Nutrient and eutrophication characteristics of the Dongshan Bay, South China

Chen, Baohong; Ji, Weidong; Zhou, Kaiwen; He, Qing; Fu, Ting-Ting

doi:10.1007/s00343-014-3214-3

Cited by 21 publications

(7 citation statements)

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“…Increasing P concentrations and lower N:P ratios have also been reported in some freshwater ecosystems with low nutrient cycling (mostly lakes and ponds) near areas with high human populations, industrial activities, and/or intensely managed cropland without waste treatment plants (Peñuelas et al, 2013c;Guenther et al, 2015;Yang et al, 2015;Choquette et al, 2019). In contrast, the N:P ratios tend to increase in terrestrial non-cropland ecosystems, such as forests and unmanaged grasslands (Veresoglou et al, 2014;Du et al, 2016;Wang et al, 2017c;Schmitz et al, 2019), large rivers and lakes (Li and Bush, 2015;Pandey and Pandey, 2015;Burson et al, 2016;Tong et al, 2019) and coastal areas (Chen et al, 2014b;Leong et al, 2014;Zirino et al, 2016;Maranger et al, 2018).…”

Section: Anthropogenically Mediated Imbalances In N:p Ratios and P Sc...mentioning

confidence: 94%

Recent advances and future research in ecological stoichiometry

Sardans

Janssens

Ciais

et al. 2021

Perspectives in Plant Ecology, Evolution and Systematics

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Section: Anthropogenically Mediated Imbalances In N:p Ratios and P Sc...mentioning

confidence: 94%

Recent advances and future research in ecological stoichiometry

Sardans

Janssens

Ciais

et al. 2021

Perspectives in Plant Ecology, Evolution and Systematics

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“…The study of N and P concentrations and N:P ratios in rivers and basins allows the analysis of the effects of multiple human activities on nutrient budgets (Zhang, Li, & Li, ; Zhang, Liu, et al, ) across a range of land uses (Romero et al, ; Sardans et al, ; Zhang, Li, et al, ; Figure ). Environments where N is transported by aquatic systems, such as in the lower stretches of rivers and estuaries (Capriulo et al, ; Chai, Yu, Song, & Cao, ; Harrison, Yin, Lee, Gan, & Liu, ; Li et al, ; Turner, Rabalais, Justic, & Dortch, ; Yin & Harrison, ; Zhang et al, ) and along coasts (Chen, Ji, Zhou, He, & Fu, ; Lipizer, Cossarini, Falconi, Solidoro, & Fonda Umani, ; Turner, Rabalais, & Justic, ; Wei & Huang, ; Yin, Song, Sun, & Wu, ), or by deposition, such as in remote lakes (Arbuckle & Downing, ; Hessen, Andersen, Larsen, Skjelkvale, & Wit, ; Liess, Drakare, & Kahlert, ) and forest and grassland ecosystems (Du et al, ; Fenn et al, ; Franzaring, Holz, Zipperle, & Fangmeier, ; Prietzel & Stetter, ; Schmitz et al, ; Veresoglou et al, ; Wang, Sardans, et al, ), tend to be enriched more rapidly by N than P, thereby increasing the N:P ratios (Figure ). This trend has been exacerbated by the progressive replacement of P‐rich with N‐rich detergents (Sardans et al, and references therein).…”

Section: Shifts In N:p Ratios Mediated By Anthropogenic Drivers Of Glmentioning

confidence: 99%

Anthropogenic global shifts in biospheric N and P concentrations and ratios and their impacts on biodiversity, ecosystem productivity, food security, and human health

Peñuelas

Janssens

Ciais

et al. 2020

Global Change Biology

172

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The availability of carbon (C) from high levels of atmospheric carbon dioxide (CO2) and anthropogenic release of nitrogen (N) is increasing, but these increases are not paralleled by increases in levels of phosphorus (P). The current unstoppable changes in the stoichiometries of C and N relative to P have no historical precedent. We describe changes in P and N fluxes over the last five decades that have led to asymmetrical increases in P and N inputs to the biosphere. We identified widespread and rapid changes in N:P ratios in air, soil, water, and organisms and important consequences to the structure, function, and biodiversity of ecosystems. A mass‐balance approach found that the combined limited availability of P and N was likely to reduce C storage by natural ecosystems during the remainder of the 21st Century, and projected crop yields of the Millennium Ecosystem Assessment indicated an increase in nutrient deficiency in developing regions if access to P fertilizer is limited. Imbalances of the N:P ratio would likely negatively affect human health, food security, and global economic and geopolitical stability, with feedbacks and synergistic effects on drivers of global environmental change, such as increasing levels of CO2, climatic warming, and increasing pollution. We summarize potential solutions for avoiding the negative impacts of global imbalances of N:P ratios on the environment, biodiversity, climate change, food security, and human health.

