Spatial distribution of sediment phosphorus in a Ramsar wetland

Crocker, Ry; Blake, William; Hutchinson, Thomas H.; Comber, Sean

doi:10.1016/j.scitotenv.2020.142749

Cited by 20 publications

(9 citation statements)

References 36 publications

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“…On the other hand, the general lack of collinearity associated with the relative proportions of fine‐grained suspended sediment fractions (clay and silt) and total P is most likely due to the influence of particulate organic matter (Evans et al, 2004; Foster & Lees, 1999) and minor differences in particle size composition of the suspended sediments in the tributary and reforming channels (e.g., Crocker et al, 2021). Most of the suspended sediment in the tributary and reforming channels comprises silt‐sized particles, with minor differences in clay contents.…”

Section: Discussionmentioning

confidence: 99%

Valley‐bottom wetlands as temporary buffers for source‐to‐sink dispersal of sediment and associated phosphorus in dryland landscapes

Wiener,

Grenfell

2024

Earth Surf Processes Landf

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Sediment trapping in wetlands is an essential ecosystem service, with implications for downstream ecosystems and water users. There is however limited empirical evidence of the contemporary rates and magnitude of sediment trapping in valley‐bottom wetlands. Time‐averaged suspended sediment samples from the inlets and outlets of forestry‐ and agriculturally‐impacted valley‐bottom wetlands with contrasting morphometric characteristics were compared in terms of suspended sediment and associated total phosphorous (total P) fluxes over annual scales, a dataset that was limited by Covid travel constraints. Although both wetlands were net depositional, contemporary suspended sediment mass balances for the agriculturally‐impacted wetland revealed a temporal change in the amount of sediment trapped over two water years (2019/2020 and 2020/2021), with trapping efficacies of 91% and 24%, respectively. The proportion of sediment trapped in the water year of 2020/2021 within the adjacent wetland, with a small commercially forested catchment, was up to 4 times higher than the agriculturally‐impacted wetland, which drained a larger catchment. Rates of total P retention showed that the agriculturally‐impacted wetland was a net sink for phosphorus in 2019/2020, but shifted to a source of phosphorus in 2020/2021 as the export of suspended sediment was enhanced. However, this contrasts with the forestry‐impacted wetland, which was a net sink of sediment and associated phosphorus during the one‐year study period of 2020/2021. Overall, despite data constraints, this study suggests that the efficacy of valley‐bottom wetlands in the delivery of sediment trapping and phosphorus removal ecosystem services varies temporally and spatially. This variability is potentially related to the interaction between annual rainfall regimes, catchment size and wetland geomorphic character. The temporary nature of sediment recycling processes could serve to balance wetland dynamics by regulating vertical growth of valley floors and longitudinal slope stability and should be considered in catchment management and wetland restoration planning strategies.

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Section: Discussionmentioning

confidence: 99%

Valley‐bottom wetlands as temporary buffers for source‐to‐sink dispersal of sediment and associated phosphorus in dryland landscapes

Wiener,

Grenfell

2024

Earth Surf Processes Landf

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“…Aquatic plants can reduce eutrophication and increase phytoplankton diversity, thereby providing guidance for the restoration and protection of aquatic ecosystems, as excess phosphates in water leads to algae growth or eutrophication [15][16][17][18][19].…”

Section: Methodsmentioning

confidence: 99%

Use of higher aquatic vegetation for post-treatment of wastewater

Урмитова

Nizamova

2021

E3S Web Conf.

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The article presents the features of cascade phyto-treatment facilities, bio plateau with an open water mirror. Such structures are similar to natural wetland objects. The plant species on the cascades and their effect in the post-treatment of wastewater are considered. Natural biological treatment of wastewater with algae roots is one of the most effective methods of treatment. This method allows you to clean polluted wastewater without harming the environment. Aquatic plants intensify the purification process, remove biogenic elements, actively using them in their nutrition, remove heavy metals and organic substances from the water and accumulate in the root system, which are difficult to decompose and thus improve the process of self-purification of reservoirs. The article pays great attention to the project «The Resilient Ribbon: A Timeless Legend of Kazan». The essence of the project is the natural self-purification of the city lake Nizhny Kaban in Kazan, where the root system of plants is used to purify water from mixtures, phenols and phosphates, heavy metals and a number of other harmful substances. The results of laboratory studies of water quality after treatment at cascade phyto-treatment facilities are presented.

