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Dynamic of diffusive soil phosphorus in two grassland experiments determined in field and laboratory conditions
| hal.structure.identifier | Agrosystèmes Cultivés et Herbagers [ARCHE] | |
| dc.contributor.author | STROIA, Marcel Ciprian | |
| hal.structure.identifier | Interactions Sol Plante Atmosphère [UMR ISPA] | |
| dc.contributor.author | MOREL, Christian | |
| hal.structure.identifier | Agrosystèmes Cultivés et Herbagers [ARCHE] | |
| dc.contributor.author | JOUANY, Claire | |
| dc.date.accessioned | 2024-04-08T11:58:00Z | |
| dc.date.available | 2024-04-08T11:58:00Z | |
| dc.date.issued | 2005 | |
| dc.date.conference | 2005-09-24 | |
| dc.identifier.uri | https://oskar-bordeaux.fr/handle/20.500.12278/195896 | |
| dc.description.abstractEn | This 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.iso | en | |
| dc.subject.en | grassland | |
| dc.subject.en | soil phosphorus | |
| dc.subject.en | bioavailability | |
| dc.subject.en | mineral fertilization | |
| dc.subject.en | long-term change | |
| dc.subject.en | phosphorus balance | |
| dc.subject.en | 32p isotopic dilution | |
| dc.subject.en | restoration | |
| dc.title.en | Dynamic of diffusive soil phosphorus in two grassland experiments determined in field and laboratory conditions | |
| dc.type | Communication dans un congrès | |
| dc.subject.hal | Sciences du Vivant [q-bio] | |
| dc.subject.hal | Sciences de l'Homme et Société | |
| dc.subject.hal | Sciences de l'environnement | |
| bordeaux.hal.laboratories | Interactions Soil Plant Atmosphere (ISPA) - UMR 1391 | * |
| bordeaux.institution | Bordeaux Sciences Agro | |
| bordeaux.institution | INRAE | |
| bordeaux.conference.title | COST 629 Training School, Biogeochemical Dynamics From Soil to Groundwater | |
| bordeaux.country | ES | |
| bordeaux.conference.city | Malaga | |
| bordeaux.peerReviewed | oui | |
| hal.identifier | hal-02760018 | |
| hal.version | 1 | |
| hal.invited | non | |
| hal.conference.end | 2005-10-01 | |
| hal.popular | non | |
| hal.audience | Internationale | |
| hal.origin.link | https://hal.archives-ouvertes.fr//hal-02760018v1 | |
| bordeaux.COinS | ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.date=2005&rft.au=STROIA,%20Marcel%20Ciprian&MOREL,%20Christian&JOUANY,%20Claire&rft.genre=unknown |
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