南四湖表层底泥有机质及氮磷时空比较分析

依据2006、2007、2010和2011年4次南四湖水质与底质空间分布监测数据,采用综合统计与比较方法对南四湖表层底泥有机质及氮磷的时空变化特征进行分析研究。结果表明,南四湖湖区底泥有机质、TN和TP含量的平均值依次为4.12%、0.27%和0.088%,南四湖底泥有机质、TN和TP含量总体处于较高水平。2010-2011年比2006-2007年枯水期南四湖湖区底泥有机质和TN含量有所下降,但底泥TP含量有所升高;南四湖分湖区底泥有机质、TN和TP含量的平均值都呈现由北向南递减趋势,但底泥有机质和TN含量在昭阳湖(下)出现最小值而后回升再递减,底泥TP含量递减幅度较小;老运河和洸府河口底泥有机质、TN和TP含量的平均值远高于其它河口及湖区平均值;2011年监测南四湖入湖河口底泥有机质、TN和TP含量的平均值与湖区底泥相应含量的比值依次为0.63、0.50和0.96,湖区平均高于入湖河口底泥的相应含量,说明南四湖湖内底泥对有机质、TN和TP的富集作用比较突出。

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.