The effects of restored hydrologic connectivity on floodplain trapping vs. release of phosphorus, nitrogen, and sediment along the Pocomoke River, Maryland USA

Noe, Gregory B.; Boomer, Kathy; Gillespie, Jaimie L.; Hupp, Cliff R.; Martin-Alciati, Mario; Floro, Kelly; Schenk, Edward R.; Jacobs, Amy D.; Strano, S.

doi:10.1016/j.ecoleng.2019.08.002

Cited by 22 publications

(21 citation statements)

References 81 publications

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“…For the restoration scenario there would be a gradient expected, ranging from dynamic water bodies with high nutrient retention capacity dominated by rheotopic species to stagnant systems with no relevance for nutrient retention dominated by a stagnotopic community. This is in concordance with the findings that both ecosystem functions (Hein et al, 2003; Noe et al, 2019; Tockner et al, 1999) as well as biotic communities (e.g., Desjonquères et al, 2018; Leigh & Sheldon, 2009; Paillex et al, 2013; Reckendorfer et al, 2006) change along the hydrological gradient in floodplain systems. A large‐scale 10‐year experiment at the Olentangy River Wetland Research Park in Ohio, USA, demonstrated that restoration of hydrological dynamics decreased green‐house gas emissions, organic matter accumulation and increased nutrient retention as well as biodiversity (Mitsch et al, 2008), which is in line with the modelling results of the presented study.…”

Section: Discussionsupporting

confidence: 85%

Analysing the potential to restore the multi‐functionality of floodplain systems by considering ecosystem service quality, quantity and trade‐offs

Funk

Tschikof

Grüner

et al. 2020

River Research & Apps

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River floodplains are hotspots of productivity and biodiversity and recognized to fulfil vital ecosystem functions and services. Restoration measures of the decoupled Danube floodplains east of Vienna aim to re‐establish multi‐functionality, that is, ensure navigation, preserve and restore unique fluvial and riparian habitats and re‐establish natural processes and service provisioning. Side‐channels are proposed for reconnection combined with the removal of embankments and groins. We evaluated how a programme of measures influences the diversity and quantity of specific ecosystem services (ES) and therefore, the overall multi‐functionality of the floodplain compared to the current situation. Therefore, regulating ecosystem services (RES), such as nutrient retention and habitat provisioning, were modelled and predicted using multivariate regression models. Also, the potential of cultural ecosystem services (CES) was assessed based on mapping of recreational activities. The impact of proposed measures on ES quantity, that is, quantitative spatial representation, and quality, that is, biodiversity and nature experience, as well as potential synergies and trade‐offs were analysed. Our results show clear synergies especially for RES (habitat for the rheotopic community and nutrient retention) and the CES of nature experience. Those services have a weak and local trade‐off with the quantitative availability of opportunities for recreation. This pattern could only be detected by considering both, quantitative as well as qualitative aspects of ES. Overall, our results show that the restoration measures have a high potential to increase the multi‐functionality of the floodplain system by supporting the provisioning of RES including habitat for endangered species and selected CES.

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Section: Discussionsupporting

confidence: 85%

Analysing the potential to restore the multi‐functionality of floodplain systems by considering ecosystem service quality, quantity and trade‐offs

Funk

Tschikof

Grüner

et al. 2020

River Research & Apps

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“…our study). Diverse patterns of flooding–soil nutrient relationships could be attributed to multiple effects of flooding on soil nutrient cycling (Baldwin & Mitchell, 2000; Carmignani & Roy, 2017; Keizer et al., 2018; Noe et al., 2019). In our study area, flooding effects on soil nutrient availability were mixed.…”

Section: Discussionmentioning

confidence: 99%

“…Flooding duration could affect soil nutrient availability (Shrestha et al., 2014; Wright et al., 2015), which is important to wetland plants (Keddy, 2010), and thus indirectly affects wetland plant growth (Garssen et al., 2017). Flooding could affect the processes of sedimentation (Keizer et al., 2018; Noe et al., 2019), soil erosion (Carmignani & Roy, 2017), litter decomposition (Bai et al., 2005), and chemical reactions relating to nutrient leaching to water (Baldwin & Mitchell, 2000; Sollie et al., 2008). The overall effects of flooding on soil nutrient availability could be site‐dependent, because these processes varied among different study sites.…”

