Abstract
Pioneer habitat-adapted bermudagrass is prevalent in the water-level-fluctuating zone of the Three Gorges Reservoir area. This study was performed to explore the response characteristics of dissolved organic matter (DOM) qualities to bermudagrass decomposition and their regulation in the distribution and release of mercury (Hg) and methylmercury (MeHg) in the soil-water system. Compared to the control, the bermudagrass decomposition resulted in a great increase in the protein-like components in the water in the initial stages (p < 0.01), but it also greatly reduced the humification degree of water DOM (p < 0.01). However, it accelerated the consumption of protein-like components, the humification rate, and the synthesis of humic-like DOM in the water over time. This changing pattern of the DOM qualities resulted in an initial elevation and a subsequent great decrease in the dissolved Hg and MeHg concentrations in the pore water, which ultimately reduced their release levels into the overlying water by 26.50% and 54.42%, respectively, compared to the control. Our results indicate the potential inhibitory effects of short-term bermudagrass decomposition caused by flooding and how decomposition affects the release of total Hg and MeHg by shaping the DOM qualities, and they have implications for similar aquatic systems in which herbaceous plants are frequently decomposed after submergence.
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References
Bao Y, Gao P, He X (2015) The water-level fluctuation zone of three Gorges reservoir – a unique geomorphological unit. Earth Sci Rev 150:14–24. https://doi.org/10.1016/j.earscirev.2015.07.005
Bravo AG, Bouchet S, Tolu J, Björn E, Mateosrivera A, Bertilsson S (2017) Molecular composition of organic matter controls methylmercury formation in boreal lakes. Nat Commun 8:14255. https://doi.org/10.1038/ncomms14255
Chen X, Zhang S, Liu D, Yu Z, Zhou S, Li R, Liu Z, Lin J (2019) Nutrient inputs from the leaf decay of Cynodon dactylon (L.) Pers in the water level fluctuation zone of a three Gorges tributary. Sci Total Environ 688:718–723. https://doi.org/10.1016/j.scitotenv.2019.06.357
Graham AM, Aiken GR, Gilmour CC (2013) Effect of dissolved organic matter source and character on microbial hg methylation in Hg-S-DOM solutions. Environ Sci Technol 47:5746–5754. https://doi.org/10.1021/es400414a
He M, Tian L, Braaten HFV, Wu QR, Luo J, Cai LM, Meng JH, Lin Y (2019) Mercury-organic matter interactions in soils and sediments: angel or devil? Bull Environ Contam Toxicol 102:621–627. https://doi.org/10.1007/s00128-018-2523-1
Helms JR, Stubbins A, Ritchie JD, Minor EC, Kieber DJ, Mopper K (2009) Absorption spectral slopes and slope ratios as indicators of molecular weight, source, and photobleaching of chromophoric dissolved organic matter. Limnol Oceanogr 54:955–969. https://doi.org/10.4319/lo.2008.53.3.0955
Hesterberg D, Chou JW, Hutchison KJ, Sayers DE (2001) Bonding of hg(II) to reduced organic sulfur in humic acid as affected by S/Hg ratio. Environ Sci Technol 35:2741–2745. https://doi.org/10.1021/es001960o
Hu J, Yang NL, He TR, Zhou X, Yin DL, Wang Y, Zhou LT (2023) Elevated methylmercury production in mercury-contaminated paddy soil resulted from the favorable dissolved organic matter variation created by algal decomposition. Environ Pollut 324:121415. https://doi.org/10.1016/j.envpol.2023.121415
Huguet A, Vacher L, Relexans S, Saubusse S, Froidefond JM, Parlanti E (2009) Properties of fluorescent dissolved organic matter in the Gironde Estuary. Org Geochem 40:706–719. https://doi.org/10.1016/j.orggeochem.2009.03.002
Jiang T, Bravo AG, Skyllberg U, Bjorn E, Wang DY, Yan HY, Green NW (2018) Influence of dissolved organic matter (DOM) characteristics on dissolved mercury (hg) species composition in sediment porewater of lakes from southwest China. Water Res 146:146–158. https://doi.org/10.1016/j.watres.2018.08.054
Kothawala DN, von Wachenfeldt E, Koehler B, Tranvik LJ (2012) Selective loss and preservation of lake water dissolved organic matter fluorescence during long-term dark incubations. Sci Total Environ 433:238–246. https://doi.org/10.1016/j.scitotenv.2012.06.029
Lapierre JF, Frenette JJ (2009) Effects of macrophytes and terrestrial inputs on fluorescent dissolved organic matter in a large river system. Aquat Sci 71:15–24. https://doi.org/10.1007/s00027-009-9133-2
Lavoie RA, Amyot M, Lapierre J-F (2019) Global meta-analysis on the relationship between mercury and dissolved organic carbon in freshwater environments. J Geophys Research: Biogeosciences 124:1508–1523. https://doi.org/10.1029/2018JG004896
