太湖沉积物孔隙水无机氮空间变化特征

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Abstract

Sediment cores were collected in different areas with different ecological states in Lake Taihu to observe vertical variation in physicochemical characteristics of sediments and porewater inorganic nitrogen.The three areas were Xukou Bay dominated by macrophytes,Central Lake with strong wave and less algal bloom,Meiliang Bay with severe algal bloom.The results showed that water content,organic matter,and TN decreased with increasing sediment depth in the three sampling sites,with the highest values observed in Meiliang Bay while the lowest values in Central Lake.Meanwhile,dissolved oxygen within sediments decreased with increasing sediment depth,and the highest concentration was found in Xukou Bay and the lowest in Meiliang Bay.Porewater ammonium concentration increased dramatically downward in the sediments,in contrast to nitrate and nitrite concentrations.A comparison of inorganic nitrogen concentration from within top 5-cm sedimentary porewater and the overlying water suggested that release risk of nitrate and nitrite was low in all three areas;both Xukou Bay and Meiliang Bay had a relatively high risk for ammonium release into overlying water,while the risk was low in Central Lake.

Key words： Dissolved oxygen porewater inorganic nitrogen Ecological type of lake Lake Taihu

Received: 25 June 2011

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	WANG Feng-Wen
	ZHONG Ping
	LIU Zheng-Wen

Cite this article:

WANG Feng-Wen,ZHONG Ping,LIU Zheng-Wen. Spatial variation of porewater inorganic nitrogen in Lake Taihu, China[J]. , 2011, 30(3): 340-345.

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http://www.ecolsci.com/EN/ OR http://www.ecolsci.com/EN/Y2011/V30/I3/340

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