Fertilization and pH effects on processes and mechanisms controlling dissolved inorganic phosphorus in soils

2011 ◽  
Vol 75 (10) ◽  
pp. 2980-2996 ◽  
Author(s):  
Nicolas Devau ◽  
Philippe Hinsinger ◽  
Edith Le Cadre ◽  
Bruno Colomb ◽  
Frédéric Gérard
Keyword(s):  
Inorganic Phosphorus ◽  
Ph Effects ◽  
Dissolved Inorganic Phosphorus

scholarly journals Dissolved inorganic phosphorus export to the coastal zone: Results from a spatially explicit, global model

2005 ◽  
Vol 19 (4) ◽  
pp. n/a-n/a ◽  
Author(s):  
John A. Harrison ◽  
Sybil P. Seitzinger ◽  
A. F. Bouwman ◽  
Nina F. Caraco ◽  
Arthur H. W. Beusen ◽  
...  
Keyword(s):  
Coastal Zone ◽  
Inorganic Phosphorus ◽  
Global Model ◽  
Spatially Explicit ◽  
Dissolved Inorganic Phosphorus ◽  
Phosphorus Export

scholarly journals Dark accelerates dissolved inorganic phosphorus release of high-density cyanobacteria

PLoS ONE ◽  
2020 ◽  
Vol 15 (12) ◽  
pp. e0243582
Author(s):  
Mengmeng Wang ◽  
Huifen Zhang ◽  
Menggaoshan Chen ◽  
Liuyan Yang ◽  
Yichen Yang
Keyword(s):  
Inorganic Phosphorus ◽  
Phosphorus Release ◽  
High Density ◽  
Freshwater Lakes ◽  
Microcosm Experiment ◽  
Release Process ◽  
Water Parameters ◽  
Degrading Bacteria ◽  
Phosphorus Source ◽  
Dissolved Inorganic Phosphorus

Bloom-forming cyanobacteria dramatically influence nutrient cycling in eutrophic freshwater lakes. The phosphorus (P) assimilation and release of bloom-forming cyanobacteria significantly may also affect the phosphorus source and amounts in water. To understand the phosphorus release process of bloom-forming cyanobacteria below the accumulated surface and sedimentary bloom-forming cyanobacteria, the degradation of bloom-forming cyanobacteria dominated by Microcystis spp. at different cell density in the dark was investigated over a 25-day microcosm experiment. The dissolved inorganic phosphorus (DIP) and dissolved total phosphorus (DTP) contents increased with the increment of cyanobacterial density, and the dark status markedly increased the proportion of DIP in water during the decline period of bloom-forming cyanobacteria. Meanwhile, the process of cyanobacterial apoptosis accompanied by the changes of malondialdehyde (MDA) and phosphatase (AKP) contents, and the increases of superoxide dismutase (SOD) and catalase (CAT) activities of cyanobacteria in the dark, especially in low-density groups (5.23×108 cells L-1), which further affect the physicochemical water parameters. Moreover, the DIP release from high-density cyanobacteria (7.86×107 cells L-1~5.23×108 cells L-1) resulted from the relative abundance of organophosphorus degrading bacteria in the dark. Therefore, the fast decay of cyanobacteria in the dark could accelerate DIP release, the high DIP release amount from accumulated bloom-cyanobacteria provide adequate P quickly for the sustained growth of cyanobacteria.

scholarly journals Effects of cyanobacterial-driven pH increases on sediment nutrient fluxes and coupled nitrification-denitrification in a shallow fresh water estuary

2012 ◽  
Vol 9 (7) ◽  
pp. 2697-2710 ◽  
Author(s):  
Y. Gao ◽  
J. C. Cornwell ◽  
D. K. Stoecker ◽  
M. S. Owens
Keyword(s):  
Oxygen Consumption ◽  
Pore Water ◽  
Soluble Reactive Phosphorus ◽  
Inorganic Phosphorus ◽  
Cyanobacterial Blooms ◽  
Ph Effects ◽  
Overlying Water ◽  
High Ph ◽  
Total Ammonium ◽  
Water Ecosystems

Abstract. Summer cyanobacterial blooms caused an elevation in pH (9 to ~10.5) that lasted for weeks in the shallow and tidal-fresh region of the Sassafras River, a tributary of Chesapeake Bay (USA). Elevated pH promoted desorption of sedimentary inorganic phosphorus and facilitated conversion of ammonium (NH4+) to ammonia (NH3). In this study, we investigated pH effects on exchangeable NH4+ desorption, pore water diffusion and the flux rates of NH4+, soluble reactive phosphorus (SRP) and nitrate (NO3−), nitrification, denitrification, and oxygen consumption. Elevated pH enhanced desorption of exchangeable NH4+ through NH3 formation from both pore water and adsorbed NH4+ pools. Progressive penetration of high pH from the overlying water into sediment promoted the mobility of SRP and the release of total ammonium (NH4+ and NH3) into the pore water. At elevated pH levels, high sediment-water effluxes of SRP and total ammonium were associated with reduction of nitrification, denitrification and oxygen consumption rates. Alkaline pH and the toxicity of NH3 may inhibit nitrification in the thin aerobic zone, simultaneously constraining coupled nitrification–denitrification with limited NO3− supply and high pH penetration into the anaerobic zone. Geochemical feedbacks to pH elevation, such as enhancement of dissolved nutrient effluxes and reduction in N2 loss via denitrification, may enhance the persistence of cyanobacterial blooms in shallow water ecosystems.

scholarly journals Effects of cyanobacterial-driven pH increases on sediment nutrient fluxes and coupled nitrification-denitrification in a shallow fresh water estuary

2012 ◽  
Vol 9 (1) ◽  
pp. 1161-1198 ◽  
Author(s):  
Y. Gao ◽  
J. C. Cornwell ◽  
D. K. Stoecker ◽  
M. S. Owens
Keyword(s):  
Oxygen Consumption ◽  
Pore Water ◽  
Soluble Reactive Phosphorus ◽  
Inorganic Phosphorus ◽  
Cyanobacterial Blooms ◽  
Ph Effects ◽  
Overlying Water ◽  
High Ph ◽  
Total Ammonium ◽  
Ph Elevation

Abstract. Summer cyanobacterial blooms caused an elevation in pH (9 to ~10.5) that lasted for weeks in the shallow and tidal-fresh region of the Sassafras River, a tributary of Chesapeake Bay (USA). Elevated pH promoted desorption of sedimentary inorganic phosphorus and facilitated conversion of ammonium (NH4+) to ammonia (NH3). In this study, we investigated pH effects on exchangeable NH4+ desorption, nutrient pore water diffusion and flux rates of NH4+, soluble reactive phosphorus (SRP), nitrate (NO3–), nitrification, denitrification, and oxygen consumption. pH elevation enhanced the desorption of exchangeable NH4+ because of NH3 formation from both pore water and adsorbed NH4+ pools. Progressive penetration of high pH from the overlying water into sediment promoted the release of SRP and total ammonium (NH4+ and NH3) into pore water. At elevated pH, high sediment-water effluxes of SRP and total ammonium were associated with reduction in nitrification, denitrification and oxygen consumption rates. Alkaline pH and the toxicity of NH3 may inhibit nitrification in the thin aerobic zone, simultaneously constraining coupled nitrification-denitrification with limited NO3– supply and high pH penetration into the anaerobic zone. Geochemical feedbacks to pH elevation, such as enhancement of dissolved nutrient effluxes and reduction in N2 loss via denitrification, may be responsible for the persistence of cyanobacterial blooms in shallow water ecosystems.

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