Lei P, Nunes LM, Liu Y, Zhong H, Pan K (2019) Mechanisms of algal biomass input enhanced microbial hg methylation in lake sediments. Environ Int 126:279–288. https://doi.org/10.1016/j.envint.2019.02.043
Lei P, Zhang J, Zhu JJ, Tan QG, Kwong RWM, Pan K, Jiang T, Naderi M, Zhong H (2021) Algal organic matter drives methanogen-mediated methylmercury production in water from eutrophic shallow lakes. Environ Sci Technol 55:10811–10820. https://doi.org/10.1021/acs.est.0c08395
Liang L, Horvat M, Bloom NS (1994) An improved speciation method for mercury by GC/CVAFS after aqueous phase ethylation and room temperature precollection. Talanta 41:371–379. https://doi.org/10.1016/0039-9140(94)80141-x
Liang L, Horvat M, Feng XB, Shang LH, Li H, Pang P (2004) Re-evaluation of distillation and comparison with HNO3 leaching/solvent extraction for isolation of methylmercury compounds from sediment/soil samples. Appl Organomet Chem 18:264–270. https://doi.org/10.1002/aoc.617
Ohno T (2002) Fluorescence inner-filtering correction for determining the humification index of dissolved organic matter. Environ Sci Technol 36:742–746. https://doi.org/10.1021/es0155276
Pak K, Bartha R (1998) Products of mercury demethylation by sulfidogens and methanogens. Bull Environ Contam Toxicol 61:690–694. https://doi.org/10.1007/s001289900816
Schaefer JK, Morel FMM (2009) High methylation rates of mercury bound to cysteine by Geobacter sulfurreducens. Nat Geosci 2:123–126. https://doi.org/10.1038/ngeo412
Shu R, Dang F, Zhong H (2016) Effects of incorporating differently-treated rice straw on phytoavailability of methylmercury in soil. Chemosphere 145:457–463. https://doi.org/10.1016/j.chemosphere.2015.11.037
Stedmon CA, Markager S (2005) Resolving the variability in dissolved organic matter fluorescence in a temperate estuary and its catchment using PARAFAC analysis. Limnol Oceanogr 50:686–697. https://doi.org/10.4319/lo.2005.50.2.0686
Tang WL, Hintelmann H, Gu BH, Feng XB, Liu YR, Gao YX, Zhao JT, Zhu HK, Lei P, Zhong H (2019) Increased methylmercury accumulation in rice after straw amendment. Environ Sci Technol 53:6144–6153. https://doi.org/10.1021/acs.est.8b07145
Tang WL, Liu YR, Guan WY, Zhong H, Qu XM, Zhang T (2020) Understanding mercury methylation in the changing environment: recent advances in assessing microbial methylators and mercury bioavailability. Sci Total Environ 714:136827. https://doi.org/10.1016/j.scitotenv.2020.136827
Telliard W (2007) Mercury in water by oxidation, purge and trap, and cold vapor atomic fluorescence spectrometry. US EPA method, p 1631
Wang YM, Yin DL, Xiang YP, Xu QQ, Zhang C, Xie Q, Wang DY (2019) A review of studies on the biogeochemical behaviors of mercury in the three Gorges reservoir, China. Bull Environ Contam Toxicol 102:686–694. https://doi.org/10.1007/s00128-019-02586-1
Wang YJ, Wang ZG, Zheng XM, Zhou LM (2022) Influence of spartina alterniflora invasion on mercury storage and methylation in the sediments of Yangtze river estuarine wetlands. Estuar Coast Shelf Sci 265:107717. https://doi.org/10.1016/j.ecss.2021.107717
Weishaar JL, Aiken GR, Bergamaschi BA, Fram MS, Fujii R, Mopper K (2003) Evaluation of specific ultraviolet absorbance as an indicator of the chemical composition and reactivity of dissolved organic carbon. Environ Sci Technol 37:4702–4708. https://doi.org/10.1021/es030360x
Xiao LW, Zhu B, Kumwimba MN, Jiang SW (2017) Plant soaking decomposition as well as nitrogen and phosphorous release in the water-level fluctuation zone of the three Gorges reservoir. Sci Total Environ 592:527–534. https://doi.org/10.1016/j.scitotenv.2017.03.104
Xu QQ, Zhao L, Wang YM, Xie Q, Yin DL, Feng XB, Wang DY (2018) Bioaccumulation characteristics of mercury in fish in the three Gorges reservoir, China. Environ Pollut 243:115–126. https://doi.org/10.1016/j.envpol.2018.08.048
Yang J, Han MX, Zhao ZL, Jiang HC (2022) Positive priming effects induced by allochthonous and autochthonous organic matter input in the lake sediments with different salinity. Geophys Res Lett 49:e2021GL096133. https://doi.org/10.1029/2021GL096133
Acknowledgements
This work was supported by the Natural Science Foundation of China (Grant. Nos. 22166009 and 41877384), The Science and Technology Project of Guizhou Province (QKHJC [2020] 1Y187), and The Guizhou Provincial Science and Technology Development Project (QKZYD [2022]4022).
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Liu, E., Xue, J., Zhang, G. et al. Distribution and Release of Mercury Regulated by the Decomposition of a Pioneer Habitat-Adapted Plant in the Water-Level-Fluctuating Zone of the Three Gorges Reservoir. Bull Environ Contam Toxicol 111, 1 (2023). https://doi.org/10.1007/s00128-023-03760-2
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DOI: https://doi.org/10.1007/s00128-023-03760-2