Section: Introductionmentioning

confidence: 99%

Effects of flooding duration on wetland plant biomass: The importance of soil nutrients and season

et al. 2020

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Extensive studies have shown that the relationship between flooding duration and wetland plant biomass is context specific. The underlying mechanisms, however, are uncertain. A likely explanation is that flooding has both direct effects by exerting stress on plants and indirect effects by affecting soil nutrient availability. The net effect would be context‐specific and might depend on season. Here, we tested two potential factors mediating the flooding effects on wetland plant biomass: soil nutrient availability and season. We carried out a field investigation in the lakeshore meadows of the Poyang Lake floodplain, China, along a flooding duration gradient during the non‐flooding period. To test the interaction between flooding duration and soil nutrients, we carried out a nutrient (N and P) addition experiment in two types of communities with different flooding durations. The above‐ground biomass (AGB) decreased with flooding duration in winter but had a quadratic response in spring, suggesting that the direct negative effect of flooding was stronger in winter than in spring. Soil total N content, total P content, and N:P ratio showed quadratic responses to flooding duration. Our results supported the hypotheses that the influence of nutrient limitation decreased with flooding duration and was greater in spring than in winter. The evidence showed that, with longer flooding duration and in winter than in spring, the correlations between AGB and soil nutrient content were weaker, leaf N and P content of Carex cinerascens were stronger, and AGB response ratio to nutrient addition was lower. Meanwhile, the relative importance of N versus P to wetland plant biomass varied with flooding duration. Consequently, indirect effects of flooding duration on AGB via soil nutrient availability were much less important than direct effects in winter or with long flooding duration, but were more important in spring or with short flooding duration. Therefore, the effects of flooding on wetland plant biomass depended on flooding duration, soil nutrient availability, and season.

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“…Similar observations have been made by House et al (1995), who reported a fast initial reaction of P-adsorption under oxic conditions, with about 60% uptake in the first half-hour. Various mechanisms of phosphate removal were studied in floodplains, such as, e.g., assimilation by autotrophic and heterotrophic organisms, interactions with the sediment, and output to the main channel (Noe et al, 2019). Despite the high importance of these processes for the phosphorus cycling, in general, we think that biotic uptake played a minor role in the removal of the imported P in the Lower Lobau due to decreased phytoplankton densities during flooding (Weigelhofer et al, 2015).…”

Section: Relevant Processes In Phosphorus Cycling In Water and Sedimentsmentioning

confidence: 96%

“…Phosphorus plays a central role in the biogeochemical cycling in floodplains (Wolf et al, 2013) and river systems (Records et al, 2016;Weigelhofer et al, 2018). The availability of soluble reactive phosphorus (SRP) in floodplains is controlled by a variety of internal biotic and abiotic processes, such as, e.g., assimilation by organisms, organic matter mineralization, and adsorption/desorption processes at the sediment/water interface (Noe et al, 2019). However, unlike other standing water bodies, floodplains are also subject to frequent temporally and spatially restricted inputs of river water.…”

Section: Introductionmentioning

confidence: 99%

Effect of Hydrological Connectivity on the Phosphorus Buffering Capacity of an Urban Floodplain

Preiner

Bondar‐Kunze

Pitzl

et al. 2020

Front. Environ. Sci.

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Floodplains can perform nutrient buffering functions and therefore influence the riverine nutrient dynamics depending on the extent of the hydrological connectivity. This work focused on quantifying the adsorption/desorption potential of a degraded floodplain of the Danube River (Lower Lobau) based on sediment characterization (grain size distribution, organic content, and P-fractions) and sediment type-specific P-adsorption via batch experiments. We established an adsorption/desorption budget model with a high temporal and spatial resolution. With this model, we identified spatial patterns related to hydrology and calculated the phosphorus-buffering capacity of permanent and temporary floodplain water bodies. Sediment characteristics were defined by the distance to the inflow area and the hydrological connectivity of the floodplain water bodies. The main factor for the concentration of total phosphorus (P tot) in the sediments was the grain size distribution. P tot was 10 times higher in silt-dominated sediments compared with gravel-dominated sediments. Inorganic phosphorus (P inorg) ranged between 36 and 90%, depending on the organic content of the sediments. Both the adsorption and the desorption potential of soluble reactive phosphorus (SRP) were highest in large, frequently connected water bodies and were strongly controlled by hydrology. The total adsorption potential of the floodplain was up to 40 times higher in wet years (e.g., 2002) than in dry years (e.g., 2003), when floodplain water bodies were connected less frequently to the main channel of the Danube. Up to 75% of the adsorbed SRP was desorbed and released into the water column after periods of connection. Consequently, SRP adsorption directly reduced the P-load in the Danube River main channel. The adsorption/desorption mechanisms worked as a buffering system by taking up the SRP imported during floods and releasing it over a longer period after the floods. This stimulated high primary production in the floodplain water bodies and impacted the overall P-retention of the floodplain.

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The effects of restored hydrologic connectivity on floodplain trapping vs. release of phosphorus, nitrogen, and sediment along the Pocomoke River, Maryland USA

Cited by 22 publications

References 81 publications

Analysing the potential to restore the multi‐functionality of floodplain systems by considering ecosystem service quality, quantity and trade‐offs

Analysing the potential to restore the multi‐functionality of floodplain systems by considering ecosystem service quality, quantity and trade‐offs

Effects of flooding duration on wetland plant biomass: The importance of soil nutrients and season

Effect of Hydrological Connectivity on the Phosphorus Buffering Capacity of an Urban Floodplain

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