Table 2 Evaluation indicators, methods, and grading standards for ecosystem asset quality.
Ecosystem assets items | Assessment indicator | Assessment method | Quality grade | ||||
|---|---|---|---|---|---|---|---|
Excellent (%) | Good (%) | Medium (%) | Poor (%) | Bad (%) | |||
Forest | Relative biomass density | \(\:{EAQ}_{ij}=\frac{{B}_{ij}}{{CCB}_{ij}}\times\:100\text{\%}\) | ≥ 80 | 60–80 | 40–60 | 20–40 | ≤ 20 |
Shrub | |||||||
Grassland | Vegetation coverage | \(\:{EAQ}_{ij}=\frac{{C}_{ij}}{{CCC}_{ij}}\times\:100\text{\%}\) | ≥ 80 | 60–80 | 40–60 | 20–40 | ≤ 20 |
