Table 1 Summary of independent variables used in the analysis of SIA and LSD, with abbreviation and unit
Category | Variable | Abbreviation | Units |
|---|---|---|---|
Land use | Dry farmland proportion | DFLP | % |
Paddy farmland proportion | PFLP | % | |
Landscape pattern | Area metrics | Â | Â |
Class area | CA | ha | |
Edge metrics | Â | Â | |
Total edge | TE | m | |
Edge density | ED | m/ha | |
Mean patch edge | MPE | m/# | |
Patch density, patch size and variability metrics | Â | Â | |
Number of patches | NumP | # | |
Mean patch size | MPS | ha | |
Median patch size | MedPS | ha | |
Patch size standard deviation | PSSD | ha | |
Patch size coefficient of variation | PSCoV | % | |
Shape metrics | Â | Â | |
Mean shape index | MSI | Â | |
Mean perimeter-area ratio | MPAR | Â | |
Mean patch fractal dimension | MPFD | Â | |
Area-weighted mean patch fractal dimension | AWMPFD | Â | |
Area-weighted mean shape index | AWMSI | Â | |
Remote sensing environmental indicators | Normalized difference vegetation index | NDVI | Â |
Wetness index | WI | Â | |
Distance | Shortest distance from the Yangtze river | SDYR | km |
Snail control measure | Whether mollusciciding had taken place | MOL (Y/N) | Â |