以1km×1km栅格为基本单元，选取交通路网指数、水域指数、学校指数、居住影响力指数与地被指数等影响因子，运用GIS技术建立大滁城人居环境指数模型，定量研究大滁城规划区人居环境的适宜程度及其空间规律性。结果表明：大滁城人居环境指数呈现由中心区域向周边地区递减的趋势；人居环境指数与人口密度有较好的相关性，二者的一次拟合度R2=0．8361。一般适宜以上的地区132km2，接近大滁城面积的2．96％，相应的人口占大滁城8．75％，其中3．3％的人口聚集在0．78％人居环境高度适宜和比较适宜地区；临界适宜地区698km2，占大滁城面积的15．69％，人口39．33万；适宜性相对较差的地区3619km2，人口108．91万，占大滁城总面积的81．35％。%We analyze the abrupt changes of oxygen, carbon isotope values and Sr contents in stalagmite S J3 retrieved from Song:jia Cave, Central China. Some conclusions are given below : ( 1 ) Oxygen isotope values record the transition from Last Glacial Maximum to Heinrich Event One period;(2) Carbon isotope values record the transition from H1 cold period to BoilingAllerod warm period ; ( 3 ) The correlation between Carbon isotope values and Sr contents indicate that the local East Asian summer monsoon were in - phase with the winter monsoon during 19.8 - 15.3ka while out of phase during 15.3 - 14.8ka. It' s obvious that stalagmite S J3 records the palaeoclimate changes between colddry and warm wet conditions while different climate proxies were dissimilar in sensitivities with regard to climate changes.
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