Dissolved inorganic carbon and its isotopic differentiation in cascade reservoirs in the Wujiang drainage basin

Yu, YuanXiu; Liu, Cong‐Qiang; Wang, Fushun; Wang, BaoLi; Li, Jun; Li, SiLiang

doi:10.1007/s11434-008-0348-8

Cited by 13 publications

(5 citation statements)

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“…4). These provide strong evidence that the lighter carbon in DIC was consumed by aquatic photosynthesis, and in turn produced more DOC, which was similar to the study of some reservoirs in the karst region of Southwestern China (Yu et al ., ).…”

Section: Discussionmentioning

confidence: 99%

Spatiotemporal variations of dissolved inorganic carbon and controlling factors in a small karstic catchment, Southwestern China

Qin

Yue

et al. 2019

Earth Surf Processes Landf

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Dissolved inorganic carbon (DIC) is the most important carbon component in karst aquatic system where fluid is highly transmissive, but has rarely been examined in the subtropical karst critical zone (K‐CZ). In this study, concentrations of dissolved solutes and isotopic compositions of DIC (δ13CDIC) at 11 sites of a 73.4 km2 karstic catchment in Southwestern China were analysed monthly in order to uncover the spatiotemporal variations of both DIC and its dominant sources, and to identify relevant controlling factors. Both DIC concentrations and δ13CDIC were highly variable, ranging from 2.52 to 5.85 mmol l−1 and from −15.7 to −4.5‰, respectively. DIC in underground water (UGW) was higher in concentration and more depleted in 13C compared to surface water (SFS). DIC concentrations showed an inconsistent seasonal trend with other solutes, with higher values in the wet season at some sites. δ13CDIC values were lower in the wet season than in the dry season. The results of mixing model IsoSource revealed spatiotemporal patterns of DIC sources. During the dry season, carbonate weathering was the primary contributor to DIC in UGW (excluding in the middle reaches). However, during the wet season, soil CO2 was the dominant source of DIC in both UGW and SFS, and it was higher than in the dry season. Overall, there are significant spatiotemporal disparities and highly transmissive characteristics of both DIC and its sources in the K‐CZ, which are controlled by multiple factors. This study also highlights that rainfall may play a crucial role in accelerating carbon dynamics in the K‐CZ. High‐frequency sampling campaigns in high‐flow periods and deep analyses are needed in future work to elucidate the related processes and mechanisms. © 2019 John Wiley & Sons, Ltd.

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Section: Discussionmentioning

confidence: 99%

Spatiotemporal variations of dissolved inorganic carbon and controlling factors in a small karstic catchment, Southwestern China

Qin

Yue

et al. 2019

Earth Surf Processes Landf

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“…Yu et al () studied three reservoirs in China for carbon cycling trends over various depths. The δ 13 C DIC trend was highly enriched approximately −4‰ to −6‰ at the surfaces during the summer (Yu et al, ). This extremely enriched DIC provides one possible explanation for the anomalously enriched sample (Greensburg July 29, 2013) of δ 13 C DIC = –6.5‰.…”

Section: Discussionmentioning

confidence: 99%

Dissolved inorganic carbon sourcing using δ¹³C_DIC from a karst influenced river system

McClanahan

Polk

Groves

et al. 2015

Earth Surf Processes Landf

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Rivers, representing the primary conduits of dissolved inorganic carbon (DIC) from the continents to the oceans, are important components to the global carbon cycle. To better understand the complex carbon cycling dynamics within two nested, mixed lithology watersheds, two sites were studied along the karst influenced upper Green River in south‐central Kentucky, USA. Weekly samples were collected from June 2013 through May 2014 and analyzed for δ13CDIC. The mixing model IsoSource was employed to better understand source partitioning differences over seasonal time spans and across the two nested basins. In both the lithologically mixed upstream basin (53% carbonate rocks, 47% siliciclastic) and carbonate rock dominated downstream basin (96% carbonate rocks in the drainage area between Greensburg and Munfordville, 78% in the total area upstream from Munfordville), DIC was primarily derived from soil respiration. The proportion of DIC from dissolved carbonate minerals derived from the downstream carbonate rock dominated basin was similar to the upstream basin, due to carbonate mineral dissolution having such a consistent effect on the overall DIC content of the river. Seasonally, soil respiration provided the most DIC from fall to winter. Early spring precipitation, combined with limited seasonal photosynthesis, shifted groundwater to be the primary source of DIC, bringing in a flush of carbonate mineral‐rich water during higher flows. This study provides insight into carbon dynamics across multiple lithologies and the important influence of seasonality using carbon isotope sourcing to determine carbonate mineral dissolution variability and aid in understanding its contribution to global carbon flux quantification. Copyright © 2015 John Wiley & Sons, Ltd.

