Changes in Al and Fe crystallinity and P sorption capacity in a flood-plain forest soil subjected to artificially manipulated flooding regimes in field mesocosms

Darke, Arlene K.; Walbridge, Mark R.; Lockaby, B. Graeme

doi:10.1007/bf02150537

Cited by 15 publications

(6 citation statements)

References 24 publications

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“…In contrast, de Vicente et al (2010) found an apparently non-reversible decrease of amorphous Fe oxides during oxic rewetting of dried lake sediment (no change of Al Ox ) resulting in a reduced P sorption capacity and an increased P release. The reversibility of the occurred crystallization of Al Ox (in our experiment) is in agreement with decreases in crystallinity of Al and Fe in floodplain forest soils (Darke et al, 1997;Darke & Walbridge, 2000) and is important for the evaluation of the sustainable effect of drying on sediment properties (Baldwin, 1996).…”

Section: Simulation Of Drying and Rewetting With Intact Sediment Coressupporting

confidence: 73%

“…The effect of rewetting on the degree of crystallinity of Fe and aluminum (Al) forms is very contradictory described in the literature. Both a decrease (Sah et al, 1989;Darke et al, 1997;Darke & Walbridge, 2000) as well as an, apparently non-reversible, increase [of Fe oxides (de Vicente et al, 2010)] were observed and resulted in the latter case in a reduced P sorption capacity and an increased P release.…”

Section: Introductionmentioning

confidence: 89%

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Simulated drawdown and rewetting of littoral sediments: implications for Lobelia lake management

et al. 2015

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This study aims to answer the question if temporary drawdowns could be a beneficial restoration measure for endangered Lobelia lakes. Intact littoral sediment cores with and without plants were used to simulate a drawdown over an almost 5 months period and a subsequent rewetting. During drawdown, the initial low saturation of sorption sites for phosphorus (P) increased due to increased contents of mobile P forms in the surface layers. Contents of P binding iron forms remained constant. The increase of mobile P forms was mostly derived from decayed plant material since the experimental set up caused dying of plants. Upon rewetting effluxes of total dissolved phosphorus and dissolved organic carbon were observed which are most likely attributable to the degraded plant material. A phosphorus uptake experiment with dried and rewetted sediment cores without plants showed that the initial high P binding capacity had been retained during drying and rewetting. These findings were confirmed by a small scale long-term drying (348 days) and rewetting (228 days) experiment which overall did not show a significant reduction in P adsorption capacity. Therefore, drawdowns can be an appropriate restoration measure for endangered Lobelia lakes given that the isoetid plants spread during the drying period.

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Section: Simulation Of Drying and Rewetting With Intact Sediment Coressupporting

confidence: 73%

Section: Introductionmentioning

confidence: 89%

Simulated drawdown and rewetting of littoral sediments: implications for Lobelia lake management

et al. 2015

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“…In general, the variations in transformations of phosphorus among different landscape characteristics (such as geology) are not as well studied as abundance and transport. Individual studies have described phosphorus transformations in different watersheds with distinct mineralogies [e.g., Darke et al, 1996;Litaor et al, 2003;Lapworth et al, 2011]; evaluated the correlation of phosphorus with abundance of phosphorus binding compounds or other soil characteristics [e.g., Vanek, 1993;Evans et al, 2000;Prior and Johnes, 2002]; or (in a few cases) proposed conceptual models of the effects of redox level gradients on phosphorus release, or of landscape-scale hydrologic characteristics on the development of redox conditions or an index-based susceptibility to phosphorus loss [e.g., Hill, 2000;Reid et al, 2012].…”

Section: Transformationmentioning

confidence: 99%

“…Environmental phosphorus models may not include dynamics that have proven to be important controls of river corridor phosphorus in field studies (e.g., only some models simulate different sorption rates for calcareous and non-calcareous soils, although lab studies show there is marked difference between the two) [Darke et al, 1996;McGechan and Lewis, 2002;Havlin et al, 2005;Robson, 2014].…”

