基于地理探测器的四川地区冰川面积变化影响因素探究

Research on Influencing Factors of Glacier Area Change in Sichuan Based on Geographic Detectors

结合GIS和RS技术,应用地理探测器方法分析四川区域2007—2017年冰川面积变化空间分异特征及其影响因素,选取坡度、坡向、海拔等7个影响因子,通过权重叠加作出该区域冰川脆弱性示意图。结果表明:(1)10年间东南向冰川占比减少,北向冰川占比增加;东向冰川减退面积较大,西向冰川面积整体持平。(2)期间,影响四川地区冰川面积变化区域空间差异的主要因素是冰川规模,小型冰川(面积小于或等于1 km^(2))的面积变化主要受夏季温度和降水变化影响;而中型冰川(面积大于1 km^(2))不仅受夏季温度和降水变化影响,还受地形因子的影响。(3)四川冰川脆弱性示意图显示区域内冰川均呈不同程度的脆弱性,总体上为轻-强度脆弱。

Geographic detector method is adopted in combination with GIS and RS technology to quantitatively analyze the spatial differentiation characteristics of glacier area change in Sichuan from 2007 to 2017 and its influencing factors.Seven influencing factors such as slope,aspect,elevation,and so on are selected to draw the schematic diagram of glacier vulnerability in the region through weighted overlap analysis.The results show that:①In the past ten years:the proportion of glaciers in the southeast direction has decreased,and the proportion of glaciers in the north direction has increased.The melting area of glaciers in the east direction has become larger,and the melting area of glaciers in the west direction has remained the same.②On a ten-year scale,the most important factor affecting the spatial difference of glacier area change in Sichuan is the size of the mother glacier.The spatial differentiation of small glaciers is not greatly affected by topographic factors,and is mainly affected by summer temperature and precipitation changes.While medium glaciers are not only affected by changes of temperature and precipitation in summer,but also by topographical factors.③The schematic diagram of the vulnerability of Sichuan glaciers shows that the glaciers in the region are of varying degrees of vulnerability,generally at light-heavy level.