Effects of sediment dredging on internal phosphorus: A comparative field study focused on iron and phosphorus forms in sediments

Jing, Liandong; Liu, Xingli; Bai, Song; Wu, Chenxi; Ao, Hongyi; Liu, Jiantong

doi:10.1016/j.ecoleng.2015.04.099

Cited by 36 publications

(10 citation statements)

References 22 publications

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“…Curbing the external N and P loads is effective in remediation but the sediment internal loading supplement compensates the loss [86]. Meanwhile sediment dredging is beneficial for internal nutrient deloading only after the external inputs are checked [87]. Trace metals bound to OM or Fe/Mn-oxides separate on their decomposition [88] and reductive dissolution respectively near hypolimnion-sediment overlap [85].…”

Section: Resultsmentioning

confidence: 99%

A Retrospective Environmental Assessment of the Natural Heritage of Dal Lake for Prospective Implication Scenarios

Bhat¹,

Khan²

2019

ESD

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Monitoring at 30 sampling sites of Dal Lake is carried out to assess its spatial-temporal heterogeneity under human pressures. P surpass critical eutrophic index ( 0.05 mgL ≤ -1 ) while nitrate-N persist beneath it ( 0.5 mgL ≤ -1 ). Semi-drainage hydrology recuperates basin volume. Autotrophic assimilation and biocalcification episodes drop conductivity. Anionic prevalence of HCO3and Clexist along Ca > Mg > Na > K cationic progression. Autochthonous sediment OM at typical < 10 C/N is the conventional nutrient source. Higher temperature and lower N:P ratio during summer develop P internal loading process. Cr, Ni and Zn exceed the sediment quality guidelines. OM enriched sediments and calcite co-precipitation curtails PTE mobility. Biomass parameters establish similar variations except species turn-over. OM immobilizes nutrients and OC provisions denitrification. Dal Lake exposed to anthro-urban intensification depends on comprehensive management interventions like National Plan for Conservation of Aquatic Ecosystems vital for insitu leniency control and lake-front improvement.

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Section: Resultsmentioning

confidence: 99%

A Retrospective Environmental Assessment of the Natural Heritage of Dal Lake for Prospective Implication Scenarios

Bhat¹,

Khan²

2019

ESD

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“…Curbing the external N and P loads is effective in remediation but the sediment internal loading supplement compensates the loss [35] and [67]. Meanwhile sediment dredging is beneficial for internal nutrient deloading only after the external inputs are checked [68]. Trace metals bound to OM or Fe/Mn-oxides separate on their decomposition and reductive dissolution respectively near hypolimnion-sediment overlap [35], [36] and [69].…”

Section: Discussionmentioning

confidence: 99%

A Spatio-Temporal Distribution and Dynamics of Major-, Minor- and Trace- Elements in Two Temperate Urban Lacustrine Ecosystems of Srinagar, Kashmir

Bhat¹,

Khan²

2019

EPP

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Water bodies act as indicators of the extent of anthropogenic interference and pressure while evolving exhibitive fluxes in intrinsic homeostasis. The ecological assessment of standard biophysicochemical variables through space-time monitoring in the region of anthro-urban intensification identifies such ecosystem responses. Sampling, preservation, preparation and analysis follow typical procedures for all the representative testers. Statistical procedures for inference of results involve Mean, Standard Deviation, Range, Correlation, Regression, Analysis of Variance (ANOVA), Cluster Analysis and Principal Components Analysis (PCA). Temperature, pH, conductivity and ionic composition of the surface waters have p<0.01 and R 2 >0.5. Total P perimeter outdid critical eutrophic index (≤ 0.05 mgL-1) but nitrate N persisted underneath it (≤ 0.5 mgL-1) ordinarily. Elevated nutrient levels reflect multiple human origins and catchment interventions. Priority pollutants (As, Cd, Cr, Cu, Pb, Ni and Se) remained below chronic levels with exception of Fe and Zn exceeding maximum permissible limits for irrigation purpose of the water. Major elements in surface sediments are Si> Ca> Mg> K> Na> P> S> Cl besides the micro and trace ones follow as Fe> Al> Zn> Mn> Cu> Cr> Ni> Co> As> Sn> Pb> Cd. Sediments correspond to calcite catchment character to conform their sink-selves. The peak biomass values as gm-2 are 880.2 in case of Myriophyllum aquaticum, 678.4 in Nelumbo nucifera, 182.4 in Ceratophyllum demersum and 45 in Salvinia natans. The upgraded biomass configuration coincides with supplementary bioconcentration. C/N <10 implies low decomposition rates and autochthonous origin of organic matter. A semidrainage type of flushing hydrology ensures low basin holding time for self-reclaimed nutrient balance. Sediment dredging is beneficial for internal nutrient deloading only after external inputs are curtailed. Biological scavenging and biogenic calcification together lower the bioavailability of nutrients and toxics. Hence, the systemic insitu pliability can prevail till exsitu lacustrine management fortifies euoecism to evade detrimental dysoecism.

