Þ is equal to 0.5, the k value is equal to D value.
The stress factors considered in this study include natural
factors (i.e., natural disaster, landslide and mudslides) and human
factors (i.e., road, urban settlements, and farmland). The spatial
distribution data of different stress factors come from the
topographic map and the land use map in the study area.
We used a product method to calculate the ecological
importance index of the space maintaining biodiversity (EIIb) for
each grid, where the three indexes represent three aspects of
maintaining regional biodiversity. The equation is as follows: