Factors affecting phosphorus release from intact lake sediment cores

Holdren, G. Chris; Armstrong, David E.

doi:10.1021/es60161a014

Cited by 325 publications

(142 citation statements)

References 21 publications

Supporting

Mentioning

133

Contrasting

Unclassified

Order By: Relevance

“…In addition to nutrient loading, sediment release is also an important source of nutrients in natural conditions. Factors that affect the release of P from sediment include temperature, pH, oxygen condition, bioturbation, and sediment type (Boers 1991;Holdren and Armstrong 1980;North et al 2015). In shallow waters, P released from the sediment can soon be mixed into the entire water column, while in the deep stratified Miyun Reservoir, the released P is trapped in the hypolimnion and is unavailable to the phytoplankton to a large extent (Kolzau et al 2014).…”

Section: Nutrient Thresholds Needed For Controlling Algal Blooms In Tmentioning

confidence: 99%

Critical nutrient thresholds needed to control eutrophication and synergistic interactions between phosphorus and different nitrogen sources

Zeng

Qin

Bao

et al. 2016

Environ Sci Pollut Res

View full text Add to dashboard Cite

Eutrophication is one of the greatest threats to global freshwater ecosystems. The phytoplankton responses to nutrient inputs vary in different water bodies, so it is particularly important to determine the nutrient thresholds and synergistic interactions between nutrients in different freshwater ecosystems. Field sampling and bioassay experiments were conducted to determine the thresholds of soluble reactive phosphorus (SRP), nitrate-nitrogen (NO 3 -N), and ammonium-nitrogen (NH 4 -N) in Miyun Reservoir. A separate nutrient addition bioassay was designed to assess the synergistic interactions between these nutrients. Chlorophyll a (Chl a) concentrations were used to estimate phytoplankton biomass. The results showed the following: (1) nutrient threshold bioassay indicated that eutrophication thresholds of SRP, NO 3 -N, and NH 4 -N should be targeted at below 0.04 mg P L −1 , 0.5 mg N L −1 , and 0.3 mg N L −1 , respectively, to limit the growth of phytoplankton. (2) The stimulatory effect of BNH 4 -N plus P^on phytoplankton biomass was greater than (4) Ammonium was an important factor for the growth of phytoplankton and inputs of both NH 4 -N and NO 3 -N should be reduced to control bloom formation. Our findings imply that although P load reduction is important, appropriate reductions of all forms of N in watershed is recommended in the nutrient management strategy for Miyun Reservoir.

show abstract

Section: Nutrient Thresholds Needed For Controlling Algal Blooms In Tmentioning

confidence: 99%

Critical nutrient thresholds needed to control eutrophication and synergistic interactions between phosphorus and different nitrogen sources

Zeng

Qin

Bao

et al. 2016

Environ Sci Pollut Res

View full text Add to dashboard Cite

show abstract

“…The study was carried out in the Laurentian Trough, an environment particularly suited for this type of study because the properties of the bottom water keep constant some of the factors that are known to affect phosphate release from sediments (Holdren and Armstrong 1980). In the deep water, which originates in the western Atlantic Ocean, neither the salinity (S = 34.5) nor the temperature (4.5"C) varies seasonally, and Yeats (1988) has shown that the phosphate and oxygen concentrations change only slightly along the 1,200-km length of the trough.…”

