Radial Oxygen Loss in Wetland Plants: Potential Impacts on Remediation of Contaminated Sediments

Smith, K. E.; Luna, Tamara O.

doi:10.1061/(asce)ee.1943-7870.0000631

Cited by 9 publications

(10 citation statements)

References 23 publications

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“…The plant species effect on microbial community structure in rhizospheres is due to differences in root ROL and root architecture [10,35,37]. While V. spiralis expected a higher amount of total PLFAs, total bacterial, gram-positive bacterial, and actinomycetes, PLFAs because V. spiralis presented a higher root biomass and ROL (Table 1) than H. verticillata.…”

Section: Discussionmentioning

confidence: 99%

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Root Radial Oxygen Loss and the Effects on Rhizosphere Microarea of Two Submerged Plants

Tian¹,

Wang²,

Tian³

et al. 2015

Pol. J. Environ. Stud.

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Radial oxygen loss (ROL) has been suggested to be a major process to protect plants exposed to the anaerobic by-products of soil anaerobiosis. The aim of the present study was to test the effects of root ROL from two submerged plants (Hydrilla verticillata and Vallisneria spiralis) on the rhizosphere oxygen profile and rhizosphere microarea. Phospholipid fatty acids (PLFAs) of sediment samples were used to characterize and quantify the microbial community. The results showed clearly that there were significant differences between the two plants in radial oxygen loss, which affected rhizosphere physicochemical parameters and the microbial community. Rhizosphere total biomass, bacteria, gram-positive bacteria, actinomycetes, and microbial diversity of V. spiralis were significantly higher than those of H. verticillata. The present study highlights root ROL as a key parameter affecting the microbial community of the rhizosphere microarea.

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Section: Discussionmentioning

confidence: 99%

“…24, No. 4 (2015), [1795][1796][1797][1798][1799][1800][1801][1802] matter, mineralizing nutrients [8,9] and protecting from phytotoxins such as S 2 and Fe 2+ [7,10,11]. So the study of microbial communities associated with plant ROL is important for understanding their ecological role in natural environments [12].…”

Section: Introductionmentioning

confidence: 99%

Root Radial Oxygen Loss and the Effects on Rhizosphere Microarea of Two Submerged Plants

Tian¹,

Wang²,

Tian³

et al. 2015

Pol. J. Environ. Stud.

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“…and Scirpus fluviatilis (Torr.) Soják, members of the same genus as S. acutus (Smith & Luna, 2012). Although gas transfer from soil to roots is distinct from ROL, root structural characteristics that enhance ROL (e.g., high aerenchyma porosity and permeability of the root epidermis) are expected to have similar effects on soil–root gas transfer (Armstrong, 1980; Beckett et al., 2001).…”

Section: Discussionmentioning

confidence: 99%

Kinetics of nitrous oxide mass transfer from porewater into root aerenchyma of wetland plants

Wang

Reid

2020

J of Env Quality

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The creation and/or restoration of wetlands is an important strategy for controlling the release of reactive nitrogen (N) via denitrification, but there can be tradeoffs between enhanced denitrification and the production of nitrous oxide (N 2 O), a potent greenhouse gas. A knowledge gap in current understanding of belowground wetland N dynamics is the role of gas transfer through the root aerenchyma system of wetland plants as a shortcut emission pathway for N 2 O in denitrifying wetland soils. This investigation evaluates the significance of mass transfer into gas-filled root aerenchyma for the N 2 O budget in wetland mesocosms planted with Sagittaria latifolia Willd. and Schoenoplectus acutus (Muhl. ex Bigelow) Á. Löve & D. Löve. Dissolved gas tracer push-pull tests with N 2 O and the nonreactive gas tracers helium, sulfur hexafluoride, and ethane were used to estimate first-order rate constants for gas transfer into roots and microbial N 2 O reduction and thereby disentangle the effects of root-mediated gas transport from microbial metabolism on N 2 O balances in saturated soils. Root-mediated gas transport was estimated to account for up to 37% of overall N 2 O removal from the wetland soils. Rates of microbial N 2 O reduction varied widely based on the organic matter content of the soil media and served as a key control on the fraction of N 2 O that transferred into roots. This research identifies transport through root aerenchyma as a potential shortcut pathway for N 2 O emission from wetland soils and sediments and indicates that this process should be considered in both measurements and mechanistic modeling of belowground wetland N dynamics.

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“…A recent paper by Smith and Luna (2011) suggests that aerobic degradation of organic contaminants may be facilitated in wetland soils through selection of plants with high rates of oxygen loss into the rhizosphere (radial oxygen loss). The results of this study were used to select plants for a subsequent study evaluating the degradation of PAHs in saturated sediments.…”

Section: Chemical/geo-chemical Processesmentioning

confidence: 99%

“…Plants also secrete compounds stimulating further microbial growth, such as amino acids, sugars, and organic acids. Plant species employed in the study (Smith and Luna 2011) The root zone area oxygenated by each species was estimated by one of three methods:…”

Section: Chemical/geo-chemical Processesmentioning

confidence: 99%

Economical Treatment of Dredged Material to Facilitate Beneficial Use

Estes¹,

McGrath²

2014

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Growing constraints on conventional dredged material disposal are motivating movement toward more sustainable alternatives. Given the lack of universal beneficial use criteria, even the low levels of contaminants typically found in navigation channel sediments may limit or preclude their beneficial use. Intensive treatment to remove or destroy contaminants in such sediments is typically too costly to be a viable alternative within the context of navigation dredging; economical, lowtech sediment and water treatment processes are needed. Recent developments in the area of sediment treatment were assessed through an extensive literature search, and promising technologies were identified. Potentially high value research areas were also identified, to inform subsequent bench and pilot testing. Geochemical contaminant controls and modeling, passive water treatment methods for colloid and ammonia removal, H2S controls, in-CDF biodegradation, aerobic/anaerobic composting, phase-specific physical separation, low temperature thermal treatment, reactive geobags, and coupled geochemical/stabilization process modeling were areas identified as deserving of additional research investment. DISCLAIMER: The contents of this report are not to be used for advertising, publication, or promotional purposes. Citation of trade names does not constitute an official endorsement or approval of the use of such commercial products. All product names and trademarks cited are the property of their respective owners. The findings of this report are not to be construed as an official Department of the Army position unless so designated by other authorized documents.

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Radial Oxygen Loss in Wetland Plants: Potential Impacts on Remediation of Contaminated Sediments

Cited by 9 publications

References 23 publications

Root Radial Oxygen Loss and the Effects on Rhizosphere Microarea of Two Submerged Plants

Root Radial Oxygen Loss and the Effects on Rhizosphere Microarea of Two Submerged Plants

Kinetics of nitrous oxide mass transfer from porewater into root aerenchyma of wetland plants

Economical Treatment of Dredged Material to Facilitate Beneficial Use

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