Throughflow as a determining factor for habitat contiguity in a near-natural fen

Loon, A.H. van; Schot, P.P.; Griffioen, Jasper; Bierkens, Marc F. P.; Batelaan, Okke; Wassen, Martin J.

doi:10.1016/j.jhydrol.2009.09.041

Cited by 33 publications

(27 citation statements)

References 41 publications

(55 reference statements)

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“…As Fe 3+ is one of the main binding elements for phosphate, this leads to enhanced availability of phosphate ions for plants (Mitsch and Gosselink 1993;van Loon et al 2009). At the same time, ammonification provokes an increase of NH 4 + which can reach the surface by upward diffusion, due to concentration gradients between reduced and oxidized layers.…”

Section: +mentioning

confidence: 99%

“…These patterns are influenced by the aquifer-scale processes constraining groundwater chemistry (in particular initial Eh, pH and ionic contents) prior to peat seepage. The localization of groundwater discharges may also modify the aforementioned abiotic patterns (van Loon et al 2009) and the uses by adapted plants (Malmer et al 2003). Peatland forms (in depressions, on slopes) may favor or reduce groundwater circulation (Novitzki 1979;Mitsch and Gosselink 1993;Brinson 1993;National Wetland Working Group 1997) or modify the balance between precipitation and groundwater.…”

Section: +mentioning

confidence: 99%

“…Cowardin et al (1979) focused on salinity regimes, water permanency, pH, and soil material. Brinson (1993), Euliss et al (2004) and Davies and Anderson (2001) highlighted that the geomorphic function and hydrogeological processes (Brinson 1993;Hajek et al 2006;Pellerin et al 2009;van Loon et al 2009) and to assess the effects of hydrochemical changes in ecosystems (Rhode et al 2004;Brewer and Menzel 2009). Previous ecological studies (Aeschimann et al 2004;Cantonati et al 2006;Hajek et al 2006;Delarze and Gonseth 2008) or databases (Corinne Biotope 1991) were used.…”

Section: Proposed Classification Of Gdesmentioning

confidence: 99%

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Review: From multi-scale conceptualization to a classification system for inland groundwater-dependent ecosystems

et al. 2011

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Aquifers provide water, nutrients and energy with various patterns for many aquatic and terrestrial ecosystems. Groundwater-dependent ecosystems (GDEs) are increasingly recognized for their ecological and socio-economic values. The current knowledge of the processes governing the ecohydrological functioning of inland GDEs is reviewed, in order to assess the key drivers constraining their viability. These processes occur both at the watershed and emergence scale. Recharge patterns, geomorphology, internal geometry and geochemistry of aquifers control water availability and nutritive status of groundwater. The interface structure between the groundwater system and the biocenoses may modify the groundwater features by physicochemical or biological processes, for which biocenoses need to adapt. Four major types of aquifer-GDE interface have been described: springs, surface waters, peatlands and terrestrial ecosystems. The ecological roles of groundwater are conditioned by morphological characteristics for spring GDEs, by the hyporheic zone structure for surface waters, by the organic soil structure and volume for peatland GDEs, and by water-table fluctuation and surface floods in terrestrial GDEs. Based on these considerations, an ecohydrological classification system for GDEs is proposed and applied to Central and Western-Central Europe, as a basis for modeling approaches for GDEs and as a tool for groundwater and landscape management.

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Section: +mentioning

confidence: 99%

Section: +mentioning

confidence: 99%

Section: Proposed Classification Of Gdesmentioning

confidence: 99%

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Review: From multi-scale conceptualization to a classification system for inland groundwater-dependent ecosystems

et al. 2011

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“…This zone commonly comprises only a few centimeters but may drop much deeper (during extended dry periods [82]. Percolating surface water reaching the water table is assumed to change to a lateral direction of flow [88].…”

Section: Contaminated Surface Water Infiltrates Into the Peat (Downwamentioning

confidence: 99%

“…Where horizontal layers of different hydraulic conductivity exists (e.g., layers of ash, clay, gravel, and bedrock), a preferential lateral water flow through these layers (‗throughflow' [88], ‗lateral seepage' [73]) is likely to occur. With limited contact of the U containing water to the highly sorptive peat matrix, this layer-bound type of throughflow would result in limited removal of U from the water phase.…”

Section: Lateral Water Flow Through the Peat (Through-flow)mentioning

confidence: 99%

Peatlands as Filters for Polluted Mine Water?—A Case Study from an Uranium-Contaminated Karst System in South Africa—Part II: Examples from Literature and a Conceptual Filter Model

Winde

2011

Water

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Abstract:As the second part of a series of four, this paper reviews a number of case studies of natural uranium attenuation in peat, as well as underlying chemical mechanisms reported in literature. Based on this review, a generic, conceptual, model for peat to act as filter for dissolved uranium (U) is developed for guiding subsequent field investigations. The model consists of a chemical and an hydraulic component which is derived largely from data reported in literature as well as from limited field observations. For the chemical model component 10 different processes, each controlled by factors relating to water chemistry, have been identified to govern the attenuation of U in peat via a net balance of immobilization and remobilization. For the hydraulic aspect of the filter model, five different principal modes of U polluted water coming in contact with peat are discussed, focusing on the associated peat-water contact time as a crucial parameter controlling chemical U attenuation. Moreover, links between the two model components are discussed and, based on the integrated conceptual model, possible effects of natural and anthropogenic events on U attenuation in peatlands are outlined. Guided by the model, various site-specific field and laboratory investigations are finally designed to verify how far the identified generic factors and processes are indeed applicable to the Gerhard Minnebron Peatland.

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Relationships between vegetation type, peat hydraulic conductivity, and water table dynamics in mountain fens

2015

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The ecohydrologic function of fens is characterized by feedbacks between biological and hydrologic processes. Vegetation composition is one important factor that is both responsive to the site hydrologic regime and, by providing the organic material that determines peat hydrophysical properties, influences hydrologic conditions. In this study, we investigated the relationship between vegetation type and peat soil hydraulic conductivity in fen wetlands within the Rocky Mountain National Park, Colorado. We used ponded infiltration tests to estimate the saturated hydraulic conductivity of near-surface peat in mountain fens with differing vegetation, including large-sedge fens dominated by Carex aquatilis and Carex utriculata, small-sedge fens dominated by Eleocharis quinqueflora, and fens with an abundance of woody plants and mosses. Estimated hydraulic conductivities were lowest at the fens dominated by E. quinqueflora, with a median value of 1·3 × 10 À3 cm s À1 compared with 1·3 × 10 À2 and 9·6 × 10 À3 cm s À1, respectively, at the large-sedge and woody fens. These data help explain historical water table observations at each fen. The E. quinqueflora-dominated fens in our study area maintain a high water table with saturated conditions throughout the summer growing season. Other fens with higher-conductivity peat show a more dynamic water table that is below ground surface by late summer.

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Throughflow as a determining factor for habitat contiguity in a near-natural fen

Cited by 33 publications

References 41 publications

Review: From multi-scale conceptualization to a classification system for inland groundwater-dependent ecosystems

Review: From multi-scale conceptualization to a classification system for inland groundwater-dependent ecosystems

Peatlands as Filters for Polluted Mine Water?—A Case Study from an Uranium-Contaminated Karst System in South Africa—Part II: Examples from Literature and a Conceptual Filter Model

Relationships between vegetation type, peat hydraulic conductivity, and water table dynamics in mountain fens

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