Period Area/km2 Area change rate/%
Addition Loss Retention Change Increasing rate Attrition rate Retention rate Total
LIG 111055 28374.16 647234 82680.79 16.44 4.20 95.81 108.05
LGM 98509.7 42620.18 632988 55889.52 14.58 6.31 93.70 101.97
MID 119693.5 29653.95 645954.2 90039.55 17.72 4.39 95.62 108.95
50s-126 32884.35 121586.2 553949 -88701.9 4.87 18.00 82.00 68.87
50s-245 77403.53 138390.2 537160.6 -60986.6 11.46 20.49 79.51 70.49
50s-370 61542.51 159033.9 516485.6 -97491.4 9.11 23.54 76.45 62.02
50s-585 47145.94 203047.5 472503.4 -155902 6.98 30.06 69.94 46.87
70s-126 48964.43 88028.21 587522.6 -39063.8 7.25 13.03 86.97 81.19
70s-245 99629.48 145428.4 530038.2 -45798.9 14.75 21.53 78.46 71.68
70s-370 78531.53 243828.3 431704.5 -165297 11.62 36.09 63.90 39.44
70s-585 113049.2 196851.1 478699.7 -83801.9 16.73 29.14 70.86 58.46