巢湖沉积物磷铁硫形态记录及其环境变化指示

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Abstract Fractions of phosphorus, iron and sulfur in the surface sediments and two sediment profiles from Chaohu lake were analyzed to study their implication for the spatio-temporal environmental changes. Sedimentary records of total phosphorus (TP) in S3 sediment profile indicated an increasing pollution inputs from anthropogenic activities in the western lake since 1960s. The increase of watershed terrestrial runoff inputs indicated by calcium-bound phosphorus (Ca-P) was earlier than the domestic sewage inputs indicated by iron/aluminum-bound phosphorus (Fe/Al-P) in sediments. The synchronous increasing of organic matter and pH in the layer of 15~0cm in S3 sediment indicated an increasing lake primary productivity as well as the intensity of photosynthesis. Fractions of phosphorus in S7 profile, however, indicated different environmental changes in eastern lake. Fe(II) was the main fraction of total active iron in Chaohu lake sediments; the ratios of Fe(III)/Fe(II) in S3 and S7 profiles show an synchronous trend with Fe(III), indicating that the change of Fe(III)/Fe(II) was driven by Fe(III). Ratios of Fe(III)/Fe(II) indicated a weak oxidation condition for the upper sediment layer and reduction for the down layer in both of the S3 and S7 profiles. Acid volatile sulfur (AVS) was the main form of the reduced inorganic sulfur (RIS) in Chaohu lake sediments. High organic matter, low elemental sulfur and strong reducing condition in Chaohu lake sediments restricted the transformations of AVS to pyrite sulfur (CRS). The P- and S-bound iron proportioned only a very small part for the total iron in the sediments of Chaohu lake. The high ratios of Fe/P and Fe/S in the sediments of Chaohu lake weakened the release of internal phosphorus, and thus the correlation of P, Fe and S was insignificant on the whole.

Key words： phosphorus fractions active iron reduced inorganic sulfur sediment eutrophication

Received: 18 November 2020

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X524

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	CHEN Xi
	NING Cheng-wu
	WANG Jie
	HUANG Tao
	SUN Qing-ye

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CHEN Xi,NING Cheng-wu,WANG Jie等. Fractions of phosphorus, iron and sulfur in lake sediments of Chaohu and its implication for environmental changes[J]. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(6): 2853-2861.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2021/V41/I6/2853

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