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Root processes influencing phosphorus availability in volcanic soils under young Pinus radiata plantations

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Abstract:

Phosphorus (P) availability was investigated in rhizosphere soils under 4- to 5-year-old, second-rotation Pinus radiata D. Don and understorey grass (browntop, Agrostis capillaris L.) in two P-deficient Andosols (a Pumice Soil and an Allophanic Soil). Pinus radiata rhizosphere had more soil organic matter, greater mycorrhizal hyphal length density, higher acid phosphatase activity, and more concentrated dissolved organic carbon than bulk soil or the rhizosphere of grass species in one or both soils. Concentrations of resin P and organic P in the P. radiata rhizosphere were higher than those in the grass rhizosphere and bulk soils, suggesting that P. radiata rhizosphere processes have a greater potential to accumulate organic P and mobilize soil P than understorey grass rhizosphere processes. This effect was less marked in the Allophanic Soil than in the Pumice Soil, probably because of the higher P-fixing capacity and lower plant-available P concentrations in the Allophanic Soil.

La disponibilité du phosphore (P) a été étudiée dans la rhizosphère des sols sous une deuxième rotation de Pinus radiata D. Don âgés de quatre à cinq ans et un sous-étage d'herbacées (agrostide capillaire, Agrostis capillaris L.) dans deux andosols déficients en P (un sol ponceux et un sol allophanique). La rhizosphère de P. radiata avait plus de matière organique, une densité linéaire d'hyphes mycorhiziens plus élevée, une plus forte activité de la phosphatase acide et une plus grande concentration de carbone organique dissout que l'ensemble du sol ou que la rhizosphère de l'espèce d'herbacée dans un ou les deux sols. Les concentrations de P-résine et de P-organique dans la rhizosphère de P. radiata étaient plus élevées que dans la rhizosphère d'herbacées et que dans l'ensemble du sol, ce qui indique que les processus de la rhizosphère de P. radiata ont une plus grande capacité d'accumuler le P organique et de mobiliser le P du sol que les processus de la rhizosphère d'herbacées en sous-étage. Cet effet était moins marqué dans le sol allophanique que dans le sol ponceux, probablement à cause de la plus forte capacité de fixer P et des plus faibles concentrations de P disponible pour les plantes dans le sol allophanique.[Traduit par la Rédaction]

Document Type: Research Article

Publication date: August 1, 2006

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