Characterization of dissolved organic matter in submarine groundwater from a salt marsh in Chongming Island, China

He, Tangrong; Zhang, Fenfen; Wang, Yali; Chen, Xiaogang; Du, Jinzhou

doi:10.1007/s00343-021-0296-6

Cited by 9 publications

(3 citation statements)

References 78 publications

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“…The groundwater DOC concentration in western Guangdong was only higher than that on the coast of Taiwan Island (45 ± 20 μmol L −1 , Yang et al, 2015), the western coast of South Korea (72 ± 20 μmol L −1 , Kim et al, 2012). It was slightly lower than that on the coast of Hainan Island (114 ± 112 μmol L −1 , Wang et al, 2018), the southeastern coast of South Korea (139 ± 23 μmol L −1 , Oh et al, 2017), and Chongming Island (212 ± 170 μmol L −1 , He et al, 2022), but significantly lower than that in southern Guangxi (732-1,184 μmol L −1 , Chen et al, 2018), America (196-1,020 μmol L −1 , Goodridge, 2018;Pain et al, 2019;Qi et al, 2018;Porubsky et al, 2014;Suryaputra et al, 2015), Australia (369-882 μmol L −1 , Maher et al, 2013;Stewart et al, 2015;Webb et al, 2019), Indian islands (318 μmol L −1 , Tedetti et al, 2011) and Europe (334-483 μmol L −1 , Szymczycha et al, 2014;Ibánhez et al, 2021). Overall, the groundwater with low DOC concentration collected in western Guangdong was freshwater (salinity = 0, Table 1), while the majority of the Frontiers in Environmental Science frontiersin.org other coastal groundwaters with high DOC levels were significantly affected by seawater intrusion and were termed recirculated seawater (Figure 8).…”

Section: Factors Affecting the Sources Compositions And Levels Of Dom...mentioning

confidence: 82%

Sources, spectral characteristics, and fluxes of dissolved organic matter in coastal groundwater and river water in western Guangdong, China

Wang

Hu²,

Liu³

et al. 2022

Front. Environ. Sci.

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Groundwater discharge and river runoff are two important ways for allochthonous dissolved organic matter (DOM) to enter the ocean, but they vary spatially. Currently, the source, composition, and efflux of groundwater and riverine dissolved organic matter to the tropical northern South China Sea remain poorly understood, preventing an accurate estimate of coastal carbon budgets. In July 2021, nine groundwater and six river water samples were collected along the coast of western Guangdong and were characterized using dissolved organic carbon (DOC) analysis, UV-visible, and fluorescence spectroscopy techniques. Atypical absorption spectra were strongly observed in groundwaters, which were mainly attributed to the high-level nitrates. An exponential-Gaussian equation showed that the average contribution of nitrate to total groundwater absorbances was up to 36% at ∼ 300 nm. Groundwater showed lower levels of DOC, colored dissolved organic matter (CDOM), and fluorescent dissolved organic matter (FDOM) as compared to river water, whereas the humic-like components dominated both groundwater and river water FDOM pools. Higher values of spectral slope S350–400, fluorescence index, biological index, and the ratio of two humic-like fluorescence jointly reveal that groundwater DOM mainly originated from microbial activities, whereas the river water DOM had considerable contribution from terrestrial soil. High precipitation, natural or agricultural land types, and a lack of seawater intrusion are expected to cause low levels of groundwater DOM in western Guangdong. Among 52 rivers from across the globe, high watershed productivity and precipitation may lead to high–moderate DOM levels in river water in western Guangdong. The DOM fluxes via fresh groundwater discharge in western Guangdong are comparable in magnitude to those by river runoff, accounting for 16%–18% of the Pearl River DOM fluxes. Based on the slopes of linear correlations between CDOM and DOC obtained in groundwater samples and 52 rivers, as well as the data on water fluxes and DOC levels, the global CDOM fluxes via groundwater discharge and river runoff are estimated to be 3.5–12.2 × 1012 m2 yr−1 and 4.3 ± 0.3 × 1014 m2 yr−1, respectively, highlighting the importance of considering groundwater discharge and river runoff in coastal carbon budgets.

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Section: Factors Affecting the Sources Compositions And Levels Of Dom...mentioning

confidence: 82%

Sources, spectral characteristics, and fluxes of dissolved organic matter in coastal groundwater and river water in western Guangdong, China

Wang

Hu²,

Liu³

et al. 2022

Front. Environ. Sci.

