Effects of drying on phosphorus uptake in re-flooded lake sediments

Dieter, Daniela; Herzog, Christiane; Hupfer, Michael

doi:10.1007/s11356-015-4904-x

Cited by 57 publications

(35 citation statements)

References 63 publications

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“…Our sediment had high extractable Al:TP and Fe:TP ratios (>molar ratio of Al NaOH extractable :P BD extractable = 25), indicating the P adsorption rather than desorption capacity of our sediments as found in other studies (Burford et al., ; Kopáček et al., ). In addition, based on previous studies, sediment P influx rates tested in P‐enriched water (2 mg L −1 ) was over 390 mg P day −1 kg −1 for dried sediment (Kerr et al., ), or over 50 mg P day −1 m −2 for wet sediment (Dieter, Herzog, & Hupfer, ). This is much higher than the maximum PO 4 3− release from N. indica plants in our study, which had a maximum of 10 mg P day −1 kg −1 for dried sediment, or 20 mg P day −1 m −2 for wet sediment after adsorption.…”

Section: Discussionmentioning

confidence: 92%

Macrophyte beds in a subtropical reservoir shifted from a nutrient sink to a source after drying then rewetting

et al. 2017

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Macrophytes play a key role in assimilating and storing nutrients in shallow aquatic ecosystems, but their capacity to act as a long‐term nutrient sink can be affected by water level fluctuations. Water level drawdown in reservoirs followed by rewetting may mobilise a significant nutrient pool. These nutrients can be stored in the littoral zone in dead or dormant macrophytes, and in the desiccated sediments within the macrophyte beds. However, the contribution of desiccated macrophyte beds to nutrient release upon rewetting has not been well quantified. Our study examined the effect of rewetting the previously desiccated waterlily Nymphoides indica (Menyanthaceae) in treatments (1) without sediments (N.i.−Sed), and (2) with sediments in N. indica beds (N.i.+Sed) on water quality. We found that longer drying duration increased dissolved nutrients (nitrate/nitrite, ammonium and total dissolved organic nitrogen/phosphorus) and organic carbon release from N.i.+Sed and N.i.−Sed treatments after rewetting. In the N.i.+Sed treatment with <4 weeks of desiccation, all N. indica plants regenerated from roots after subsequent rewetting. In addition, the resulting nutrient/carbon release was not significantly different to the control treatment which did not have desiccation. A significant increase in dissolved nutrient and carbon concentrations in the water column was found in treatments with more than 10 weeks of desiccation followed by rewetting. This coincided with the sediment reaching its minimum moisture content. Furthermore, chlorophyll a (Chl‐a) concentrations in the overlying water also increased with more than 10 weeks of desiccation, presumably in response to the increased nutrient availability and the removal of competition for nutrients from macrophytes. On the basis of our laboratory experiments, we calculated the potential effect of desiccated and rewetted N. indica beds on water quality in a local N. indica‐dominated reservoir after water level drawdown. We also separated the contribution of N. indica plants from their macrophyte beds on water quality changes. Fourteen days after rewetting, the total dissolved nutrients released from N. indica alone (N.i.−Sed) could contribute 0.5% of the total nitrogen and 29% of total phosphorus to the water column concentrations in the whole reservoir. In contrast, N. indica beds (N.i.+Sed) contributed more total dissolved nitrogen (4.3%) but less total dissolved phosphorus (0.3%) release into the water column. The higher nitrogen release for the N.i.+Sed treatment was likely due to the organic matter decomposition in the sediment in macrophyte beds. In contrast, the less dissolved phosphorus release, compared with the N. indica alone, was likely the result of phosphate adsorption by previously desiccated soil particles and/or assimilation by phytoplankton, since the phytoplankton biomass (as measured by Chl‐a concentrations) was significantly higher in the N.i.+Sed treatment. This study highlights the importance of managing both the duration and rate of water l...

