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hal.structure.identifierAgrosystèmes Cultivés et Herbagers [ARCHE]
dc.contributor.authorSTROIA, Marcel Ciprian
hal.structure.identifierInteractions Sol Plante Atmosphère [UMR ISPA]
dc.contributor.authorMOREL, Christian
hal.structure.identifierAgrosystèmes Cultivés et Herbagers [ARCHE]
dc.contributor.authorJOUANY, Claire
dc.date.accessioned2024-04-08T11:58:00Z
dc.date.available2024-04-08T11:58:00Z
dc.date.issued2005
dc.date.conference2005-09-24
dc.identifier.urihttps://oskar-bordeaux.fr/handle/20.500.12278/195896
dc.description.abstractEnThis work aimed to test the ability of laboratory experiments to predict long term changes in plant-available soil P in two grassland experiments carried out on a Luvisol (Ercé, French Pyrenees) and a Brunisol (Gramond, Massif Central, central France) since 1999 and 1998, respectively. Each experiment consisted of two annual rates of N and P fertilization arranged in four randomised blocks. Dry matter yields and P contents were measured for each cut, and P off-take and P balance were calculated every year and accumulated over years of experimentation. The ionic P concentration in solution (Cp) was also determined almost every year for both sites. Results showed that a close linear correlation existed between Cp values and the cumulative P balance. Plant-available P was assessed in laboratory experiments (soil suspension (1 g:10 mL) at steady-state) as the sum of the amount of P ions in soil solution (Pw) plus the associated gross amount (Pr) of P ions bound to the soil solid phase that buffers the soil solution P by diffusion over time (t). The Pw values were calculated by multiplying the P ion concentration in solution (Cp) by the volume/mass ratio. The isotopic labelling of P ions in solution and the dilution principle were used to determine Pr values. The dynamics of Pr versus (Cp, t) was accurately described by the Freundlich kinetic equation (Pr = , with Pr < total mineral P). The Pr values were greater for the Luvisol than for the Brunisol. This behaviour was mainly ascribed to differences in Al- and Fe-(hydr) oxide contents, which were 545 and 117 mmol kg−1 for the Luvisol and Brunisol, respectively. The (Pw + Pr) values were used with the mass conservation law to calculate the change in Cp per unit of P balance (ΔCp) assuming different time scenarios. For the Luvisol, the field and laboratory ΔCp values did not vary significantly, but a mismatch was observed for the Brunisol and this is discussed. Finally, the approach seems promising to elaborate a mechanism- and process-oriented modelling of the changes in plant-available P with management practices in grassland soils.
dc.language.isoen
dc.subject.engrassland
dc.subject.ensoil phosphorus
dc.subject.enbioavailability
dc.subject.enmineral fertilization
dc.subject.enlong-term change
dc.subject.enphosphorus balance
dc.subject.en32p isotopic dilution
dc.subject.enrestoration
dc.title.enDynamic of diffusive soil phosphorus in two grassland experiments determined in field and laboratory conditions
dc.typeCommunication dans un congrès
dc.subject.halSciences du Vivant [q-bio]
dc.subject.halSciences de l'Homme et Société
dc.subject.halSciences de l'environnement
bordeaux.hal.laboratoriesInteractions Soil Plant Atmosphere (ISPA) - UMR 1391*
bordeaux.institutionBordeaux Sciences Agro
bordeaux.institutionINRAE
bordeaux.conference.titleCOST 629 Training School, Biogeochemical Dynamics From Soil to Groundwater
bordeaux.countryES
bordeaux.conference.cityMalaga
bordeaux.peerReviewedoui
hal.identifierhal-02760018
hal.version1
hal.invitednon
hal.conference.end2005-10-01
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-02760018v1
bordeaux.COinSctx_ver=Z39.88-2004&amp;rft_val_fmt=info:ofi/fmt:kev:mtx:journal&amp;rft.date=2005&amp;rft.au=STROIA,%20Marcel%20Ciprian&amp;MOREL,%20Christian&amp;JOUANY,%20Claire&amp;rft.genre=unknown


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