气候变化领域集成服务门户(CCPortal): Contrasting responses of DOM leachates to photodegradation observed in plant species collected along an estuarine salinity gradient

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DOI	10.1007/s10533-021-00756-0
	Contrasting responses of DOM leachates to photodegradation observed in plant species collected along an estuarine salinity gradient
	Schafer T.; Powers L.; Gonsior M.; Reddy K.R.; Osborne T.Z.
发表日期	2021
ISSN	1682563
起始页码	291
结束页码	307
卷号	152 期号:2021-02-03
英文摘要	A series of abiotic processes affected by salinity changes involve light-mediated reactions and different degradation pathways of organic compounds, including altered photo-oxidation, photo-degradation, and photolysis of organic matter (OM). Sunlight is known to degrade, oxidize, or mineralize dissolved organic matter (DOM) in waterways, creating large changes in compositional structure of DOM near the water surface and ultimately in the mixed layer. DOM derived from various vegetation types has differing levels of susceptibility to photolytic degradation depending on initial chemical composition and in what matrix degradation takes place (e.g., salinity). The effect of sunlight and salinity on degradation of leached DOM derived from three dominant vegetative species, Avicennia germinans, Juncus romerianus, and Taxodium distichum, along a riverine continuum in northeast Florida was determined. Leachates from these three sources in a deionized or seawater matrix were irradiated in a continuous flow-through photolytic system over the course of 20 h. Avicennia germinans and Juncus roemerinaus DOM readily degraded as indicated by decreases in absorbance across all wavelengths during the irradiation period, while Taxodium distichum DOM was found to increase in absorbance across all wavelengths in the freshwater matrix, but not in seawater. PARAFAC analysis indicated differences in photochemical components and % change of absorbance and fluorescence over time indicate the importance and variability of individual contributions to the DOM pool across an estuarine continuum. This work characterizes the photochemical properties of three individual DOM sources, exhibits the need for further research on this topic, and explores the salinity effect on photo-degradation of DOM from unique plant-derived DOM. © 2021, The Author(s).
英文关键词	Aquatic continuum; DOM; PARAFAC; Photochemistry
语种	英语
来源期刊	Biogeochemistry
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/184625
作者单位	Estuarine Biogeochemistry Laboratory, Whitney Laboratory for Marine Biosciences, University of Florida, St. Augustine, FL, United States; Wetland Biogeochemistry Laboratory, Soil and Water Sciences Department, University of Florida, Gainesville, FL, United States; Chesapeake Biological Laboratory, University of Maryland Center for Environmental Science, Solomons, MD, United States
推荐引用方式 GB/T 7714	Schafer T.,Powers L.,Gonsior M.,et al. Contrasting responses of DOM leachates to photodegradation observed in plant species collected along an estuarine salinity gradient[J],2021,152(2021-02-03).
APA	Schafer T.,Powers L.,Gonsior M.,Reddy K.R.,&Osborne T.Z..(2021).Contrasting responses of DOM leachates to photodegradation observed in plant species collected along an estuarine salinity gradient.Biogeochemistry,152(2021-02-03).
MLA	Schafer T.,et al."Contrasting responses of DOM leachates to photodegradation observed in plant species collected along an estuarine salinity gradient".Biogeochemistry 152.2021-02-03(2021).