Linking groundwater dissolved organic matter to sedimentary organic matter from a fluvio-lacustrine aquifer at Jianghan Plain, China by EEM-PARAFAC and hydrochemical analyses

Huang, Shuangbing; Wang, Yanxin; Ma, Teng; Tong, Lei; Wang, Yanyan; Liu, Changrong; Zhao, Lei

doi:10.1016/j.scitotenv.2015.05.051

Cited by 86 publications

(41 citation statements)

References 47 publications

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“…Kothawala et al, 2016). However, similar values of both BIX and HIX to the ones presented here have been reported previously in systems with low DOC concentrations and not very colored DOM, such as ground caves and spring waters (Birdwell and Engel, 2010;Simon et al, 2010) as well as in soils (Traversa et al, 2014) and some rivers (Huang et al, 2015). 5…”

Section: Discussionsupporting

confidence: 91%

“…For instance, riparian GW presented higher 30 humic-like fluorescence (i.e. higher values of HIX, F2 and F3) than stream water, which is in agreement with a recent study comparing stream and groundwater DOM (Huang et al, 2015). Moreover, the contribution of the protein-like component F1 to the total fluorescence was higher in stream water (50.6 %) than in riparian GW (43.9 %), while the contribution of F2, a ubiquitous humic component related with fulvic acids and re-processed humics, was higher in riparian GW (17.8 %) tan in stream water samples (13.1 %).…”

Section: Empirical Evidence Of In-stream Dom Processingsupporting

confidence: 90%

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Decoupling of dissolved organic matter patterns between stream and riparian groundwater in a headwater forested catchment

Bernal¹,

Lupon²,

Catalán³

et al. 2017

Preprint

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Abstract. Streams are important sources of carbon to the atmosphere, though whether they merely outgas terrestrially derived 10 carbon dioxide or mineralize terrestrial inputs of dissolved organic matter (DOM) is still a big challenge in ecology. The objective of this study was to investigate the influence of riparian groundwater (GW) and in-stream processes on the temporal pattern of stream DOM concentrations and quality in a forested headwater stream, and whether this influence differed between the leaf litter fall period (LLF) and the remaining part of the year (no-LLF). The spectroscopic indexes (fluorescence index, biological index, humification index, and PARAFAC components) indicated that DOM had an eminently protein-like character 15 and was most likely originated from microbial sources and recent biological activity in both stream water and riparian GW.However, paired samples of stream water and riparian GW showed that dissolved organic carbon (DOC) and nitrogen (DON) concentrations as well as the spectroscopic character of DOM differed between the two compartments throughout the year. A simple mass balance approach indicated that in-stream processes along the reach contributed to reduce DOC and DON fluxes by 50% and 30%, respectively. Further, in-stream DOC and DON uptake were unrelated to each other, suggesting that these 20 two compounds underwent different biogeochemical pathways. During the LLF period, stream DOC and DOC:DON ratios were higher than during the no-LLF period, and spectroscopic indexes suggested a major influence of terrestrial vegetation on stream DOM. Our study highlights that stream DOM is not merely a reflex of riparian GW entering the stream and that headwater streams have the capacity to internally produce, transform, and consume DOM.

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Section: Discussionsupporting

confidence: 91%

Section: Empirical Evidence Of In-stream Dom Processingsupporting

confidence: 90%

Decoupling of dissolved organic matter patterns between stream and riparian groundwater in a headwater forested catchment

Bernal¹,

Lupon²,

Catalán³

et al. 2017

Preprint

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“…Because of the diversity of landforms and geology covered, we believe these groundwater C values are likely substantially similar to the concentrations and distribution beneath other continents. Measurements of groundwater DOC (e.g., Huang et al 2015, Thayalakumaran et al 2015, Weigand et al 2017 and DIC (e.g., Chaillou et al 2014, Samanta et al 2015, Cao et al 2016) under other countries and continents, although rare, are in the same ranges as those in our survey. We determined the average C content at various depths by smoothing the depth versus groundwater age relationship using locally weighted sequential smoothing (Cleveland 1979) as described earlier.…”

