太湖蓝藻水华期可溶有机物的生物降解

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Abstract

Occurrence of cyanobacterial blooms can induce considerable patchiness in the quantity and quality of dissolved organic matter (DOM). The present study investigated the changes of dissolved organic carbon (DOC), chromophoric DOM (CDOM) and fluorescent DOM (FDOM) in an inoculated 32-day laboratory incubation. The biodegradation of individual FDOM components was further studied using parallel factor analysis (PARAFAC) and two dimension correlation spectroscopy (2D-COS). The results showed that the DOC concentration decreased significantly initially, followed by a slow biodegradation. Fitting by G model successfully separated the DOC into labile (40%), semi-labile (37%) and refractory (23%) pools, suggesting that 77% of the DOC can be metabolized quickly after its production. The values of SUVA₂₅₄, spectral slope ratio, and HIX indicated that the aromaticity, molecular weight, and humic degree of DOM increased with biodegradation. The bioavailability of 4PARAFAC components followed the order of:tyrosine-> tryptophan-> fulvic acid-> humic acid-like component. Tyrosine-and tryptophan-like component accounted for a large proportion of the labile and semi-labile DOM, while the refractory DOM was mainly composed of fulvic-acid-and humic acid-like component. Synchronous fluorescence spectra combined with 2D-COS revealed that the fluorescent compounds with lower excitation wavelengths were preferentially biodegraded.

Key words： cyanobacterial blooms dissolved organic matter biodegradation EEM 2D-COS

Received: 01 February 2018

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	Articles by authors
	XU Ming
	LIU Wei-jing
	BAI Yong-gang
	TU Yong

Cite this article:

XU Ming,LIU Wei-jing,BAI Yong-gang等. Biodegradation of dissolved organic matter in Lake Taihu during cyanobacterial blooms[J]. CHINA ENVIRONMENTAL SCIENCECE, 2018, 38(9): 3494-3501.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2018/V38/I9/3494

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