). In addition, widespread advances were observed in upturn date (UD) and stabilization date (SD), primarily in the transitional zones between forest and grassland sub-regions, along with significant delays in the RD across the west-central region of basin. Furthermore, 70% of the YRB exhibited an advancing trend in the DD of PPI, which contrasted distinctly with the trends observed for kNDVI and EVI. These findings suggest improved performance of PPI in detecting autumn senescence and provide valuable insights into the potential of various VIs for LSP retrievals.
Yu et al. (Fri,) studied this question.