Section: Introductionsupporting

confidence: 68%

Size, age, renewal, and discharge of groundwater carbon

Downing

Striegl

2018

Inland Waters

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Groundwater carbon (C) supply to lakes and streams is important to understanding the role of inland waters in global and regional cycles and in the functioning of aquatic ecosystems. We provide new estimates of the size and discharge of the groundwater C pool using data from a broad survey of groundwater C, information on the depth distribution of groundwater, and data on groundwater age. About 0.25 × 10 6 km 3 of the 8 × 10 6 km 3 of groundwater resource is within 100 m of the surface and 4.2 × 10 6 km 3 is above 2000 m. Ages show an average groundwater turnover time of 10 yr at 25 m, 350 yr at 100 m, increasing to about 100 000 yr at 600 m. Global groundwater discharge is 16 000 km 3 yr −1; >16% of precipitation passes through groundwater. Groundwater dissolved organic C (DOC) can be high in shallow groundwater but stabilizes at ~2-4 mg L −1 at 100 m. Average groundwater dissolved inorganic C (DIC) is ~30-43 mg L −1. Groundwater C content to 2000 m is ~145 Pg, about the same as all marine sediments and about one-sixth that of the surface ocean. Groundwater C discharge to continental waters is 0.68 Pg yr −1 , or 3.4 times that estimated from river base-flow and submarine groundwater discharge. This discharge is 68 times previous estimates, implying a total C flux from land of 3.6 Pg yr −1 ; 80% of discharge occurs from above 40 m and 99% from the upper 100 m.

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“…The location and outline of component 1 in this study was the same as what reported by Huang et al . 30 (λ Ex = 250 nm, λ Em = 434 nm) and defined as humic acid-like component 22 . A significant and positive relationship of Fmax of component 1 against the NBDOC, NBDON and SUVA 254 (Supplementary Figure S2a–c) suggested that this component was more difficult to be biodegraded than the other two components.…”

Section: Discussionmentioning

confidence: 99%

Antecedent soil moisture prior to freezing can affect quantity, composition and stability of soil dissolved organic matter during thaw

Cheng

et al. 2017

Sci Rep

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There are large amounts of dissolved organic matter (DOM) released into the soil during spring thaw, but its bioavailability and components are still unknown. The quantity, composition and stability of DOM in water extracts of forest soils during thaw were studied after two-month freezing with 9 levels of soil moisture ranging from 10% to 90% water-filled pore space (WFPS), by measuring soil carbon dioxide (CO2) flux, biodegradable dissolved organic carbon (BDOC) and nitrogen (BDON), ultraviolet absorbance and parallel factor analysis of fluorescence excitation-emission matrices. Concentrations of BDOC, BDON, DOC and DON were lowest around 30% WFPS and relatively higher and lower soil moisture both increased DOM and BDOM concentrations in thawing soil. With increasing WFPS, the dominant component of soil DOM changed from humic acid-like substances to fulvic acid-like substances and the biological origin of DOM increased gradually. The protein-like component accounted for 8–20% of soil DOM and was affected by vegetation type and WFPS singly and interactively. The results implied that forest soils with more than 50% WFPS before winter freezing could release large amounts of fulvic acid-like DOM, which would be easily biodegraded and emitted as CO2 or run off with ground water during spring snow thaw.

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Linking groundwater dissolved organic matter to sedimentary organic matter from a fluvio-lacustrine aquifer at Jianghan Plain, China by EEM-PARAFAC and hydrochemical analyses

Cited by 86 publications

References 47 publications

Decoupling of dissolved organic matter patterns between stream and riparian groundwater in a headwater forested catchment

Decoupling of dissolved organic matter patterns between stream and riparian groundwater in a headwater forested catchment

Size, age, renewal, and discharge of groundwater carbon

Antecedent soil moisture prior to freezing can affect quantity, composition and stability of soil dissolved organic matter during thaw

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