巢湖西半湖富营养化时空变化趋势与成因分析

收集整理了巢湖西半湖6个国控监测点1983~2008年（26年）主要富营养化指标TP、TN、CODmn、Chla的监测数据,计算了6个监测点和西半湖总体26年的综合营养状态指数（∑TLI图示）时空变化情况。并用Spearm an秩相关系数分析检验了西半湖总体和6个监测点26年∑TLI年变化趋势。结果表明：按总平均∑TLI排列,6个监测点富营养化由重到轻依次为：南淝河入湖区（66.64）〉塘西（64.93）〉十五里河入湖区（63.35）〉派河入湖区（61.38）〉新河入湖区（59.51）〉西半湖湖心（59.18）;在显著水平0.05和0.01各点∑TLI均有上升趋势,其中十五里河入湖区（R=0.715）、新河入湖区（R=0.824）和西半湖湖心（R=0.811）以及西半湖总体（R=0.512）∑TLI有显著上升趋势,而南淝河入湖区（R=0.192）、塘西（R=0.045）和派河入湖区（R=0.325）上升趋势均不显著。最后在上述研究的基础上,对巢湖西半湖富营养化时空变化的成因进行了简要分析。

Analysis on the causes and variation tendency of eutrophication in west Chaohu lake,China

The data of 6 national routine monitoring sites in west Chaohu lake were collected and analyzed.The ∑TLI were calculated and illustrated in diagrams for main eutrophication indices TP,TN,CODMn,Chla for 6 routine sampling sites and west Chaohu from 1983 to 2008.And the Spearman coefficient and tendency test were used to demonstrate the variation tendency of eutrophication in west Chaohu lake in the past 26 years.The findings indicated that the ∑TLI for 6 sites were entrance area of Nanfei riverTangxi areaentrance area of Shiwuli river entrance area of Paihe river entrance area of Xinhe river center area of western lake,and the eutrophication level of entrance area of Shiwuli river,entrance area of Xinhe river,center area of western lake and the whole west Chaohu lake significantly increased（P0.01）while entrance area of Nanfei river,Tangxi area and Entrance area of Paihe river had no significant increase tendency.