Investigation on depth-dependent properties and benthic effluxes of dissolved organic matter (DOM) in pore water from plateau lake sediments

Dissolved organic matter (DOM) in sediment pore water plays a key role in lake water quality, complexation of the contaminants, biogeochemical cycles, and even climate. To better understand the vertical dynamics and characteristics of DOM among pore water profiles, we investigated concentrations, ch...

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Autores principales:	Shuaidong Li, Lingfeng Lu, Yongfang Wu, Zhilong Zhao, Changchun Huang, Tao Huang, Hao Yang, Xiaohua Ma, Quanliang Jiang
Formato:	article
Lenguaje:	EN
Publicado:	Elsevier 2021
Materias:	Pore water Dissolved organic matter UV–vis absorption spectroscopy Three-dimensional fluorescence matrix spectroscopy Depth Ecology QH540-549.5
Acceso en línea:	https://doaj.org/article/09387f501f7d4d3bb2904a91577e2ea1
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spelling	oai:doaj.org-article:09387f501f7d4d3bb2904a91577e2ea12021-12-01T04:47:26ZInvestigation on depth-dependent properties and benthic effluxes of dissolved organic matter (DOM) in pore water from plateau lake sediments1470-160X10.1016/j.ecolind.2021.107500https://doaj.org/article/09387f501f7d4d3bb2904a91577e2ea12021-06-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S1470160X21001655https://doaj.org/toc/1470-160XDissolved organic matter (DOM) in sediment pore water plays a key role in lake water quality, complexation of the contaminants, biogeochemical cycles, and even climate. To better understand the vertical dynamics and characteristics of DOM among pore water profiles, we investigated concentrations, chemical structures, and benthic fluxes of DOM in plateau lake sediments via stoichiometric analysis, ultraviolet–visible (UV–vis) absorption, three-dimensional fluorescence matrix spectroscopy (EEMs), and parallel factor model (PARAFAC). The results revealed that dissolved organic carbon (DOC), concurrent with chromophoric DOM (CDOM) and fluorescent DOM (FDOM), tended to accumulate in the anaerobic deeper layers. These trends also demonstrated a good agreement with the ammonium nitrogen (NH4+-N) concentration, implying that the pathway of DOM dynamics was closely related to the redox state. The EEMs-PARAFAC model revealed that DOM in pore water mostly consisted of two terrestrial humic-like components (average contribution:> 60%) followed by microbial and tryptophan-like components, respectively. Terrestrial humic-like components were relatively stable, and their abundance was positively correlated with the FDOM level (p < 0.05). The changes of aromatic, molecular weight, and humification degree of DOM were possibly driven by microbial activities at different depths. Moreover, benthic flux estimations indicated that DOM and the total dissolved nitrogen (TDN) in inland sediments were potential sources for the overlying water and possibly affected the quality and ecological safety of lake water bodies.Shuaidong LiLingfeng LuYongfang WuZhilong ZhaoChangchun HuangTao HuangHao YangXiaohua MaQuanliang JiangElsevierarticlePore waterDissolved organic matterUV–vis absorption spectroscopyThree-dimensional fluorescence matrix spectroscopyDepthEcologyQH540-549.5ENEcological Indicators, Vol 125, Iss , Pp 107500- (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Pore water Dissolved organic matter UV–vis absorption spectroscopy Three-dimensional fluorescence matrix spectroscopy Depth Ecology QH540-549.5
spellingShingle	Pore water Dissolved organic matter UV–vis absorption spectroscopy Three-dimensional fluorescence matrix spectroscopy Depth Ecology QH540-549.5 Shuaidong Li Lingfeng Lu Yongfang Wu Zhilong Zhao Changchun Huang Tao Huang Hao Yang Xiaohua Ma Quanliang Jiang Investigation on depth-dependent properties and benthic effluxes of dissolved organic matter (DOM) in pore water from plateau lake sediments
description	Dissolved organic matter (DOM) in sediment pore water plays a key role in lake water quality, complexation of the contaminants, biogeochemical cycles, and even climate. To better understand the vertical dynamics and characteristics of DOM among pore water profiles, we investigated concentrations, chemical structures, and benthic fluxes of DOM in plateau lake sediments via stoichiometric analysis, ultraviolet–visible (UV–vis) absorption, three-dimensional fluorescence matrix spectroscopy (EEMs), and parallel factor model (PARAFAC). The results revealed that dissolved organic carbon (DOC), concurrent with chromophoric DOM (CDOM) and fluorescent DOM (FDOM), tended to accumulate in the anaerobic deeper layers. These trends also demonstrated a good agreement with the ammonium nitrogen (NH4+-N) concentration, implying that the pathway of DOM dynamics was closely related to the redox state. The EEMs-PARAFAC model revealed that DOM in pore water mostly consisted of two terrestrial humic-like components (average contribution:> 60%) followed by microbial and tryptophan-like components, respectively. Terrestrial humic-like components were relatively stable, and their abundance was positively correlated with the FDOM level (p < 0.05). The changes of aromatic, molecular weight, and humification degree of DOM were possibly driven by microbial activities at different depths. Moreover, benthic flux estimations indicated that DOM and the total dissolved nitrogen (TDN) in inland sediments were potential sources for the overlying water and possibly affected the quality and ecological safety of lake water bodies.
format	article
author	Shuaidong Li Lingfeng Lu Yongfang Wu Zhilong Zhao Changchun Huang Tao Huang Hao Yang Xiaohua Ma Quanliang Jiang
author_facet	Shuaidong Li Lingfeng Lu Yongfang Wu Zhilong Zhao Changchun Huang Tao Huang Hao Yang Xiaohua Ma Quanliang Jiang
author_sort	Shuaidong Li
title	Investigation on depth-dependent properties and benthic effluxes of dissolved organic matter (DOM) in pore water from plateau lake sediments
title_short	Investigation on depth-dependent properties and benthic effluxes of dissolved organic matter (DOM) in pore water from plateau lake sediments
title_full	Investigation on depth-dependent properties and benthic effluxes of dissolved organic matter (DOM) in pore water from plateau lake sediments
title_fullStr	Investigation on depth-dependent properties and benthic effluxes of dissolved organic matter (DOM) in pore water from plateau lake sediments
title_full_unstemmed	Investigation on depth-dependent properties and benthic effluxes of dissolved organic matter (DOM) in pore water from plateau lake sediments
title_sort	investigation on depth-dependent properties and benthic effluxes of dissolved organic matter (dom) in pore water from plateau lake sediments
publisher	Elsevier
publishDate	2021
url	https://doaj.org/article/09387f501f7d4d3bb2904a91577e2ea1
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Investigation on depth-dependent properties and benthic effluxes of dissolved organic matter (DOM) in pore water from plateau lake sediments

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