Table 5.
Statistics of graph unit representing different changing types of cultivated land. (B, C, F, G, W and CO represent bare land, cultivated land, forest, grassland, water and construction land, respectively).
| Period | Type | Count | Area (km2) | R (%) |
|---|---|---|---|---|
| 1990–2000 | G→C | 9,745,035 | 8770.53 | 4.02 |
| F→C | 8,205,467 | 7384.92 | 3.38 | |
| W→C | 1,073,502 | 966.15 | 0.44 | |
| B→C | 521,788 | 469.61 | 0.22 | |
| CO→C | 6194 | 5.58 | 0.003 | |
| C→G | 9,035,549 | 8131.99 | 3.73 | |
| C→CO | 2,914,713 | 2623.24 | 1.2 | |
| C→F | 1,273,164 | 1145.85 | 0.53 | |
| C→W | 419,943 | 377.95 | 0.17 | |
| C→B | 94,637 | 85.17 | 0.04 | |
| 2000–2010 | G→C | 5,702,631 | 5132.37 | 2.40 |
| F→C | 2,129,655 | 1916.69 | 0.90 | |
| W→C | 529,596 | 476.64 | 0.22 | |
| B→C | 161,324 | 145.19 | 0.07 | |
| CO→C | 14,295 | 12.87 | 0.006 | |
| C→G | 10,852,882 | 9767.59 | 4.57 | |
| C→CO | 2,853,532 | 2568.18 | 1.20 | |
| C→F | 2,860,296 | 2574.27 | 1.21 | |
| C→W | 1,221,847 | 1099.66 | 0.52 | |
| C→B | 112,596 | 101.336 | 0.05 | |
| 2010–2020 | G→C | 10,151,681 | 9136.51 | 4.35 |
| F→C | 2,719,249 | 2447.32 | 1.16 | |
| W→C | 368,920 | 332.03 | 0.16 | |
| B→C | 792,673 | 713.41 | 0.34 | |
| CO→C | 28,685 | 25.82 | 0.01 | |
| C→G | 4,895,278 | 4405.75 | 2.10 | |
| C→CO | 2,495,842 | 2246.26 | 1.07 | |
| C→F | 2,226,726 | 2004.053 | 0.95 | |
| C→W | 678,810 | 610.93 | 0.29 | |
| C→B | 72,973 | 65.68 | 0.03 |