Effect of photo-biodegradation and biodegradation on the biogeochemical cycling of dissolved organic matter across diverse surface water bodies

Sankar, M. S.1; Dash, Padmanava1; Singh, Shatrughan1; Lu, YueHan2,3; Mercer, Andrew E.1; Chen, Shuo2

2019-03

10.1016/j.jes.2018.06.021

Journal of Environmental Sciences   影响因子和分区

1001-0742

1878-7320

The objective of this research was to quantify the temporal variation of dissolved organic matter (DOM) in five distinct waterbodies in watersheds with diverse types of land use and land cover in the presence and absence of sunlight. The water bodies were an agricultural pond, a lake in a forested watershed, a man-made reservoir, an estuary, and a bay. Two sets of samples were prepared by dispensing unfiltered samples into filtered samples in 1:10 ratio (V/V). The first set was exposed to sunlight (10 hr per day for 30 days) for examining the combined effect of photo-biodegradation, while the second set was stored in dark for examining biodegradation alone. Spectroscopic measurements in tandem with multivariate statistics were used to interpret DOM lability and composition. The results suggest that the agricultural pond behaved differently compared to other study locations during degradation experiments due to the presence of higher amount of microbial humic-like and protein-like components derived from microbial/anthropogenic sources. For all samples, a larger decrease in dissolved organic carbon (DOC) concentration (10.12% +/- 9.81% for photo-biodegradation and 6.65% +/- 2.83% for biodegradation) and rapid transformation of DOM components (i.e., terrestrial humic-like components into microbial humic and protein-like components) were observed during photo-biodegradation experiments. Results suggest that sunlight facilitated DOM biodegradation, resulting in simpler recalcitrant molecules regardless of original composition. Overall, it was found that combined effects of light and bacteria are more efficient than bacterial effects alone in remineralizing and altering DOM, which highlights the crucial importance of sunlight in transforming aquatic DOM. (C) 2018 The Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences. Published by Elsevier B.V.

Photo-biodegradation Biodegradation Dissolved organic matter Land use and land cover Half-life EEM-PARAFAC

SCI ; EI

英语

其他

Environmental Sciences & Ecology

Environmental Sciences

WOS:000463374900013

SCIENCE PRESS

20182705408472

Agriculture ; Biogeochemistry ; Biological materials ; Dissolution ; Lakes ; Land use ; Multivariant analysis ; Organic carbon ; Proteins ; Reservoirs (water)

Urban and Regional Planning and Development:403 ; Reservoirs:441.2 ; Biotechnology:461.8 ; Geochemistry:481.2 ; Chemical Operations:802.3 ; Organic Compounds:804.1 ; Agricultural Equipment and Methods; Vegetation and Pest Control:821 ; Statistical Methods:922

Web of Science

1.Mississippi State Univ, Dept Geosci, Mississippi State, MS 39762 USA
2.Univ Alabama, Dept Geol Sci, Tuscaloosa, AL 35487 USA
3.Southern Univ Sci & Technol, Acad Adv Interdisciplinary Studies, Shenzhen 518055, Guangdong, Peoples R China

Sankar, M. S.,Dash, Padmanava,Singh, Shatrughan,et al. Effect of photo-biodegradation and biodegradation on the biogeochemical cycling of dissolved organic matter across diverse surface water bodies[J]. Journal of Environmental Sciences,2019,77:130-147.

Sankar, M. S.,Dash, Padmanava,Singh, Shatrughan,Lu, YueHan,Mercer, Andrew E.,&Chen, Shuo.(2019).Effect of photo-biodegradation and biodegradation on the biogeochemical cycling of dissolved organic matter across diverse surface water bodies.Journal of Environmental Sciences,77,130-147.

Sankar, M. S.,et al."Effect of photo-biodegradation and biodegradation on the biogeochemical cycling of dissolved organic matter across diverse surface water bodies".Journal of Environmental Sciences 77(2019):130-147.