THE IMPACT OF THE SPARTINA ALTERNIFLORA CONTROL ON THE LANDSCAPE PATTERN IN YANCHENG COASTAL WETLAND OF CHINA

The paper selected a typical area of Yancheng coastal wetland as a case, and utilized remote sensing images from 1983, 1997, 2000, 2021, and 2023 as data sources.The landscape ecology, GIS technology, and R-Vector Coefficient methods were used to analyze the impact of Spartina alterniflora control on landscape patterns.The results were as follows: The development of Spartina alterniflora communities in the study area underwent a progression of "scattered points patches belts elimination", with developmental trend transitioning from "point blasting" to "spread diffusion" and finally "collapse".The area of Spartina alterniflora had been reduced from a peak of 4 124.361hm to 162 hm after the control.The centroid of the standard deviational ellipse of Spartina alterniflora communities had shifted from the south to the northeast in the region, with the lengths of major and minor axes decreasing from 6 771.415 m and 727.669 m during peak expansion to 1350.543 m and 208.396 m post-control.The orientation angle had abruptly changed from approximately 160 to 124.252.Before and after the treatment, Spartina alterniflora and mudflats had the greatest impact on regional landscape pattern and landscape diversity.The Pearson Correlation Coefficient between Spartina alterniflora and regional landscape patterns decreased from 0.955 pre-control to 0.562 post-control, while its correlation with landscape diversity increased from 0.280 to 0.452.The Pearson Correlation Coefficient for mudflats with regional landscape patterns declined from 0.345 to 0.122, and its correlation with landscape diversity dropped from 0.292 to 0.050.Finally, scientific recommendations for Spartina alterniflora control were proposed.These results could provide actionable references for regional ecological restoration and highquality sustainable development.