Nutrients retention in a small subtropical wetland (México)

In tropical areas very few studies have analysed wetlands’ ability to control nutrients. We analysed the efficiency of the Pátzcuaro subtropical wetland in Mexico to retain nutrients (total phosphorus: TP; soluble reactive phosphorus: PO43-, nitrite: NO2- and nitrate: NO3-) and total suspended solids (TSS) and its temporal variability from November 2011 to October 2012, where two hydrological different periods (dry and wet periods) were included. The results indicate that, annually, this wetland reduced TP, 30.4%; PO43-, 19.2%; NO2-, 2.5%; NO3-, 17.6%; and TSS, 14.7%. However, the reduction % rose to 55.3% for TP and to 47.3% for PO43- during the dry period and to 14.1 % for NO2-, 49% for NO3- and 44.5% for TSS during the rainy period. These results show dependence on the hydrological cycle, although P retention is also related with uptake by a dense macrophyte community and with organic matter accumulation. The results obtained suggest that removal of N is due mainly to denitrification. TSS retention seems to respond to low speed hydraulics and the resistance generated by macrophytes roots and floating plants. Like other studies in temperate environments, this wetland seems to remove more efficiently P than N. Unlike that in temperate environments where the highest nutrient retention occurs in autumn, we found the highest retention values for both NO2- and NO3- during summer (rainy period), and the lowest for P, probably due to release of P for the senescence of wetland plants during this period.

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Periphytic algae dynamics in lentic ecosystems in the Brazilian semiarid

Brazilian Journal of Biology ◽

10.1590/1519-6984.16815 ◽

2016 ◽

Vol 77 (3) ◽

pp. 495-505 ◽

Cited By ~ 2

Author(s):

R. S. Cordeiro ◽

J. E. L. Barbosa ◽

G. Q. Lima Filho ◽

L. G. Barbosa

Keyword(s):

Aquatic Macrophytes ◽

Soluble Reactive Phosphorus ◽

Algal Community ◽

Aquatic Communities ◽

Dry Period ◽

Rainy Period ◽

Brazilian Semiarid ◽

High Concentrations ◽

Reactive Phosphorus ◽

Reduced Density

Abstract The hydrological periods drive the structure and organization of aquatic communities in semiarid regions. We hypothesize that a decrease of the precipitation during the dry period will favor the development of the periphytic algal community, leading to higher richness and density in this period. To test this hypothesis, we investigated the changes in the periphytic algal community structure in three shallow and eutrophic ecosystems of the Brazilian semiarid. The sampling was performed between 2007 and 2010 at two-mensal intervals. The sampling of periphytic algal was performed in aquatic macrophytes and rocks. The abiotic variables were analyzed simultaneously. Dominance in diatoms, cyanobacteria and chlorophytes, respectively, was observed in two periods. In the dry period, waters were alkaline and had high concentrations of nitrate and total phosphorus associated with the highest densities of Bacillariophyceae. In the rainy period the water was warmer, oxygenated and high concentrations of ammonia and soluble reactive phosphorus with diatoms remained dominant but with reduced density, while cyanobacteria and chlorophytes increased. Overall, periphytic algal community composition no responded to changes in the hydrological periods. However, the hydrological periods altered the dynamics of periphytic algal community, supported by the alternation of the most representative classes (diatoms and cyanobacteria) between the hydrologic periods. Our data suggest that the morphometric and chemical and physical characteristics of lentic aquatic ecosystems studied were more important in the dynamics of periphytic algal community than the hydrological periods and types of substrates.

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Effects of Lanthanum Modified Bentonite and Polyaluminium Chloride on the Environmental Variables in the Water and Sediment Phosphorus Form in Lake Yanglan, China

Water ◽

10.3390/w13141947 ◽

2021 ◽

Vol 13 (14) ◽

pp. 1947

Author(s):

Ling Su ◽

Chen Zhong ◽

Lei Gan ◽

Xiaolin He ◽

Jinlei Yu ◽

...

