Chemical characteristics of soils and pore waters of three wetland sites dominated by Phragmites australis: relation to vegetation composition and reed performance

Čı́žková, Hana; Pechar, Libor; Husák, Štěpán; Květ, Jan; Bauer, Václav; Radová, Jana; Edwards, Keith R.

doi:10.1016/s0304-3770(01)00141-3

Cited by 30 publications

(6 citation statements)

References 18 publications

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“…Total P retention was slightly positive on an annual basis due to rapid sedimentation of suspended solids and inorganic particulate P. Decomposition of the detritus, together with the lack of aquatic photosynthesis turned the water anoxic. End products of anaerobic metabolism and increased water depth caused a large-scale die-back of reed in the upstream areas of the Ingói Reeds [14]. To address these problems, the original design of the Kis-Balaton was revised in 1996.…”

Section: The Doom and Adventurous Rebirth Of The Kis-balaton Wetlandsmentioning

confidence: 99%

Lessons Learnt from the Long-Term Management of a Large (Re)constructed Wetland, the Kis-Balaton Protection System (Hungary)

Honti

Gao

Istvánovics

et al. 2020

Water

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Environmental management decisions should be made based on solid scientific evidence that relies on monitoring and modeling. In practice, changing economic, societal, and political boundary conditions often interfere with management during large, long, and complex projects. The result may be a sub-optimal development path that may finally diverge from the original intentions and be economically or technically ineffective. Nevertheless, unforeseen benefits may be created in the end. The Kis-Balaton wetland system is a typical illustration of such a case. Despite tremendous investments and huge efforts put in monitoring and modeling, the sequence of decisions during implementation can hardly be considered optimal. We use a catchment model and a basic water quality model to coherently review the impacts of management decisions during the 30-year history. Due to the complexity of the system, science mostly excelled in finding explanations for observed changes after the event instead of predicting the impacts of management measures a priori. In parallel, the political setting and sectoral authorities experienced rearrangements during system implementation. Despite being expensive as a water quality management investment originally targeting nutrient removal, the Kis-Balaton wetland system created a huge ecological asset, and thereby became worth the price.

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Section: The Doom and Adventurous Rebirth Of The Kis-balaton Wetlandsmentioning

confidence: 99%

Lessons Learnt from the Long-Term Management of a Large (Re)constructed Wetland, the Kis-Balaton Protection System (Hungary)

Honti

Gao

Istvánovics

et al. 2020

Water

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“…The reducing conditions and decay of the substrate organic matter initiated and sustained by the chronic influx of river water may become self-reinforcing and contribute to further declines in marsh vigor and organic matter quality (Cizkova et al 2001;Santruckova et al 2001). Dissolved iron, a possible buffer in this cycle because it can bind with sulfide and phosphate (Smolders and Roelofs 1995;van der Welle et al 2006), is in short supply in PB marsh porewater, presumably because it is used up in the biogeochemical reactions catalyzed by river influx.…”

Section: Above-ground Plant Biomass and Substratementioning

confidence: 99%

Biogeochemical response of organic-rich freshwater marshes in the Louisiana delta plain to chronic river water influx

Swarzenski¹,

Doyle²,

Fry

et al. 2008

Biogeochemistry

105

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To help evaluate effects of Mississippi River inputs to sustainability of coastal Louisiana ecosystems, we compared porewater and substrate quality of organic-rich Panicum hemitomon freshwater marshes inundated by river water annually for more than 30 years (Penchant basin, PB) or not during the same time (Barataria basin, BB). In the marshes receiving river water the soil environment was more reduced, the organic substrate was more decomposed and accumulated more sulfur. The porewater dissolved ammonium and orthophosphate concentrations were an order of magnitude higher and sulfide and alkalinity concentrations were more than twice as high in PB compared with BB marshes. The pH was higher and dissolved iron concentrations were more than an order of magnitude lower in PB marshes than in BB marshes. The influx of nutrientrich river water did not enhance end-of-year aboveground standing biomass or vertical accretion rates of the shallow substrate. The differences in porewater chemistry and substrate quality are reasonably linked to the long-term influx of river water through biogeochemical processes and transformations involving alkalinity, nitrate and sulfate. The key factor is the continual replenishment of alkalinity, nitrate and sulfate via overland flow during high river stage each year for several weeks to more than 6 months. This leads to a reducing soil environment, pooling of the phytotoxin sulfide and inorganic nutrients in porewater, and internally generated alkalinity. Organic matter decomposition is enhanced under these conditions and root mats degraded. The more decomposed root mat makes these marshes more susceptible to erosion during infrequent highenergy events (for example hurricanes) and regular low-energy events, such as tides and the passage of weather fronts. Our findings were unexpected and, if generally applicable, suggest that river diversions may not be the beneficial mitigating agent of wetland restoration and conservation that they are anticipated to be.

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“…As there was no inflow through either underground or surface water, the underlying mechanism is unknown. TN and TP values were relatively smaller than previous study sites (Nayar et al 2006;Suomela 2005;Č ížková 2001). No significant difference was recognized for pore water sampled by several ways as well as elements affecting the phosphorus and nitrogen analyses were sufficiently less (Fe ranging between 191 mg/kg and 989 mg/kg), these values are reliable.…”

Section: Ramet Density Gradientmentioning

confidence: 52%

Internal heterogeneity of ramet and flower densities of Typha angustifolia near the boundary of the stand

Asaeda

Hung

2007

Wetlands Ecol Manage

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Fifteen relatively narrow stands of Typha angustifolia, including both stands bounded to open water and ridged boundary, were investigated in terms of the distributions of ramet density as well as the fraction of flowering ramets. The ramet density, fraction of flowering ramet and morphological characteristics of ramets were measured continuously from one side of the stand to the other, together with depth and the nutrient concentration of pore water. The rhizome biomass was also measured at the periphery and at the center of the stand. The results indicated that the shoot density declined gradually from the edge to the center, however, the fraction of the flowering ramets were significantly higher at the edge while it rapidly declined away from the edge. Statistical analyses indicate that the ramet density depends on either depth or nutrient level of the pore water; however, the distance from the edge was the most probable factor to reduce the fraction of the flowering ramets. The rhizome biomass was mostly larger at the periphery than at the center, likely because the accumulation of the horizontal rhizomes as extension was blocked by the boundary. High flowering fraction near the periphery was probably induced by the hormonal change caused by the blockage. However, a large fraction of ramets flowered simultaneously with large rhizome biomass at the periphery, likely because of the preferable light climates compared with inside the stand.

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Chemical characteristics of soils and pore waters of three wetland sites dominated by Phragmites australis: relation to vegetation composition and reed performance

Cited by 30 publications

References 18 publications

Lessons Learnt from the Long-Term Management of a Large (Re)constructed Wetland, the Kis-Balaton Protection System (Hungary)

Lessons Learnt from the Long-Term Management of a Large (Re)constructed Wetland, the Kis-Balaton Protection System (Hungary)

Biogeochemical response of organic-rich freshwater marshes in the Louisiana delta plain to chronic river water influx

Internal heterogeneity of ramet and flower densities of Typha angustifolia near the boundary of the stand

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