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Soluble and Plant Available Phosphorus in Acid Soils

Fransson, Ann-Mari LU (2000)
Abstract (Swedish)
Popular Abstract in Swedish

Växter kan tillgodogöra sig en större del av det fosfor som finns i marken än endast det som är mest lättillgängligt. De olika fosforformerna är starkt kopplade till varandra och om fosforn tycks fördela sig mellan dessa. Många extraherbara fosfor fraktioner är väl korrelerade till varandra. Hur mycket fosfor som är tillgängligt för växter är svårt att uppskatta, det varierar mellan olika jordar men olika arter kan även utnyttja fosforn i olika grad. Då fosfor tillförs sur skogsmark höjs markens totala fosforinnehåll och denna ökning kan detekteras efter så lång tid som 10 år efter den sista tillförseln även i lättlösliga fraktioner. Vi måste alltså även se till det fosfor som är potentiellt... (More)
Popular Abstract in Swedish

Växter kan tillgodogöra sig en större del av det fosfor som finns i marken än endast det som är mest lättillgängligt. De olika fosforformerna är starkt kopplade till varandra och om fosforn tycks fördela sig mellan dessa. Många extraherbara fosfor fraktioner är väl korrelerade till varandra. Hur mycket fosfor som är tillgängligt för växter är svårt att uppskatta, det varierar mellan olika jordar men olika arter kan även utnyttja fosforn i olika grad. Då fosfor tillförs sur skogsmark höjs markens totala fosforinnehåll och denna ökning kan detekteras efter så lång tid som 10 år efter den sista tillförseln även i lättlösliga fraktioner. Vi måste alltså även se till det fosfor som är potentiellt tillgängligt för att kunna bedöma en jords fosfor status. (Less)
Abstract
The P availability and solubility differ between soils and plants seem to have different ways of utilising the P present. The many P fractions present in soil interact and are closely related to another and transformations may easily occur. Due to this more P than the soluble fraction is available to plants. Different plant species utilise the P in soil differently; the relationship between the plant P concentration and the P content of the soil differs among species. More knowledge about plant responses to low P concentrations in soil, and on the replenishment rate of the soluble P pool is needed. Different processes and reactions might also be activated as P status changes, or if the major P pool changes. However, little is known in this... (More)
The P availability and solubility differ between soils and plants seem to have different ways of utilising the P present. The many P fractions present in soil interact and are closely related to another and transformations may easily occur. Due to this more P than the soluble fraction is available to plants. Different plant species utilise the P in soil differently; the relationship between the plant P concentration and the P content of the soil differs among species. More knowledge about plant responses to low P concentrations in soil, and on the replenishment rate of the soluble P pool is needed. Different processes and reactions might also be activated as P status changes, or if the major P pool changes. However, little is known in this field of research. To determine P solubility in a particular soil, P sorption, pH, P content, distribution of P, and organic matter composition need to be investigated. Another consequence of the close relationship between the P fractions in the soil is that added P is distributed over the soil P fractions and increases the soils overall P status including the most easily available P fractions. The effect of a P fertilisation can be detected long after fertilisation has ceased as increased easily extractable P determined with methods that is considered available to plants. In contrast addition of compounds that increase one particular P fraction of the soil, for example Ca, decreases the soluble P pool in the soil. If this build-up of Ca-phosphates decreases the potentially available fraction is however not certain, this depends on if the fraction formed is in equilibrium with the directly available, more soluble P. (Less)
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author
opponent
  • Dr Harrison, Antony, ITE. Merlewood Research Station, Grange-Over-Sands, U.K.
organization
publishing date
type
Thesis
publication status
published
subject
keywords
solubilisation mechanisms, Phosphorus extractions, Oxalate extraction, P fertilisation, Plant ecology, Växtekologi
pages
77 pages
publisher
Department of Ecology, Lund University
defense location
Blå Hallen Ecology Building
defense date
2000-01-28 10:00
external identifiers
  • Other:ISRN: SE-LundBDS/NBBE-00/1054+77pp
ISBN
91-7105-125-2
language
English
LU publication?
yes
id
136eedc2-b80a-4d3b-882f-e421c4b3fa73 (old id 40226)
date added to LUP
2007-07-31 08:44:42
date last changed
2016-09-19 08:45:05
@misc{136eedc2-b80a-4d3b-882f-e421c4b3fa73,
  abstract     = {The P availability and solubility differ between soils and plants seem to have different ways of utilising the P present. The many P fractions present in soil interact and are closely related to another and transformations may easily occur. Due to this more P than the soluble fraction is available to plants. Different plant species utilise the P in soil differently; the relationship between the plant P concentration and the P content of the soil differs among species. More knowledge about plant responses to low P concentrations in soil, and on the replenishment rate of the soluble P pool is needed. Different processes and reactions might also be activated as P status changes, or if the major P pool changes. However, little is known in this field of research. To determine P solubility in a particular soil, P sorption, pH, P content, distribution of P, and organic matter composition need to be investigated. Another consequence of the close relationship between the P fractions in the soil is that added P is distributed over the soil P fractions and increases the soils overall P status including the most easily available P fractions. The effect of a P fertilisation can be detected long after fertilisation has ceased as increased easily extractable P determined with methods that is considered available to plants. In contrast addition of compounds that increase one particular P fraction of the soil, for example Ca, decreases the soluble P pool in the soil. If this build-up of Ca-phosphates decreases the potentially available fraction is however not certain, this depends on if the fraction formed is in equilibrium with the directly available, more soluble P.},
  author       = {Fransson, Ann-Mari},
  isbn         = {91-7105-125-2},
  keyword      = {solubilisation mechanisms,Phosphorus extractions,Oxalate extraction,P fertilisation,Plant ecology,Växtekologi},
  language     = {eng},
  pages        = {77},
  publisher    = {ARRAY(0xafb9018)},
  title        = {Soluble and Plant Available Phosphorus in Acid Soils},
  year         = {2000},
}