Keyword(s):

Suspended Solids ◽

Soluble Reactive Phosphorus ◽

Particulate Phosphorus ◽

Modified Bentonite ◽

Combined Application ◽

Water And Sediment ◽

Phosphorus Form ◽

Labile P ◽

Reactive Phosphorus ◽

Polyaluminium Chloride

The application of lanthanum modified bentonite (Phoslock®) and polyaluminium chloride (PAC) is popular in the restoration of European temperate lakes; however, the effects of the application on the concentrations of phosphorus (P) in both the water and the sediments have been poorly evaluated to date. We studied the effects of the application of Phoslock® + PAC on the concentrations of total phosphorus (TP), particulate phosphorus (PP), soluble reactive phosphorus (SRP), total suspended solids (TSS) and chlorophyll a (Chla) in the water, and different P forms in the sediments, in an isolated part of Lake Yanglan. The results showed that the concentrations of TP, PP, SRP, TSS and Chla decreased significantly after the addition of Phoslock® + PAC. Moreover, the concentrations of labile-P, reductant-soluble-P and organic-P in the sediments were also significantly decreased after the Phoslock® + PAC application. However, the concentrations of both the stable apatite-P and residual-P in the sediments after application of Phoslock® + PAC were much higher than the pre-addition values, while the concentrations of metal-oxide-P did not differ significantly between the pre- and post- application conditions. Our findings imply that the combined application of Phoslock® and PAC can be used in the restoration of subtropical shallow lakes, to reduce the concentrations of P in the water and suppress the release of P from the sediments.

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Effect of geomorphological setting and rainfall on nutrient exchange in mangroves during tidal inundation

Marine and Freshwater Research ◽

10.1071/mf10013 ◽

2010 ◽

Vol 61 (10) ◽

pp. 1197 ◽

Cited By ~ 33

Author(s):

María Fernanda Adame ◽

Bernardino Virdis ◽

Catherine E. Lovelock

Keyword(s):

Soluble Reactive Phosphorus ◽

Nutrient Retention ◽

Nutrient Concentrations ◽

Tidal Inundation ◽

Nutrient Exchange ◽

Tidal Cycles ◽

Negative Impacts ◽

Reactive Phosphorus ◽

Riverine Mangroves

One of the key ecosystem services provided by mangroves is their role in mediating nutrient exchange, thereby protecting coastal ecosystems from negative impacts of nutrient enrichment. In this study, we tested whether geomorphological setting and level of rainfall affect the intensity and direction of nutrient exchange. Our hypotheses were that tidal mangroves retain more nutrients than riverine mangroves and that nutrient retention is stronger during periods of high rainfall. Concentrations of soluble reactive phosphorus (SRP), nitrogen oxides (NOx–-N) and ammonium (NH4+) were measured from water entering and leaving the mangroves during tidal cycles. Our results show that nutrient concentrations were higher in the flood tide compared with the ebb tide by up to 28% for NOx–-N, 51% for SRP and 83% for NH4+, suggesting retention by the mangroves. Geomorphological setting determined nutrient exchange to some extent, with some riverine sites receiving more nutrients than tidal sites and thus, being more important in nutrient retention. Rainfall was important in determining nutrient exchange as it enhanced SRP and NH4+ retention. These results show that mangroves can improve water quality of creeks and rivers, and underscore the need for conservation of mangroves over a range of geomorphological settings.

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Sediment and Nutrient Retention in Ponds on an Agricultural Stream: Evaluating Effectiveness for Diffuse Pollution Mitigation

Water ◽

10.3390/w13121640 ◽

2021 ◽

Vol 13 (12) ◽

pp. 1640

Author(s):

John Robotham ◽

Gareth Old ◽

Ponnambalam Rameshwaran ◽

David Sear ◽

David Gasca-Tucker ◽

...

Keyword(s):

Suspended Solids ◽

Stream Water ◽

Organic Matter Content ◽

Soluble Reactive Phosphorus ◽

Nutrient Retention ◽

Size Composition ◽

Matter Content ◽

Storm Events ◽

Stream Water Quality ◽

On Line

The creation of ponds and wetlands has the potential to alleviate stream water quality impairment in catchments affected by diffuse agricultural pollution. Understanding the hydrological and biogeochemical functioning of these features is important in determining their effectiveness at mitigating pollution. This study investigated sediment and nutrient retention in three connected (on-line) ponds on a lowland headwater stream by sampling inflowing and outflowing concentrations during base and storm flows. Sediment trapping devices were used to quantify sediment and phosphorus accumulations within ponds over approximately monthly periods. The organic matter content and particle size composition of accumulated sediment were also measured. The ponds retained dissolved nitrate, soluble reactive phosphorus and suspended solids during baseflows. During small to moderate storm events, some ponds were able to reduce peak concentrations and loads of suspended solids and phosphorus; however, during large magnitude events, resuspension of deposited sediment resulted in net loss. Ponds filtered out larger particles most effectively. Between August 2019 and March 2020, the ponds accumulated 0.306 t ha−1 sediment from the 30 ha contributing area. During this period, total sediment accumulations in ponds were estimated to equal 7.6% of the suspended flux leaving the 340 ha catchment downstream. This study demonstrates the complexity of pollutant retention dynamics in on-line ponds and highlights how their effectiveness can be influenced by the timing and magnitude of events.

