单边小幅下降趋势;由于作为生境质量威胁源的建设用地急速扩张和蔓延,引发合肥和沿江5市城区及周边生境质量的显著下降;部分保护地及周边开展了有效的退田还湖(湿)和退耕还林(草),局域生境质量有明显改善,但多数生态源地生境质量的区域性变化并不明显;最后,对省域生境质量优化提出了相应的对策建议。

Spatio-temporal Evolution Characteristics of Habitat Quality Based on Land Cover Change in Anhui Province

Abstract：Response of spatio-temporal evolution characteristics of habitat quality to land cover change and landscape pattern change in Anhui Province was studied based on ArcGIS platform and the InVEST model, using the land use data of Anhui Province in 1995, 2005, and 2018.The main conclusions are the following: The main land cover changes in Anhui were that cultivated land was converted to construction land, forest and grassland, and there was mutual conversion between wetland and cultivated land.During the study period, The average index of habitat quality in Anhui Province showed a slight one-sided decline trend.Due to the rapid expansion of construction land which acted as a threat factor, habitat quality declined dramatically in urban and surrounding areas of Hefei and 5 cities along the Yangtze River.The effective project of returning farmland to lake and grain for green were carried out in some protected areas and surrounding areas, there has been a marked improvement in the habitat quality while the change of habitat quality in most ecological source areas was not obvious on a regional scale.The paper also puts forward policy suggestions for the optimization of habitat quality in relative areas.