Phosphorus fractionation in sediments of tropical semiarid reservoirs

Cavalcante, Herika; Araújo, Fabiana; Noyma, Natália Pessoa; Becker, Vanessa

doi:10.1016/j.scitotenv.2017.11.204

Cited by 97 publications

(38 citation statements)

References 66 publications

(97 reference statements)

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“…To determine the dose of LMB needed in the experiments, an estimate of the potentially releasable P in the sediment was required. Hereto, a sequential extraction protocol modified from Paludan and Jensen (1995) and used by Cavalcante et al (2018) to measure different P forms in the sediment was adopted. One gram of wet sediment was brought into each of four 50-mL Falcon tubes to which, as a first step, 25-mL anoxic demineralized water was added to extract the immediately available P. The tubes were shaken for 30 min (oxygen at the start was 0.21 and at the end 0.44 mg L −1 ).…”

Section: Sediment P Extractionmentioning

confidence: 99%

Managing Eutrophication in a Tropical Brackish Water Lagoon: Testing Lanthanum-Modified Clay and Coagulant for Internal Load Reduction and Cyanobacteria Bloom Removal

Magalhães

Noyma

Furtado

et al. 2018

Estuaries and Coasts

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The release of phosphorus (P) stored in the sediment may cause long-term delay in the recovery of lakes, ponds, and lagoons from eutrophication. In this paper, we tested on a laboratory scale the efficacy of the flocculant polyaluminium chloride (PAC) and a strong P-binding agent (lanthanum-modified bentonite, LMB) on their ability to flocculate a cyanobacterial bloom and hamper P release from a hypertrophic, brackish lagoon sediment. In addition, critical P loading was estimated through PCLake. We showed that cyanobacteria could be effectively settled using a PAC dose of 2 mg Al L −1 combined with 400-mg L −1 LMB; PAC 8 mg Al L −1 alone could also remove cyanobacteria, although its performance was improved adding low concentrations of LMB. The efficacy of LMB to bind P released from the sediment was tested based on potentially available sediment P. A dose of 400 g LMB m −2 significantly reduced the P release from sediment to over-standing water (either deionized water or water from the lagoon with and without cyanobacteria). In sediment cores, LMB + PAC reduced sediment P flux from 9.9 (± 3.3) to − 4.6 (± 0.3) mg P m −2 day −1 for the experimental period of 3 months. The internal P load was 14 times higher than the estimated P critical load (0.7 mg P m −2 day −1), thus even if all the external P sources would be ceased, the water quality will not improve promptly. Hence, the combined LMB + PAC treatment seems a promising in-lake intervention to diminish internal P load bellow the critical load. Such intervention is able to speed up recovery in the brackish lagoon once external loading has been tackled and at a cost of less than 5% of the estimated dredging costs.

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Section: Sediment P Extractionmentioning

confidence: 99%

Managing Eutrophication in a Tropical Brackish Water Lagoon: Testing Lanthanum-Modified Clay and Coagulant for Internal Load Reduction and Cyanobacteria Bloom Removal

Magalhães

Noyma

Furtado

et al. 2018

Estuaries and Coasts

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“…McLaren et al (2015) menggunakan metode fraksionasi untuk mengidentifikasi bentuk P yang terakumulasi pada tanah padang rumput. Cavalcante et al (2018) melakukan fraksionasi P untuk mengetahui bentuk fraksi P pada sedimen bendungan. Hartono et al (2015) melakukan penelitian tentang bentuk-bentuk fraksi fosfor pada tanah sawah di Pulau Jawa yang hasilnya menunjukkan adanya akumulasi fraksi fosfor dalam bentuk NaOH-P i yang terikat secara kemisorpsi dengan Fe dan Al pada permukaan tanah dan bentuk residual-P sehingga tidak tersedia bagi tanaman.…”

Section: Pendahuluanunclassified

Model Hubungan Fraksi P dengan Sifat Kimia Tanah Sawah pada Tiga Kelompok Bahan Induk Berbeda di Jawa Barat

Susanto¹,

Hartono²,

Anwar³

et al. 2020

J. Tanah dan Iklim

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Akumulasi P tanah sawah di Jawa Barat sudah sangat tinggi dan ini menyebabkan P tersedia yang dapat dimanfaatkan tanaman menjadi sedikit. Bahan induk (aluvium, sedimen dan volkan) berpengaruh terhadap dinamika, proses akumulasi, dan transformasi P di dalam tanah. Penelitian ini bertujuan untuk mengetahui bentuk fraksi P dan membuat model persamaan regresi untuk mengestimasi hubungan fraksi P dengan beberapa sifat kimia tanah. Metode penelitian yang digunakan yaitu survei lapang untuk pengambilan contoh tanah dan analisis tanah di laboratorium. Lokasi penelitian adalah tanah sawah di Jawa Barat. Pengambilan contoh tanah dilakukan secara komposit pada tiga garis transek dari utara ke selatan wilayah Jawa Barat pada 60 lokasi pada lapisan tanah 0-20 cm. Penetapan fraksi P tanah di laboratorium mengikuti prosedur fraksionasi secara sekuensial sesuai metode Tiessen dan Moir yang dimodifikasi. Hasil penelitian menunjukkan bahwa akumulasi P tanah sawah di Jawa Barat didominasi fraksi residual-P, NaOH-Po dan NaOH-Pi. Ketiga fraksi ini paling banyak ditemukan pada kelompok tanah sawah berbahan induk volkanik, kemudian sedimen dan terakhir aluvium. Ada tiga faktor utama yang berpengaruh terhadap distribusi fraksi P, yaitu: 1) Fe dan Al oksida, 2) C-organik dan kadar klei tanah, dan 3) basa-basa dapat ditukar, terutama Cadd. Model persamaan regresi yang cukup baik dalam mengestimasi fraksi P tanah sawah adalah model estimasi untuk fraksi NaOH-Pi dan NaOH-Po dengan nilai R 2 > 0,4 pada taraf p < 0,05.

