Predicting Metal Release from Peatlands in Sudbury, Ontario, in Response to Drought

Watmough, Shaun A.; Orlovskaya, L. V.

doi:10.1007/s11270-015-2372-z

Cited by 9 publications

(7 citation statements)

References 33 publications

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“…Although we chose Ni and Cu as representative contaminants, the toxic effect of these disrupted linkages would actually be the product of many interactive and correlated contaminants. For example, Watmough & Orlovskaya () found Co, Mn and Zn to be released along with Ni from peatland soils in response to drying, and all of these metals are chronically toxic to H. azteca and other aquatic organisms (Borgmann et al ., ; Norwood et al ., ). Although the lability of Cu remained low because of its high affinity with DOC and organic soils (Santore et al ., ; Novak et al ., ), there are several other metals that are regulated by organic matter to varying degrees and some are toxic at low concentrations [e.g.…”

Section: Discussionmentioning

confidence: 99%

“…We focussed on two representative metal contaminants: Cu, whose speciation is controlled largely by organometal complexation, and Ni, regulated primarily by pH (Watmough & Orlovskaya, ). We installed diffuse gradients in thin films (DGTs; Davison & Zhang, ) in all sites for 2 weeks to estimate DGT‐labile fractions of these contaminants, which are free ions and those forms that quickly dissociate from organic molecules.…”

Section: Methodsmentioning

confidence: 99%

“…Summer droughts are increasing in intensity, duration and frequency (Trenberth, ), causing low‐flow conditions that effectively disconnect upland soils from their receiving waters and ultimately reduce concentrations and fluxes of tOM from forests and wetlands (Schiff et al ., ; Clark et al ., ; Sowerby et al ., ). Organic soils that are oxidized when dry generate acids that further suppress tOM by reducing organic carbon solubility, and release metals into pore water and stream flow during rain events (Evans et al ., ; Pennington & Watmough, ; Watmough & Orlovskaya, ). The release of metal contaminants is exacerbated by low‐flow conditions that provide little dilution.…”

Section: Introductionmentioning

confidence: 99%

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Dry conditions disrupt terrestrial–aquatic linkages in northern catchments

Emilson

Kielstra

Arnott

et al. 2016

Global Change Biology

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Aquatic ecosystems depend on terrestrial organic matter (tOM) to regulate many functions, such as food web production and water quality, but an increasing frequency and intensity of drought across northern ecosystems is threatening to disrupt this important connection. Dry conditions reduce tOM export and can also oxidize wetland soils and release stored contaminants into stream flow after rainfall. Here, we test whether these disruptions to terrestrialaquatic linkages occur during mild summer drought and whether this affects biota across 43 littoral zone sites in 11 lakes. We use copper (Cu) and nickel (Ni) as representative contaminants, and measure abundances of Hyalella azteca, a widespread indicator of ecosystem condition and food web production. We found that tOM concentrations were reduced but correlations with organic soils (wetlands and riparian forests) persisted during mild drought and were sufficient to suppress labile Cu concentrations. Wetlands, however, also became a source of labile Ni to littoral zones, which was linked to reduced abundances of the amphipod H. azteca, on average by up to 70 times across the range of observed Ni concentrations. This reveals a duality in the functional linkage of organic soils to aquatic ecosystems whereby they can help buffer the effects of hydrologic disconnection between catchments and lakes but at the cost of biogeochemical changes that release stored contaminants. As evidence of the toxicity of trace contaminant concentrations and their global dispersion grows, sustaining links among forests, organic soils and aquatic ecosystems in a changing climate will become increasingly important.

