论文部分内容阅读
本文根据西太湖3．96m长湖泊岩芯沉积物的地球化学、微体占生物的综合分析．讨论了太湖距今14000多年来的演化过程，结果表明：14300－13000aBP气候干旱，西太湖尚未形成；13000－11030aBP降水增加，湖泊形成．但气候偏凉；11030－10200aBP是一个较显著的冷偏湿期．湖泊水位相对较深；10200-9500aBP为一温干时期；9500－7200aBP是偏暖湿的过渡阶段．内部波动剧烈；7200－5700aBP为一暖湿期；5700－4900aBP各项指标发生突变，地层存在沉积间断；4900aBP至今，湖泊水深减小，湖底沉积物受波浪扰动，藻类生长茂盛，富营养化程度逐渐严重．
Based on a comprehensive analysis of the geochemical and microbial accounting for core sediments of 3.96m long lake in the West Lake, The evolution of the Taihu Lake from 14000 years ago is discussed. The results show that the climate of 14300-13000 aBP is arid, but the West Taihu Lake has not been formed yet; the precipitation is increased from 13000 to 11030 a BP and the lake is formed. But the climate is cool; 11030-10200aBP is a more significant cold-wet period. Lake water level is relatively deep; 10200-9500aBP is a warm period; 9500-7200aBP is warm and wet transitional stage. The internal fluctuation was intense; 7200-5700 aBP was a warm-wet period; 5700-4900 aBP was abrupt in every index and sedimentary discontinuity existed; 4900 aBP so far, the lake water depth decreased, the lake bottom sediment was disturbed by waves, the algae grew flourishingly, the degree of eutrophication Gradually serious.