基于1992、2002、2008年三个时相TM数字遥感影像和1:10万地形图数据,通过目视解译方法提取冰川面积,研究了青藏高原腹地长江源头各拉丹东地区冰川变化问题。结果表明:各拉丹东地区总冰川面积自1992年以来呈持续下降趋势,面积由1992年的931.59km2减少至2002年的927.66km2,至2008年时缩减至915.13km2。1992~2008年冰川面积共减少了16.46km2,年平均递减约1.03km2,总面积减少约1.77%。2002-2008年总面积下降约1.35%,约为1969-2000年的31a间冰川消融面积的80%,表明近二十年青藏高原腹地冰川退缩速率明显加快。进一步分析发现,面积较小的冰川其消融或退缩速度更快,面积较大的则相对较为缓慢。在总体退缩趋势下,2号冰川末端部分地区2002年出现了增长趋势,其变化趋势表现为:退缩-短暂前进-退缩。对影响冰川变化气候因子分析表明,近几十年青藏高原地区升温所引起的气候变暖是影响20世纪90年代中期以来该地区冰川加速消融的根本原因,气候显著变暖冰川明显退缩。 Based on the three temporal TM digital remote sensing images of 1992, 2002 and 2008, and 1: 100000 topographic map data, the glacier area was extracted by visual interpretation method, and the glacial changes in the Laddan region at the source of the Yangtze River in the hinterland of the Qinghai-Tibet Plateau were studied. The results show that the total area of ​​glaciers in each of the Laddan East regions has been on a downward trend since 1992, decreasing from 931.59km2 in 1992 to 927.66km2 in 2002 and to 915.13km2 in 2008 and from 1.992 to 2008 A decrease of 16.46km2, an average annual decrease of about 1.03km2, a decrease of about 1.77% in total area. The total area in 2002-2008 dropped by about 1.35%, about 80% of the 31a glacier ablation area in 1969-2000, indicating that the rate of glacier retreat in the hinterland of the Qinghai-Tibet Plateau has accelerated significantly in recent 20 years. Further analysis found that the smaller glaciers abate or retreat faster, larger area is relatively slow. In the overall retreat trend, part of the end of Glacier No. 2 showed an increasing trend in 2002, the trend of which showed as follows: retreat - brief advance - retreat. Analysis of climatic factors affecting glacier change shows that the warming caused by warming in the Tibetan Plateau in recent decades is the fundamental reason that accelerates glacial acceleration and ablation in this area since the mid-1990s. Glaciers with obviously warming climate recede obviously.