关键词: 衡水湖湿地, 景观指数, 时空变化, 移动窗口法, 驱动因子

Abstract: Landscape index is a constant quantitative index to study the evolution of landscape pattern, and exploring the change of landscape pattern is of great practical significance to maintain the sustainable development of nature reserves. By using the moving window method in ArcGIS and Fragstats software, this paper spatialized the selected landscape index, analyzed it from the two aspects of time and space, and studied the spatial-temporal evolution characteristics and change rules of Hengshui Lake wetland landscape index. The results showed that before the Yellow River diversion, the area of farmland and unused land changed sharply, resulting in a high degree of fragmentation. The low-value area of landscape index was distributed all around the lake area and transferred to the lake area. With the beginning of yellow diversion, especially after 1999, the aggregation degree of all types of patches was strengthened, the edge shape became regular, and the degree of fragmentation was reduced. In recent years, due to the increase of residential areas and unused land area, the degree of human interference has increased, resulting in the increase of landscape diversity and the gradual transfer of low-value landscape index areas to construction land in the peripheral protection belt. It is of great guiding significance for wetland landscape evolution and land resource utilization to analyze the changes of landscape types in Hengshui Lake and explore the characteristics of patch evolution under different driving factors.

Key words: Hengshui Lake wetland, landscape index, spatial and temporal variation, moving window method, driving factors