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Section: Discussionmentioning

confidence: 92%

Macrophyte beds in a subtropical reservoir shifted from a nutrient sink to a source after drying then rewetting

et al. 2017

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“…After 10 d of draining, the concentrations of Fe-P, Al-P, and O-P during the reflooding period were greater than those during the flooding period. Several studies have examined P transformations in flooded-drained soils [9,14,40,46,47]. Furthermore, Ca-P was different in the four soils and increased only in the soil with high initial Ca-P.…”

Section: Relationships Between Olsen P and Dissolved P In Pore Watermentioning

confidence: 99%

“…Olsen P is also a good index for representing soil nutrient status of high pH soils [47]. According to the UK Agricultural Development and Advisory Service (ADAS), Olsen P concentrations greater than 46 mg/kg indicate a high nutrient status [50].…”

Section: Relationships Between Olsen P and Dissolved P In Pore Watermentioning

confidence: 99%

Phosphorus Dynamics in Long-Term Flooded, Drained, and Reflooded Soils

Tian

Dong

Karthikeyan

et al. 2017

Water

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Abstract:In flooded areas, soils are often exposed to standing water and subsequent drainage, thus over fertilization can release excess phosphorus (P) into surface water and groundwater. To investigate P release and transformation processes in flooded alkaline soils, wheat-growing soil and vegetable-growing soil were selected. We flooded-drained-reflooded two soils for 35 d, then drained the soils, and 10 d later reflooded the soils for 17 d. Dissolved reactive phosphorus (DRP), soil inorganic P fractions, Olsen P, pH, and Eh in floodwater and pore water were analyzed. The wheat-growing soil had significantly higher floodwater DRP concentrations than vegetable-growing soil, and floodwater DRP in both soils decreased with the number of flooding days. During the reflooding period, DRP in overlying floodwater from both soils was less than 0.87 mg/L, which was 3-25 times less than that during the flooding period. Regardless of flooding or reflooding, pore water DRP decreased with flooding days. The highest concentration of pore water DRP observed at a 5-cm depth. Under the effect of fertilizing and flooding, the risk of vertical P movement in 10-50 cm was enhanced. P diffusion occurred from the top to the bottom of the soils. After flooding, Al-P increased in both soils, and Fe-P, O-P, Ca 2 -P decreased, while Fe-P, Al-P, and O-P increased after reflooding, When Olsen P in the vegetable-growing soil exceeded 180.7 mg/kg and Olsen P in the wheat-growing soil exceeded 40.8 mg/kg, the concentration of DRP in pore water increased significantly. Our results showed that changes in floodwater and pore water DRP concentrations, soil inorganic P fractions, and Olsen P are significantly affected by fertilizing and flooding; therefore, careful fertilizer management should be employed on flooded soils to avoid excess P loss.

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“…Of course there are other important impacts of WLF on lake ecosystems besides effects on the littoral zone. For example, temperature dynamics, biochemical processes and nutrient levels are altered if sediments undergo wet-dry cycles due to WLF [13,14].…”

Section: Ecological Benchmarks Within the Reservoir: The Ecological Ementioning

confidence: 99%

Integrating Economic and Ecological Benchmarking for a Sustainable Development of Hydropower

et al. 2016

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Abstract:Hydropower reservoirs play an increasingly important role for the global electricity supply. Reservoirs are anthropogenically-dominated ecosystems because hydropower operations induce artificial water level fluctuations (WLF) that exceed natural fluctuations in frequency and amplitude. These WLF have detrimental ecological effects, which can be quantified as losses to ecosystem primary production due to lake bottoms that fall dry. To allow for a sustainable development of hydropower, these "ecological costs" of WLF need to be weighed against the "economic benefits" of hydropower that can balance and store intermittent renewable energy. We designed an economic hydropower operation model to derive WLF in large and small reservoirs for three different future energy market scenarios and quantified the according losses in ecosystem primary production in semi-natural outdoor experiments. Our results show that variations in market conditions affect WLF differently in small and large hydropower reservoirs and that increasing price volatility magnified WLF and reduced primary production. Our model allows an assessment of the trade-off between the objectives of preserving environmental resources and economic development, which lies at the core of emerging sustainability issues.

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Effects of drying on phosphorus uptake in re-flooded lake sediments

Cited by 57 publications

References 63 publications

Macrophyte beds in a subtropical reservoir shifted from a nutrient sink to a source after drying then rewetting

Macrophyte beds in a subtropical reservoir shifted from a nutrient sink to a source after drying then rewetting

Phosphorus Dynamics in Long-Term Flooded, Drained, and Reflooded Soils

Integrating Economic and Ecological Benchmarking for a Sustainable Development of Hydropower

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