Abstract: The Yellow River Delta is the most complete, extensive, and youngest wetland ecosystem in China's temperate zone. In recent years, with the increasing frequency of environmental changes and human activities, local wetland resources have continued to shrink and degrade. The study proposed using object-level sample migration technology based on vector similarity to achieve wetland thematic classification mapping. Based on the landscape ecological risk model and Sen+Mann-Kendall trend analysis, this study evaluated the local ecological security status and spatiotemporal pattern under the background of natural wetland degradation in the Yellow River Delta. Based on dense observations, it was found that the wetland area in the Yellow River Delta showed four phased rules. Among them, the natural wetland shrank the most drastically from 1999 to 2009, reflecting the inadequacies in wetland management and protection during that period. In terms of space, influenced by factors such as artificial landscape expansion, the centroid of natural wetlands moved towards the sea, their living space has been massively compressed.

Biography: Dr Xin Zhang graduated from the Institute of Geographical Sciences and Natural Resources Research, Chinese Academy of Sciences with a PhD degree in 2004 and completed postdoctoral work at the Institute of Remote Sensing Applications, Chinese Academy of Sciences, in 2006. He is currently a professor in the Institute of Aerospace Information Research, Chinese Academy of Science leading workgroup researching on Remote Sensing technologies on Smart Agriculture ,ocean and digital ecological system. He has published over 30 articles in journals and in conference proceedings.