Abstract: The native and invasive species in
the Yellow River Delta were examined for their spatiotemporal
characteristics and succession pattern. First, the appropriate
Sentinel-2 and Landsat-8 images from 2018 were selected according to
phenological characteristics. A random forest algorithm was used to
verify the image spectral band
significance
and separability using selected images to determine the native and
invasive species. Then, the spatiotemporal variation of habitat
structure of native and invasive species is discussed in depth from the
perspective of landscape ecology. Finally, the expansion direction and
expansion mode of S. alterniflora were further analyzed, and main
results were obtained as follows. (1) At the medium-high resolution
multi-spectral image level, the accuracy of different vegetation
community extractions can be improved by taking into consideration both
the vegetation phenology and the spectral features of remote sensing
images. (2) Sentinel-2 images with red edge bands have obvious
advantages in vegetation community extraction as compared to Landsat-8
images (Sentinel-2, OA=82.86%, Kappa coefficient=0.79; Landsat-8,
OA=78.77%, Kappa coefficient=0.74). (3) The expansion pattern of theS. alterniflora community became spatially continuous, more
regularized and aggregated overtime. (4) The expansion in the north
shore mainly faces to the sea, and the south bank mainly faces to the
land, and this phenomena is closely related to the sedimentation of the
Yellow River Delta. Marginal and external expansion both occurred, but
marginal expansion predominated. The results from this study have
important theoretical and scientific value for the environmental
protection and sustainable development of the entire Yellow River
Delta.