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Changes in water chemistry associated with beaver-impounded coastal marshes of eastern Georgian Bay

Canadian Journal of Fisheries and Aquatic Sciences ◽

10.1139/cjfas-2012-0431 ◽

2013 ◽

Vol 70 (6) ◽

pp. 834-840 ◽

Cited By ~ 6

Author(s):

Amanda Fracz ◽

Patricia Chow-Fraser

Keyword(s):

Water Chemistry ◽

Suspended Solids ◽

Coastal Wetland ◽

Soluble Reactive Phosphorus ◽

Total Suspended Solids ◽

Coastal Marshes ◽

Georgian Bay ◽

Reactive Phosphorus ◽

Chemical Conditions ◽

Unique Chemical

Coastal marshes of eastern Georgian Bay contain unique water chemistry that reflects mixing between the relatively ion-rich waters of Georgian Bay and the relatively ion-poor water draining the Canadian Shield landscape. These unique chemical characteristics may be dramatically altered when wetlands become hydrologically disconnected from Georgian Bay through beaver activity. We sampled 35 coastal marshes in Georgian Bay, 17 of which had beaver impoundments built at the outlet of the coastal wetland. Impounded marshes had significantly higher total phosphorus (30.2 versus 15.3 μg·L−1, p = 0.0015), soluble reactive phosphorus, (13.33 versus 3.7 μg·L−1, p ≤ 0.0001), total suspended solids (15.5 versus 2.1 mg·L−1, p ≤ 0.0001), turbidity (5.4 versus 1.6, p = 0.0004), and chlorophyll (6.2 versus 1.9 μg·L−1, p = 0.0004), but significantly lower pH (5.57 versus 6.95, p ≤ 0.0001), nitrates (0.03 versus 0.04 mg·L−1, p = 0.0416), and conductivity (47 versus 134 μS·cm−1, p ≤ 0.0001), indicative of reduced mixing with Georgian Bay. The mosaic of chemical conditions and altered hydrological connectivity associated with beaver impoundments in coastal marshes of Georgian Bay may affect the distribution of other wetland biota, and further studies should be conducted to ascertain these impacts.

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Characteristics of nutrient retention in a stormwater wetland during dry and wet days

Water Science & Technology ◽

10.2166/wst.2010.108 ◽

2010 ◽

Vol 61 (6) ◽

pp. 1535-1545 ◽

Cited By ~ 3

Author(s):

Qitao Yi ◽

Weiwei Lu ◽

Jianghua Yu ◽

Youngchul Kim

Keyword(s):

Nitrogen Concentration ◽

Soluble Reactive Phosphorus ◽

Nitrogen Retention ◽

Nutrient Retention ◽

Base Flow ◽

Agricultural Watershed ◽

Storm Flow ◽

Reactive Phosphorus ◽

Improved Design ◽

Rainy Days

A 0.23-ha pilot wetland was constructed to examine its effectiveness for the control of nonpoint source pollution (NPS) from a 7.42-ha agricultural watershed in Korea. The wetland was operated during base flow and storm flow conditions and monitored for four years (2006–2009). The wetland was operated under high hydraulic loading rates (HLRs, 0.78 m/day on average) during rainy days. The average influent nitrogen concentration was 9.8 mg/L during wet days, but around 11.6 mg/L during dry days. Due to the short hydraulic retention time (HRT) on wet days, nitrogen retention at the wetland was poor, only 6.1%; whereas, during dry days the efficiency was higher, around 17.9%. On rainy days, the wetland presented high retention for total phosphorus (TP), with an average efficiency of 68.3%, accompanied with a total suspended solids (TSS) removal of 84.7%. However, on dry days, the wetland showed positive soluble reactive phosphorus (SRP) retention other than TP. The interior of the wetland was observed to have different nutrients levels. Furthermore, suggestions are addressed in terms of improved design for better performance.

