Space Time Comparative Analysis of Surface Sediment Organic Matter,TN and TP in Nansi Lake

Depending on the monitoring data in water quality and sediment quality spiritual distribution of Nansi Lake,which has been monitored four times in 2006,2007,2010 and 2011,we have used the summary statistics and comparing methods to analyze the characteristics on spatiotemporal variations of surface sediment organic matter,TN and TP in Nansi Lake.Results showed the content of sediment organic matter,TN and TP in Nansi Lake remained high level,the average content of sediment organic matter was 4.12%,TN was 0.27%,and TP was 0.088%.Compared with 2006-2007,the content of the sediment organic matter and TN in 2010-2011 during drought period in Nansi Lake was declined,but the sediment TP was increased.The average content of the sediment organic matter,TN and TP of Nansi Lake has showed a declining trend from the north to the south,however,in Zhaoyang Lake(lower),the content of the sediment organic matter and TN occurred minimum,then showed a decrease after increase,the decreasing range of sediment TP was small.The average content of the sediment organic matter,TN and TP of Laoyun River and Guangfu River was far higher than other river estuaries and lakes.In 2011,we have monitored the average content of the sediment organic matter,TN and TP of the join rivers of Nansi Lake and the lake regions,the ratio of these two were 0.63,0.50 and 0.96,the appropriate sediment content of the lake region were higher than that of the content in join river of Nansi Lake,this showed the enrichment which the organic matter,TN and TP were more prominent on the sediment in Nansi Lake.