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“…Conservative mixing models along a salinity gradient can be used to interpret carbon sources and sinks in estuaries (He et al 2021;Reithmaier et al 2021). We found considerable seasonal variation in surface-water carbon dynamics and drivers (Fig.…”

Section: Drivers Of Surface-water Carbon Dynamicsmentioning

confidence: 99%

Pore‐water exchange flushes blue carbon from intertidal saltmarsh sediments into the sea

Chen

Santos

et al. 2022

Limnol Oceanogr Letters

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We quantified whether pore‐water exchange flushes out saltmarsh sediment carbon, driving carbon outwelling into the ocean and outgassing into the atmosphere. Radon‐derived pore‐water exchange released 1.8 times more sediment carbon in the wet than in dry season. Both crab burrow flushing and delayed seepage of surface water infiltrating sediments during the spring tide released sediment carbon to surface waters. The outwelling flux of dissolved inorganic carbon exceeded dissolved organic carbon. Carbon dioxide and methane emissions were 169 and 0.25 mmol m−2 d−1, respectively. Pore‐water carbon fluxes exceeded carbon outwelling. This requires some carbon processing within the saltmarsh (e.g., degradation or outgassing to the atmosphere) before pore‐water carbon is exported to the ocean. Overall, pore‐water exchange and outwelling are key components of saltmarsh carbon budgets and should be considered when assessing their carbon sequestration potential and strategies to mitigate climate change.

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“…In these studies, DOC is incubated in an environment where microorganisms are present, and during the incubation process, the amount of DOC gradually decreases until a relatively small amount remains unchanged, and this remaining amount is the DOC that is difficult for microorganisms to degrade and utilize, and can be regarded as the amount of RDOC. This DOC degradation method has been widely used in assessing the bioavailability of DOC in rainwater [23], drinking water [21,24], as well as some natural water such as oceans [25], rivers [26], streams [27,28], groundwater [29,30], and salt marshes [31]. In aquaculture systems, studies on RDOC have mainly focused on coastal shellfish and algal aquaculture [32][33][34], while research on aquaculture ponds has been rare.…”

Section: Introductionmentioning

confidence: 99%

Composition, Dynamic Changes, and Carbon Sequestration Effects of Organic Carbon in the Water of a Penaeus vannamei Culture Pond

Huang,

Jiang,

Shan

et al. 2024

Water

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To investigate the composition, dynamic changes, and carbon sequestration effects of organic carbon in the water of Penaeus vannamei aquaculture ponds, changes in organic carbon were assessed in the water of the P. vannamei pond monoculture and integrated P. vannamei–Mercenaria mercenaria pond aquaculture systems during an aquaculture period. RDOC (refractory dissolved organic carbon) was determined using the DOC (dissolved organic carbon) degradation method, and the organic carbon composition in the water and its relationship with environmental factors were analyzed. The results showed the following: (1) The aquaculture activities significantly increased the DOC, POC (particulate organic carbon), and RDOC contents in the water and decreased the proportions of RDOC in the water. The DOC, POC, RDOC contents, and RDOC proportions in the monoculture systems were higher than those of the integrated aquaculture systems. (2) DOC, POC, RDOC contents, and RDOC proportions in the water were significantly positively correlated with chlorophyll-a contents in both aquaculture systems and significantly negatively correlated with water temperature and salinity. (3) Based on the average content and proportion of RDOC in the water of the two aquaculture systems, it was calculated that approximately an average of 108.64 kg of RDOC was present per hectare of P. vannamei aquaculture water during the aquaculture period.

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Characterization of dissolved organic matter in submarine groundwater from a salt marsh in Chongming Island, China

Cited by 9 publications

References 78 publications

Sources, spectral characteristics, and fluxes of dissolved organic matter in coastal groundwater and river water in western Guangdong, China

Sources, spectral characteristics, and fluxes of dissolved organic matter in coastal groundwater and river water in western Guangdong, China

Pore‐water exchange flushes blue carbon from intertidal saltmarsh sediments into the sea

Composition, Dynamic Changes, and Carbon Sequestration Effects of Organic Carbon in the Water of a Penaeus vannamei Culture Pond

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