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“…In natural water bodies, the concentration of HCO 3 − is much lower than 2.0 mmol L −1 [9]. Thus, we also deduced that the difference in carbon isotopic fractionation is large between algae with high CAex activity and that without CAex activity.…”

Section: Stable Carbon Isotope Composition With and Without Acetazolamentioning

confidence: 60%

Effect of acetazolamide on stable carbon isotope fractionation in Chlamydomonas reinhardtii and Chlorella vulgaris

et al. 2011

Chin. Sci. Bull.

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The effect of extracellular carbonic anhydrase (CAex) on stable carbon isotope fractionation in algae is still unclear. The stable carbon isotope composition and algal growth in the presence and absence of the membrane-impermeable CA inhibitor acetazolamide were compared in Chlamydomonas reinhardtii and Chlorella vulgaris. The CAex of both algal species contributed about 9‰ of the stable carbon isotope fractionation and exhibited a dosage effect. Therefore, evidence in vivo that CAex leads to a larger carbon isotope fractionation of algae is presented. The isotopic composition of sedimented algal material is an indicator of paleoenvironmental conditions because of the well-documented effect of CO 2 concentration on marine algal carbon fractionation [1][2][3]. However, use of existing models for prediction of algal carbon isotope fractionation revealed a large deviation in some aquatic ecosystems [4]. This deviation, if not considered in prediction models, would affect the precision of predictions of paleoenvironmental CO 2 concentrations based on the carbon isotope composition.The deviation from the model-predicted isotope fractionation results not only from environmental factors, but also from some important physiological factors. Extracellular carbonic anhydrase action might be one of the main physiological processes that lead to the deviation. Carbonic anhydrase (CA; EC 4.2.1.1), a zinc-containing metalloenzyme, catalyzes the reversible interconversion between bicarbonate (HCO 3 − ) and CO 2 . The uncatalyzed, slow interconversion between CO 2 and HCO 3 − produced about 10‰ of the stable carbon isotope fractionation, whereas the interconversion in vitro catalyzed by CA had only 1.1‰ fractionation [5,6].The present study examines the effects of extracellular CA (CAex) on carbon isotope fractionation by comparison of the stable carbon isotope composition and algal growth with and without the membrane-impermeable CA inhibitor acetazolamide (AZ) in Chlamydomonas reinhardtii and Chlorella vulgaris. Evidence in vivo showed that extracellular CA leads to higher algal carbon isotope fractionation.

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Dissolved inorganic carbon and its isotopic differentiation in cascade reservoirs in the Wujiang drainage basin

Cited by 13 publications

References 32 publications

Spatiotemporal variations of dissolved inorganic carbon and controlling factors in a small karstic catchment, Southwestern China

Spatiotemporal variations of dissolved inorganic carbon and controlling factors in a small karstic catchment, Southwestern China

Dissolved inorganic carbon sourcing using δ¹³C_DIC from a karst influenced river system

Effect of acetazolamide on stable carbon isotope fractionation in Chlamydomonas reinhardtii and Chlorella vulgaris

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Dissolved inorganic carbon and its isotopic differentiation in cascade reservoirs in the Wujiang drainage basin

Cited by 13 publications

References 32 publications

Spatiotemporal variations of dissolved inorganic carbon and controlling factors in a small karstic catchment, Southwestern China

Spatiotemporal variations of dissolved inorganic carbon and controlling factors in a small karstic catchment, Southwestern China

Dissolved inorganic carbon sourcing using δ13CDIC from a karst influenced river system

Effect of acetazolamide on stable carbon isotope fractionation in Chlamydomonas reinhardtii and Chlorella vulgaris

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Dissolved inorganic carbon sourcing using δ¹³C_DIC from a karst influenced river system