Table 5 Proportion of habitat quality grades in the TRSR from 1990 to 2020.
From: Spatiotemporal evolution of land use and habitat quality in the Three-River source region
Habitat quality class | 1990 | 2000 | 2010 | 2020 | ||||
|---|---|---|---|---|---|---|---|---|
Area/km2 | Ratio/% | Area/km2 | Ratio/% | Area/km2 | Ratio/% | Area/km2 | Ratio/% | |
Minimal | 85,349.13 | 22.32 | 85,523.90 | 22.36 | 69,091.21 | 18.07 | 68,574.59 | 17.93 |
Reduced | 3236.24 | 0.85 | 3322.39 | 0.87 | 3769.44 | 0.99 | 3754.36 | 0.98 |
Moderate | 257,568.56 | 67.35 | 257,385.63 | 67.31 | 272,390.93 | 71.23 | 271,980.10 | 71.13 |
Elevated | 20,665.86 | 5.40 | 20,493.81 | 5.36 | 20,675.82 | 5.41 | 20,648.53 | 5.40 |
Maximal | 15,588.46 | 4.08 | 15,682.52 | 4.10 | 16,481.31 | 4.31 | 17,418.60 | 4.56 |