Section: Introductionmentioning

confidence: 99%

Phosphorus in the river corridor

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Wohl

Arabi

2016

Earth-Science Reviews

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River corridor protection has been adopted by government agencies and non-governmental organizations to try to control nonpoint nutrient loading to rivers. Yet, river corridor protection and modeling strategies developed on a national basis may not fully account for dynamics that have proven to be important controls on phosphorus in river corridors. These sources of uncertainty may have economic and environmental costs, yet we know of no previous works that have proposed a broad conceptual model of phosphorus dynamics in river corridors. In this review, we develop a conceptual model of phosphorus in the river corridor under natural conditions based on existing research by: (i) evaluating how processes and controls vary among distinct landscape characteristics and among distinct segments within river networks (e.g., in confined channels versus wide valleys); and (ii) determining whether some processes and controls are generally more dominant for some landscape types and river reaches. Finally, we provide an example application of the conceptual model, and identify key areas for future research. The review suggests that phosphorus dynamics in the river corridor, and their controls, may vary substantially across different landscape types and river reaches. However, the conceptual model outlined here illustrates how certain characteristics of landscape type, and abundance, transport, and transformation of phosphorus and reactive compounds, may help to predict important river corridor phosphorus dynamics. Use of this conceptual model can better inform numerical modeling of phosphorus dynamics and management of river corridors.

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“…While the main channel and deeper parts of floodplain backwaters remain permanently inundated, riparian zones and shallow areas are periodically falling dry and get re-wetted depending on their topography and the surface flow paths. Water level fluctuations and desiccation are expected to have a strong effect on internal phosphorus loading by altering redox conditions of sediments, pH, physical properties of minerals ( Aldous et al, 2005; Baldwin, 1996; Baldwin and Mitchell, 2000; Darke et al, 1996; Lijklema, 1980; Sah et al, 1989 ) and the composition and activity of the microbial community ( Batzer and Sharitz, 2006 ).…”

Section: Introductionmentioning

confidence: 99%

Impact of drying and re-flooding of sediment on phosphorus dynamics of river-floodplain systems

Schönbrunner

Preiner

Hein

2012

Science of The Total Environment

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One of the consequences of human impacts on floodplains is a change in sedimentation leading to enhanced floodplain aggradation. Thus, accumulated sediments rich in nutrients might interfere with floodplain restoration. In this study we investigated the phosphorus release behavior of sediments from shallow backwaters of an isolated floodplain of the Danube River situated east of the city of Vienna with the aim to understand the effects of changes in dry/wet cycles on established floodplain sediments. In the light of restoration plans aiming at increased surface water exchange with the river main channel, the response of sediments to frequent alternations between desiccation and inundation periods is a key issue as changes of sediment properties are expected to affect phosphorus release. In order to determine the effect of changing hydrological conditions on internal phosphorus loading, we exposed sediments to different dry/wet treatments in a laboratory experiment. Total phosphorus (TP) release from sediments into the water column increased with increasing duration of dry periods prior to re-wetting. Partial correlation analysis showed significant positive correlations between ΔTP and ΔNH 4 + as well as between ΔTP and ΔFe 3 + concentrations (Δ refers to the difference between the final and initial concentration during the wetting period), indicating that enhanced mineralization rates leading to a concomitant release of NH 4 + and TP and the reduction of iron hydroxides leading to a concomitant release of Fe 3 + and TP are the mechanisms responsible for the rise in TP. Repeated drying and wetting resulted in elevated phosphorus release. This effect was more pronounced when drying periods led to an 80% reduction in water content, indicating that the degree of drying is a major determinant controlling phosphorus release upon re-wetting. The reconnection of isolated floodplains will favor fluctuating hydrologic conditions and is therefore expected to initially lead to high rates of phosphorus release from sediments.

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Changes in Al and Fe crystallinity and P sorption capacity in a flood-plain forest soil subjected to artificially manipulated flooding regimes in field mesocosms

Cited by 15 publications

References 24 publications

Simulated drawdown and rewetting of littoral sediments: implications for Lobelia lake management

Simulated drawdown and rewetting of littoral sediments: implications for Lobelia lake management

Phosphorus in the river corridor

Impact of drying and re-flooding of sediment on phosphorus dynamics of river-floodplain systems

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