The Vertical Distributions of Nitrogen and Phosphorus in the Sediment and Interstitial Water in Taihu Lake and Their Interrelations
FAN Chengxin YANG Longyuan ZHANG Lu (Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, P.R.China)
The contents of nitrogen and phosphorus and ferrous in the column sediments and their interstitial water were analyzed and compared in the main regions of Taihu Lake in 1998. The results show that the upper layer(0—10cm) contained higher contents in TN and TP and than the lower. And NH 4 N and PO 4 P in the interstitial water are a bit higher in the seriously polluted waters than those in the gently polluted waters. However, those of the lower layers are slightly higher in the gently polluted waters than those in the seriously polluted. It was indicated that there was no distinct corresponding relationships between NH 4 N/PO 4 P contents in the interstitial water and TN/TP contents in the sediments. The ferrous concentration in the interstitial water is distinctly in positive correlation with NH 4 N content ( R =0.9234).