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“…Curbing the external N and P loads is effective in remediation but the sediment internal loading supplement compensates the loss [73]. Meanwhile sediment dredging is beneficial for internal nutrient deloading only after the external inputs are checked [74]. Trace metals bound to OM or Fe/Mn-oxides [75] separate on their decomposition and reductive dissolution respectively near hypolimnion-sediment overlap [71].…”

Section: Discussionmentioning

confidence: 99%

Characterisation of Temperate Urban Lacustrine Surface-Sediments for Minerals and Metals in Comparison with Geochemical Indices and Sediment Quality Criteria

Nazir¹,

Khan²

2018

JEP

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The present surface sediment assessment in two temperate lacustrine ecosystems in the region of anthro-urban intensification in less than a century of progressive human history identifies ecosystem responses through space-time monitoring of variable spectrum and their gradients. Sediments have almost no outliers in box-plots across the select sites that suggest their tranquil nature. But temporal fluctuations in pH, bicarbonates, conductivity, OC, OM, TN and C/N can be visualised during Ca-Si dominance. The estimated percentage elemental composition of surface sediments on dry weight basis revealed the order Si > Ca > Mg > K > Na > P > S > Cl. Besides, the micro and trace element quantification represent the descending series of Fe > Al > Zn > Mn > Cu > Cr > Ni > Co > As > Sn > Pb > Cd while Hg and Se remained below detection level (BDL). Sediment pH remained on the basic side but slight acidic nature is noticed during late summer. Significant correlation occurs for conductivity with organic C and organic matter (p < 0.01) as the latter serves an established source for nutrient ions. Similar is the case with sediment organic C, organic matter and total N as being complementary to one another. A general slight gradual decline in nutrient concentration till culmination of active macrophytic growth phase can be associated with active/passive bioaccumulation or anoxic release from sediments. The Enrichment Factor classifies each trace element into "No Enrichment" class to "Very High Enrichment" category. The Geochemical Index (I geo) scale labels "Unpolluted" to "Highly Polluted" element groups in sediments. The construal of Contamination Factor differentiates between "Contaminated" and "Uncontaminated" score of elements. Integrated Pollution Index (IPI) and Pollution Load Index (PLI) also categorize the sites and lakes. Sediment Quality Guidelines (SQG's) How to cite this paper: Nazir, U. and Khan, A.B.

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Effects of sediment dredging on internal phosphorus: A comparative field study focused on iron and phosphorus forms in sediments

Cited by 36 publications

References 22 publications

A Retrospective Environmental Assessment of the Natural Heritage of Dal Lake for Prospective Implication Scenarios

A Retrospective Environmental Assessment of the Natural Heritage of Dal Lake for Prospective Implication Scenarios

A Spatio-Temporal Distribution and Dynamics of Major-, Minor- and Trace- Elements in Two Temperate Urban Lacustrine Ecosystems of Srinagar, Kashmir

Characterisation of Temperate Urban Lacustrine Surface-Sediments for Minerals and Metals in Comparison with Geochemical Indices and Sediment Quality Criteria

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