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“…Nutrients, including dissolved inorganic phosphate (DIP), dissolved inorganic nitrogen (DIN), and dissolved inorganic silicon (DSi), were collected in a 500‐mL polyethylene (PE) bottle and stored at 2–4°C before measurement within 12 hr of sampling. Nutrients were measured using a 723C spectrophotometer (Shanghaijingke®, China) and following national standard colorimetric methods (Chen et al., 2014) with an accuracy of <±10%.…”

Section: Methodsmentioning

confidence: 99%

Enhanced Regional Variability of Seawater pCO₂ Under Human and Natural Interference in a Nearshore Coral Nature Reserve (Dongshan Island, China)

et al. 2023

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It has been established that coral reef flats are mainly sources of atmospheric CO 2 due to the high biocalcification of coral reef communities in relation to low net fixation of CO 2 via photosynthesis (Gattuso, Frankignoulle, et al., 1999 and references therein). Recent observations in Great Barrier Reef and Hawaii tropical coral reefs confirm this overall trend (Lønborg et al., 2019;Terlouw et al., 2019), although localized processes make the drivers more complex. The global CO 2 emission from coral reefs is roughly estimated at 7 Megatons of carbon per year, based on field measurements from a "reference" reef in Moorea, French Polynesia (Gattuso et al., 1993;Spalding et al., 2001). It is worth noting that approximately 0.6 mol CO 2 was released when 1 mol CaCO 3 precipitates over a "standard" reef flat, where net community production (NCP) was close to zero in a daily cycle (Kinsey, 1983;Ware et al., 1992). However, it is possible that the release of CO 2 could be much lower, or even negative, in algae-dominated coral reefs, which may exhibit a "sink" pattern for atmospheric CO 2 (Frankignoulle Abstract CO 2 signatures differ among locations, even within the same coastal habitat. However, the driving mechanism behind this variation is not well understood due to the presence of both human and natural stresses. This study examines seawater pCO 2 and its deviation from the regional average (defined as pCO 2 anomaly) during spring, summer, and winter at two contrasting zones (trial and core zones) of Dongshan coral habitat. The impact of solar, tidal, and biological cycles on pCO 2 anomaly is relatively small under the designed sampling scheme. Results show that there is a large positive pCO 2 anomaly in the turbid water of the trial zone during all studied seasons, while the large negative pCO 2 anomaly in the core zone only occurs during the summer upwelling season. This indicates that CO 2 signatures among locations may have seasonality. The physical and biological contributors to pCO 2 anomaly are then quantitatively revealed based on a first-order Taylor decomposition and biological carbon metabolisms. The results suggest that organic carbon metabolism of marine phytoplankton dominated pCO 2 anomaly in all three seasons, while inorganic carbon metabolism also enlarged pCO 2 anomaly, especially during summer. Physical contributions were minor. Moreover, significant linear correlations between turbidity (related to local human activities), chlorophyll (related to coastal upwelling) and changes in dissolved inorganic carbon (induced by organic carbon metabolism) indicate human and natural influences on bioprocesses, which may enhance pCO 2 anomaly. Finally, the Dongshan coral habitat was estimated as a source of atmospheric CO 2 , with an annual efflux of approximately 50 t C. Plain Language SummaryPrevious studies have shown that CO 2 levels in seawater vary depending on location, and even within the same habitat. However, it is still unclear why this happens, as human activities and natural processes overlap...

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Nutrient and eutrophication characteristics of the Dongshan Bay, South China

Cited by 21 publications

References 18 publications

Recent advances and future research in ecological stoichiometry

Recent advances and future research in ecological stoichiometry

Anthropogenic global shifts in biospheric N and P concentrations and ratios and their impacts on biodiversity, ecosystem productivity, food security, and human health

Enhanced Regional Variability of Seawater pCO₂ Under Human and Natural Interference in a Nearshore Coral Nature Reserve (Dongshan Island, China)

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Nutrient and eutrophication characteristics of the Dongshan Bay, South China

Cited by 21 publications

References 18 publications

Recent advances and future research in ecological stoichiometry

Recent advances and future research in ecological stoichiometry

Anthropogenic global shifts in biospheric N and P concentrations and ratios and their impacts on biodiversity, ecosystem productivity, food security, and human health

Enhanced Regional Variability of Seawater pCO2 Under Human and Natural Interference in a Nearshore Coral Nature Reserve (Dongshan Island, China)

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Enhanced Regional Variability of Seawater pCO₂ Under Human and Natural Interference in a Nearshore Coral Nature Reserve (Dongshan Island, China)