Relationship between water regime and hummock-building by Melaleuca ericifolia and Phragmites australis in a brackish wetland

Wallis, Elizabeth; Raulings, Elisa

doi:10.1016/j.aquabot.2011.05.006

Cited by 30 publications

(33 citation statements)

References 39 publications

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“…Similar findings have been reported in other studies (Kelley & Jack 2002;Wallis & Raulings, 2011). The decomposition of the plant litter is faster in water due to the leaching of minerals and the increased fragmentation due to the wetting of the plant material (Langhans & Tockner, 2006), except when conditions become anoxic (Webster & Benfield, 1986).…”

Section: Decomposition Ratesupporting

confidence: 86%

Water-level fluctuations as a driver of Phragmites australis primary productivity, litter decomposition, and fungal root colonisation in an intermittent wetland

et al. 2015

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The hypothesis of this study is that the variable hydrological regime of intermittent lakes and wetlands affects the primary productivity, decomposition and root fungal colonisation of Phragmites australis, with effects on the whole ecosystem metabolism. The above-ground biomass of reed stands was monitored in littoral and riparian stands of Lake Cerknica, under different water levels. Leaf and culm litter decomposition was also studied at three locations, from predominantly dry to permanently submerged. Root colonisation by fungi was monitored across two seasons in the littoral reed stand. The primary productivity of the littoral stands was related to a variable degree with water levels and air temperature in July in the current year. In the riparian reeds, only monthly temperatures in October of the previous year were important. The submersion duration of the litter enhanced the decomposition rates. The frequency of fungal colonisation of reed roots was decreasing with the submersion time length. Overall, roots were colonised by arbuscules, hyphae, vesicles, hyphal coils and microsclerotia. The main outcomes of this study deals with the role of intermittent hydrological conditions in determining the structure and functioning of reed-dominated lacustrine wetlands, which are exposed to climate threats.

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Section: Decomposition Ratesupporting

confidence: 86%

Water-level fluctuations as a driver of Phragmites australis primary productivity, litter decomposition, and fungal root colonisation in an intermittent wetland

et al. 2015

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“…The decomposition rates of both leaf litters were slowest at 0 cm, suggesting a stimulation effect by submergence in liable litters. Inhabitation or promotion by water depth have also been reported in other studies (Wallis and Raulings, 2011;Sun et al, 2012). Besides by increasing leaching and physical fragmentation resulting from submergence itself (Torremorell and Gantes, 2010; Wallis and Raulings, 2011), water depth variation might also affected litter decomposition through the decomposer.…”

Section: Water Depth and Leaf Litter Decompositionmentioning

confidence: 83%

“…Both leaf litters released C, N, P and lignin during litter incubation, indicating that nutrient demands of fungus is satisfied by litter decomposition (Xie et al, 2004). However, fungal biomass of both leaf litters was higher at 5 cm and 80 cm than at 0 cm water depths, which might be resulted from an adaptive response of fungal growth and reproduction to adequate moisture by submergence (Wallis and Raulings, 2011;Sun et al, 2012;). The faster release of nutrients, lignin and cellulose as a response to submergence also reflected that fungus utilized litter more efficiently (Fonseca et al, 2013).…”

Section: Water Depth and Leaf Litter Decompositionmentioning

confidence: 84%

“…Water depth often results in variation of physicochemical conditions, which in turn regulates the decomposition processes of macrophyte litter (Laiho, 2006). In shallow water environments, litter decomposition is rapid due to a faster rate of leaching of dissolved organic matter and increased activities of microbes (Wallis and Raulings, 2011). In deep water ecosystems, both temperature and dissolved oxygen content are usually low limiting litter decomposition as an effect of reduced microbial activity (Torremorell and Gantes, 2010;Fonseca et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

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Interaction between litter quality and simulated water depth on decomposition of two emergent macrophytes

Xie

et al. 2015

J Limnol

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“…Microtopography is a key component of wetland ecology, influencing a host of fundamental wetland processes. This results from the primacy of shallow water table and soil saturation dynamics in driving wetland dynamics (Rodriguez-Iturbe et al 2007); any variability in soil elevation therefore represents coincident variability in this control (Wallis and Raulings 2011).…”

Section: Introductionmentioning

confidence: 99%

Microtopography is a fundamental organizing structure in black ash wetlands

Diamond¹,

McLaughlin

Slesak

et al. 2019

Preprint

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<p><strong>Abstract.</strong> All wetland ecosystems are controlled by water table and soil saturation dynamics, so any local scale deviation in soil elevation represents variability in this primary control. Wetland microtopography is the structured variability in soil elevation, and is typically categorized into a binary classification of local high points (<q>hummocks</q>) and local low points (<q>hollows</q>). Although the influence of microtopography on vegetation composition and biogeochemical processes has received attention in wetlands around the globe, its role in forested wetlands is still poorly understood. We studied relationships among microtopography on understory vegetation communities, tree biomass, and soil chemistry in 10 black ash (Fraxinus nigra Marshall) wetlands in northern Minnesota, U.S.A. To do so, we combined a 1-cm resolution surface elevation model generated from terrestrial laser scanning (TLS) with co-located water table, vegetation, and soil measurements. We observed that microtopography was an important structural element across sites, where hummocks were loci of greater species richness, greater midstory and canopy basal area, and higher soil concentrations of chloride, phosphorus, and base cations. In contrast, hollows were associated with higher soil nitrate and sulfate concentrations. We also found that the effect of microtopography on vegetation and soils was greater at wetter sites than at drier sites, suggesting that distance to mean water table is a primary determinant of wetland biogeochemistry. These findings highlight clear controls of mictopography on vegetation and soil distributions, while also supporting the notion that microtopography arises from feedbacks that concentrate biomass, soil nutrients, and productivity on microsite highs, especially in otherwise wet conditions. We therefore conclude that microtopography is a fundamental organizing structure in black ash wetlands.</p>

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Relationship between water regime and hummock-building by Melaleuca ericifolia and Phragmites australis in a brackish wetland

Cited by 30 publications

References 39 publications

Water-level fluctuations as a driver of Phragmites australis primary productivity, litter decomposition, and fungal root colonisation in an intermittent wetland

Water-level fluctuations as a driver of Phragmites australis primary productivity, litter decomposition, and fungal root colonisation in an intermittent wetland

Interaction between litter quality and simulated water depth on decomposition of two emergent macrophytes

Microtopography is a fundamental organizing structure in black ash wetlands

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