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Influence of Catchment and Stream Characteristics on Suspended Solids and Phosphorus Concentrations Across an agriculturally Intensive Watershed in Southern Ontario

10.32920/ryerson.14667957.v1 ◽

2021 ◽

Author(s):

Arsh Grewal

Keyword(s):

Partial Least Squares Regression ◽

Suspended Solids ◽

Soluble Reactive Phosphorus ◽

Least Squares Regression ◽

Flow Conditions ◽

Southern Ontario ◽

Hydrological Characteristics ◽

Creek Watershed ◽

Reactive Phosphorus ◽

The Relationship

The overall objective of this study is to determine the influence of landscape and hydrological characteristics on sub-catchment variability of total phosphorus (TP), soluble reactive phosphorus (SRP), the ratio of SRP and TP (SRP/TP), and total suspended solids (TSS). Fourteen longitudinal synoptic surveys were conducted for 13 sampling sites over a variety of flow conditions in the Innisfil Creek watershed located in southern Ontario. The surveys were split into baseflow and stormflow and partial least squares regression (PLSR) was used to analyze the relationship between watershed and hydrological characteristics, median concentrations of phosphorus, and TSS. The PLSR models indicate that buried tile drainage might be a major source of SRP in Innisfil Creek, while bank erosion is likely a dominant source of TSS. The results of this study can serve as the basis for future adaptive management experiments that seek to improve water quality in Innisfil Creek and beyond.

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Influence of Catchment and Stream Characteristics on Suspended Solids and Phosphorus Concentrations Across an agriculturally Intensive Watershed in Southern Ontario

10.32920/ryerson.14667957 ◽

2021 ◽

Author(s):

Arsh Grewal

Keyword(s):

Partial Least Squares Regression ◽

Suspended Solids ◽

Soluble Reactive Phosphorus ◽

Least Squares Regression ◽

Flow Conditions ◽

Southern Ontario ◽

Hydrological Characteristics ◽

Creek Watershed ◽

Reactive Phosphorus ◽

The Relationship

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Toward a versatile flow technique: Development and application of reverse flow dual-injection analysis (rFDIA) for determining dissolved iron redox species and soluble reactive phosphorus in seawater

Talanta ◽

10.1016/j.talanta.2021.122404 ◽

2021 ◽

Vol 232 ◽

pp. 122404

Author(s):

Luodan Chen ◽

Jin Xu ◽

Ting Wang ◽

Yongming Huang ◽

Dongxing Yuan ◽

...

Keyword(s):

Reverse Flow ◽

Soluble Reactive Phosphorus ◽

Redox Species ◽

Dissolved Iron ◽

Dual Injection ◽

Reactive Phosphorus ◽

Iron Redox ◽

Technique Development

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Seasonal Variations of Phosphorus Species in the Overlying and Pore Waters of the Tuohe River, China

Journal of Chemistry ◽

10.1155/2019/6727239 ◽

2019 ◽

Vol 2019 ◽

pp. 1-9

Author(s):

Qing Xu ◽

Xiaoping Yu ◽

Yafei Guo ◽

Tianlong Deng ◽

Yu-Wei Chen ◽

...

Keyword(s):

Seasonal Variations ◽

Yangtze River ◽

Algal Bloom ◽

Soluble Reactive Phosphorus ◽

Pore Waters ◽

Phosphorus Species ◽

Dissolved Phosphorus ◽

Vertical Distributions ◽

Reactive Phosphorus ◽

Main Factor

Overlying sediment and pore waters were collected in summer and winter at upstream (Jintang) and downstream (Neijiang) sites of the Tuohe River, which is one of the five largest tributaries of the Yangtze River in China. Phosphorus species, including soluble reactive phosphorus (SRP), soluble unreactive phosphorus (SUP), and total dissolved phosphorus (TDP), and some diagenetic constituents including dissolved Fe(II), Mn(II), and sulfide in overlying and pore waters, were measured systematically. The seasonal variations and vertical distributions of phosphorus species in overlying and pore waters at both sampling sites were obtained to elucidate some aspects of the transport and transformations of phosphorus. Based on the profiles of pore and overlying waters as well as the TDN/TDP data during an algal bloom in 2007, it was clearly demonstrated that phosphorus was the main factor limiting the phytoplankton growth in the Tuohe River.

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