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“…Based on the principles of sample availability, representativeness and uniformity, we have taken into full account of the varying history of wetlands, patterns of land use, coverage of vegetation and types of soil in the region (Crocker et al 2021), We have collected 180 soil samples in 2019 and 2020, and we have recorded the eld coordinates via GPS with precision of 3-5 m (Xiao et al, 2019). In the vicinity of each sampling point, we have taken samples three times for every 50-100 m and fully mixed them to form a complete soil sample (Gu et al 2019).…”

Section: Collection Of Soil Samples and Test Analysismentioning

confidence: 99%

Impact Imposed by Urbanization on Soil Heavy Metal Content of Lake Wetland and Evaluation of Ecological Risks in East Dongting Lake in China

Yang

Kai

et al. 2021

Preprint

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The urbanization is regarded as the major factor related to human activities that may interfere with the natural ecosystem. In this study, we have selected the wetland of East Dongting Lake as the research area. We have collected 180 soil samples (within the range of 0–20 cm, and 20cm-40cm), and we have measured the contents of their physicochemical properties (including salinity, pH value, soil particle composition, soil organic carbon, nitrate nitrogen and rapidly available phosphorus) as well as heavy metal elements (including As, Hg, Cd, Pb, Ni and Cr). We have adopted the methods of multivariate statistical analysis and inverse distance weighted (IDW) interpolation, so as to to reveal the sources and distribution characteristics of heavy metal content in soil in the research area. By adopting the potential ecological risk index (PERI) method proposed by Hakanson, we intend to assess the PERI values of heavy metals. Our research findings have shown that: (1) 8 sorts of heavy metals have shown positive correlation with each other. As, Hg and Zn have shown a significantly positive correlation with SOC (P < 0.01); As, Ni, Cr and Zn have shown a significantly positive correlation with AP (P < 0.01); As and Pb have shown a significantly positive correlation with Clay (P < 0.01); whereas Hg and Zn have shown a significantly negative correlation with Silt (P < 0.01); As and Pb have shown a significantly negative correlation with Sand (P < 0.01). (2) During urbanization, the elements of Cd, Ni, As, Hg and Pb might be enriched due to agricultural and industrial activities, whereas the use of fertilizers and pesticides constitute one of the major factors contributing to the increase of Cd and Pb contents in soil. (3) Influenced by the varying land patterns and with exception to Cu, the Fe-normalized concentrations have shown significant variations among different types of land use (P < 0.05). Specifically, there is a significantly higher level of Cd, Zn, Pb and Hg contents in the agricultural land than other types of land use, whereas there is a slightly higher level of heavy metal content in the mudflats than that in the grassland. In addition, the content of heavy metals in woodland remains relatively stable, and with exception to As, the content of heavy metals in woodland is the lowest among the five types of land. (4) The average value of the comprehensive PERI in heavy metals amounts to 555.03, representing a strong degree of ecological risks. Specifically, the proportion of sampling points of Cd that have a high level of ecological risks amounts to 36.51%, which is the primary element contributing to heavy metal pollution in the region, especially in the agricultural land.

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Spatial distribution of sediment phosphorus in a Ramsar wetland

Cited by 20 publications

References 36 publications

Valley‐bottom wetlands as temporary buffers for source‐to‐sink dispersal of sediment and associated phosphorus in dryland landscapes

Valley‐bottom wetlands as temporary buffers for source‐to‐sink dispersal of sediment and associated phosphorus in dryland landscapes

Use of higher aquatic vegetation for post-treatment of wastewater

Impact Imposed by Urbanization on Soil Heavy Metal Content of Lake Wetland and Evaluation of Ecological Risks in East Dongting Lake in China

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