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“…The paradigm that oxygen levels control the sediment P release via reductive dissolution of the Fe-P fraction in surface sediments has been accepted as the classic model for a long time (Einsele, 1936(Einsele, , 1938Moosmann et al, 2006). Under anoxic conditions, P bound to redox-sensitive Fe and Al−Fe (oxyhydr)oxides can be potentially released from surface sediments into lake water (Burley et al, 2001), which was supported by numerous short-term (over the course of days or a season) laboratory or in situ studies (Chen et al, 2018;Smith et al, 2011). Based on this paradigm, it was assumed that an oxic sediment-water interface might limit the release of Fe-P from sediments and therefore improve P retention in lake sediments.…”

mentioning

confidence: 96%

“…This information is crucial for predicting and ultimately managing sediment P release, especially in deep lakes, because hypolimnetic anoxia in deep lakes can lead to large loads of sediment P release. In contrast to the well-established studies about sediment P speciation in shallow polymictic lakes (e.g., Kaiserli et al, 2002;Søndergaard et al, 2001;Cavalcante et al, 2018), there are only a few studies available from seasonally stratified deep lakes. Furthermore, eutrophication has been demonstrated to affect sediment P release via controlling hypolimnetic anoxia and lake mixing regime in seasonally stratified deep lakes (Tu et al, 2019a).…”

mentioning

confidence: 99%

The influences of historic lake trophy and mixing regime changes on long-term phosphorus fraction retention in sediments of deep eutrophic lakes: a case study from Lake Burgäschi, Switzerland

Zander

Szidat

et al. 2020

Biogeosciences

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Abstract. Hypolimnetic anoxia in eutrophic lakes can delay lake recovery to lower trophic states via the release of sediment phosphorus (P) to surface waters on short timescales in shallow lakes. However, the long-term effects of hypolimnetic redox conditions and trophic state on sedimentary P fraction retention in deep lakes are not clear yet. Hypolimnetic withdrawal of P-rich water is predicted to diminish sedimentary P and seasonal P recycling from the lake hypolimnion. Nevertheless, there is a lack of evidence from well-dated sediment cores, in particular from deep lakes, about the long-term impact of hypolimnetic withdrawal on sedimentary P retention. In this study, long-term sedimentary P fraction data since the early 1900s from Lake Burgäschi provide information on benthic P retention under the influence of increasing lake primary productivity (sedimentary green-pigment proxy), variable hypolimnion oxygenation regimes (Fe∕Mn ratio proxy), and hypolimnetic withdrawal since 1977. Results show that before hypolimnetic withdrawal (during the early 1900s to 1977), the redox-sensitive Fe∕Mn-P fraction comprised ∼50 % of total P (TP) in the sediment profile. Meanwhile, long-term retention of total P and labile P fractions in sediments was predominantly affected by past hypolimnetic redox conditions, and P retention increased in sedimentary Fe- and Mn-enriched layers when the sediment-overlaying water was seasonally oxic. However, from 1977 to 2017, due to eutrophication-induced persistent anoxic conditions in the hypolimnion and to hypolimnetic water withdrawal increasing the P export out of the lake, net burial rates of total and labile P fractions decreased considerably in surface sediments. By contrast, refractory Ca–P fraction retention was primarily related to lake primary production. Due to lake restoration since 1977, the Ca–P fraction became the primary P fraction in sediments (representing ∼39 % of total P), indicating a lower P bioavailability of surface sediments. Our study implies that in seasonally stratified eutrophic deep lakes (like Lake Burgäschi), hypolimnetic withdrawal can effectively reduce P retention in sediments and potential for sediment P release (internal P loads). However, after more than 40 years of hypolimnetic syphoning, the lake trophic state has not improved nor has lake productivity decreased. Furthermore, this restoration has not enhanced water column mixing and oxygenation in hypolimnetic waters. The findings of this study are relevant regarding the management of deep eutrophic lakes with mixing regimes typical for temperate zones.

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Phosphorus fractionation in sediments of tropical semiarid reservoirs

Cited by 97 publications

References 66 publications

Managing Eutrophication in a Tropical Brackish Water Lagoon: Testing Lanthanum-Modified Clay and Coagulant for Internal Load Reduction and Cyanobacteria Bloom Removal

Managing Eutrophication in a Tropical Brackish Water Lagoon: Testing Lanthanum-Modified Clay and Coagulant for Internal Load Reduction and Cyanobacteria Bloom Removal

Model Hubungan Fraksi P dengan Sifat Kimia Tanah Sawah pada Tiga Kelompok Bahan Induk Berbeda di Jawa Barat

The influences of historic lake trophy and mixing regime changes on long-term phosphorus fraction retention in sediments of deep eutrophic lakes: a case study from Lake Burgäschi, Switzerland

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