mentioning

confidence: 99%

The phosphorus cycle in coastal marine sediments

et al. 1992

View full text Add to dashboard Cite

Approximately half of the sedimentation flux of particulate phosphorus in the Laurentian Trough in the Gulf of St. Lawrence is mobilized within the sediment and returned to the water column. In the oxidizing surface sediment, a major portion of the sedimentation flux of organic phosphorus is mineralized, and the released phosphate is partitioned between the pore water and surface adsorption sites. Surface-adsorbed phosphate is released to the pore water as needed to replace dissolved phosphate that escapes to the overlying water. Most of the phosphate is released deeper in the sediment column from iron oxides undergoing reduction. The nonmobilized phosphorus, which is buried with the accumulating sediment, appears to consist mostly of stable minerals such as apatite.The concentration of dissolved phosphate in sediment pore waters increases sharp!y across the sediment-water interface from 2 pmol PO, liter-l in the bottom water to 6+3 pmol PO, liter-' in the top centimeter, remains almost constant at this value down to 5-l 5-cm depth, and then increases rapidly with further depth. In the region of constant concentration, phosphate is buffered by adsorption-desorption equilibria with the sediment. The production rate of phosphate, the buffering capacity of the sediment, and the thickness of the diffusive boundary layer at the sediment-water interface control the shape of the pore-water profile.In the aquatic environment, dissolved phosphate is consumed during the growth of phytoplankton and is regenerated during bacterial decomposition of organic matter. Much of the regeneration takes place in the water, but in relatively shallow environAcknowledgments

show abstract

“…The relationship between mean depth and TP is somewhat more complex but proportionally more nutrients are lost from deep lakes via sedimentation processes. In contrast, most shallow lakes are permanently mixed (polymictic) with a consequent lack of stratification of temperature and oxygen, and increased potential for the recycling of nutrients (Holdren and Armstrong 1980;Carrick et al 1994). Interestingly, the small group of shallow marl lakes had concentrations of ~30 µg L -1 , a similar range to those seen in the medium alkalinity shallow waters.…”

Section: Chemical Reference Conditionsmentioning

confidence: 98%

The use of diatom records to establish reference conditions for UK lakes subject to eutrophication

Bennion

Simpson

2010

J Paleolimnol

View full text Add to dashboard Cite

A knowledge of pre-disturbance conditions is important for setting realistic restoration targets for lakes. For European waters this is now a requirement of the European Council Water Framework Directive (WFD) where ecological status must be assessed based on the degree to which present day conditions deviate from reference conditions. Here, we employ palaeolimnological techniques, principally inferences of total phosphorus from diatom assemblages (DI-TP) and classification of diatom composition data from the time slice in sediment cores dated to ~1850 AD, to define chemical and ecological reference conditions, respectively, for a range of UK lake types. The DI-TP results from 169 sites indicate that reference TP values for low alkalinity lakes are typically < 10 µg L -1 and in many cases < 5 µg L -1 , whilst those for medium and high alkalinity lakes are in the range 10-30 µg L -1 and 20-40 µg L -1 , respectively. Within the latter two alkalinity types, the deeper waters (> 3 m mean depth) generally had lower reference TP concentrations than the shallow sites. A small group of shallow marl lakes had concentrations of ~30 µg L -1 . Cluster analysis of diatom composition data from 106 lakes where the key pressure of interest was eutrophication identified three clusters, each associated with particular lake types, suggesting that the typology has ecological relevance, although poor cross matching of the diatom groups and the lake typology at type boundaries highlights the value of a site-specific approach to defining reference conditions. Finally the floristic difference between the reference and present day (surface sample) diatom assemblages of each site was estimated using the squared chord distance dissimilarity coefficient.Only 25 of the 106 lakes experienced insignificant change and the findings indicate that eutrophication has impacted all lake types with > 50% of sites exhibiting significant floristic change.The study illustrates the role of the sediment record in determining both chemical and ecological reference conditions, and assessing deviation from the latter. Whilst restoration targets may require modification in the future to account for climate induced alterations, the long temporal perspective offered by palaeolimnology ensures that such changes are assessed against a sound baseline.3

show abstract

Factors affecting phosphorus release from intact lake sediment cores

Cited by 325 publications

References 21 publications

Critical nutrient thresholds needed to control eutrophication and synergistic interactions between phosphorus and different nitrogen sources

Critical nutrient thresholds needed to control eutrophication and synergistic interactions between phosphorus and different nitrogen sources

The phosphorus cycle in coastal marine sediments

The use of diatom records to establish reference conditions for UK lakes subject to eutrophication

Contact Info

Product

Resources

About