太湖沉积物铁形态分布特征及磷铁相关性分析

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Abstract

Occureneces and distributions of iron forms in the sediment cores from three typically zones of Lake Taihu, i.e. phytoplankton dominated zone, macrophyte dominated zone, and phytoplankton-macrophyte transition zone, were investigated using the sequential extraction procedure. Generally, the total iron contents decreased in the order:phytoplankton dominated zone(31.57±8.51mg/g) >phytoplankton-macrophyte transition zone(30.34±11.97mg/g) >macrophyte dominated zone(25.25±4.59mg/g), while the contents of different iron forms in the interest sites followed the variations:reducible oxides Fe_ox2 >carbonate associated Fe Fe_carb >easilyreducible oxidesFe_ox1 >poorly reactive sheet silicate FeFe_prs >magnetite Fe_mag >Absorbed Fe(Ⅱ), Fe_carb、Fe_ox1、Fe_ox2 weremeasured to be7.79mg/g, 6.16mg/g, 8.18mg/g, accounting for 28.56%, 21.54%, 29.53% of total iron respectively, suggesting those highly reactive iron Fe(Ⅲ) were the dominated iron forms. The concents of different extracted phosphorus in sediment decreased in the order:NH₂OH·HCl-P >MgCl₂-P >NaAc-P >Na₂S₂O₄-P >Concentrated HCl-P >(NH₄)₂C₂O₄-P. Three dominated phosphorus fractions including MgCl₂-P、NaAc-P、NH₂OH·HCl-Pwere measured to be 0.067mg/g, 0.061mg/g, 0.068mg/g, accounting for 35.28%、31.97% and 22.55% of the total extracted phosphorus.Significantly positive relationships were observed between the extracted phosphorus and iron fractions using the sequential extraction(P<0.05), further confirming the concomitant release of phosphorus from reduction dissolution ofFe(oxyhydr) oxides in sediments.

Key words： sequential extraction for iron phytoplankton dominated zone macrophyte dominated zone phytoplankton-macrophyte transition zone correlativity Taihu Lake

Received: 10 September 2015

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X171

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	Articles by authors
	YANG Wen-bin
	TANG Hao
	HAN Chao
	DING Shi-ming

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YANG Wen-bin,TANG Hao,HAN Chao等. Distribution of iron forms and their correlations analysis with phosphorus forms in the sedimentary profiles of Taihu Lake.[J]. CHINA ENVIRONMENTAL SCIENCECE, 2016, 36(4): 1145-1156.

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http://manu36.magtech.com.cn/Jweb_zghjkx/EN/ OR http://manu36.magtech.com.cn/Jweb_zghjkx/EN/Y2016/V36/I4/1145

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