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Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Dry conditions disrupt terrestrial–aquatic linkages in northern catchments

Emilson

Kielstra

Arnott

et al. 2016

Global Change Biology

Self Cite

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“…An increase in Cu concentration (Pb was below detection in pore water) did not occur most likely because although protons will displace Cu 2+ bound to organic matter, the decrease in DOC measured in August will result in a decrease in Cu-bound to organic matter that largely offsets the increase in Cu 2+ . Watmough and Orlovskaya (2015) recently showed that during simulated drought experiments, the pH of pore water in Sudbury peatlands decreased and there was a predictable increase in the free ion concentrations (estimated with WHAM) of several metals including Cu, Ni and Co. At the same time, post-drought DOC levels decreased, lowering the concentration of metals that have strong affinities for organic matter (Al and Cu in this case) resulting in no net increase in total Cu or Al in response to drought. This lack of mobility likely explains why Cu and Pb deposition histories appear to be better preserved in peat.…”

Section: Discussionmentioning

confidence: 99%

The impact of drought and air pollution on metal profiles in peat cores

Souter

Watmough

2016

Science of The Total Environment

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“…The compost as an organic matter plays an important role in managing the solubility of some metals. The more organic matter dissolved in soils, the less amount of soluble Al in plants because the dissolved organic matter (DOM) will buffer the free state of Al and Fe with DOM-metal bound (Stirling et al, 2020;Watmough & Orlovskaya, 2015). Zanin et al (2019) further stated that organic matters are referred to as redox reactive, which can reduce metal ionic compounds, including Fe 3+ .…”

Section: The Dynamics Of Soluble Al and Fementioning

confidence: 99%

Essential Dynamics of Rice Cultivated under Intensification on Acid Sulfate Soils Ameliorated with Composted Oyster Mushroom Baglog Waste

Jumar¹,

Saputra²,

Nugraha³

et al. 2022

JTAS

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This study examines the dynamics of essential macro-nutrients for rice cultivation in acid sulfate soils ameliorated with composted oyster mushroom baglog waste. A single factor randomized block design (RBD) was used, and the factors studied include the compost dose of oyster mushroom baglog waste, which consists of 5 treatment levels, namely 0 t ha-1 (control), 5 t ha-1, 10 t ha-1, 15 t ha-1, and 20 t ha-1. Furthermore, this study was carried out from May to September 2021 in the rice fields of the Faculty of Agriculture, Lambung Mangkurat University (ULM), Sungai Rangas Village, Banjar Regency, South Kalimantan. The rice plants were cultivated using an intensification technique, and the compost was applied based on the research treatment for two weeks on prepared land before planting. Also, Bartlett’s test was carried out before analysis of variance, which had a significant effect of P<0.05, and was further tested using Duncan’s Multiple Range Test (DMRT) at a 5% level. The results showed variations in the availability of macro-nutrients at five different growth stages: early planting, full vegetative, early panicle emergence, panicle filling, and harvesting phases. The highest levels of ammonium (NH4+) and nitrate (NH3-) were found in the full vegetative stage, while early planting had the lowest. Also, there was an increase in the available phosphorus (P) from the early planting to the full vegetative stage. The increase in exchangeable potassium (K) occurred at the transition of these stages. These increasing nutrients were due to the addition of the compost. The higher the NH4+, NO3-, available P, and exchangeable K in acid sulfate soils, the more nitrogen (N), P, and K uptake in rice plants. The provision of the compost supplied N, P, and K in available forms and reduced the amount of soluble alumunium (Al) and iron (Fe). Thereby the plant roots absorb the nutrients optimally. Additionally, the compost increased the essential macro-nutrient availability and plant uptake using the rice intensification technique from early planting to harvest.

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Predicting Metal Release from Peatlands in Sudbury, Ontario, in Response to Drought

Cited by 9 publications

References 33 publications

Dry conditions disrupt terrestrial–aquatic linkages in northern catchments

Dry conditions disrupt terrestrial–aquatic linkages in northern catchments

The impact of drought and air pollution on metal profiles in peat cores

Essential Dynamics of Rice Cultivated under Intensification on Acid Sulfate Soils Ameliorated with Composted Oyster Mushroom Baglog Waste

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