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Improved nutritional status of Cupressus lusitanica when grown adjacent to Pinus radiata

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We examined how a mixture of Pinus radiata D. Don and Cupressus lusitanica Mill. influences foliage element concentrations at 20 sites, covering a fertility gradient. Foliage element concentrations of plants at plot boundaries, where the two species grew adjacent to each other, were compared with those of plants at plot centres, where they were surrounded by plants of the same species. For C.lusitanica, plot position significantly affected nitrogen (N), phosphorus (P), and sulphur (S) with concentrations of these elements at the plot boundary exceeding concentrations at the plot centre by 10%–14%. For P. radiata, plants at the plot boundary had a significantly greater P concentration and lower N/P ratio than plants at the centre, but differences between positions were less than that for C. lusitanica (<7%). For C. lusitanica, the difference between foliage concentrations of N and P at the plot boundary and centre significantly declined as the mean plot concentrations of these elements increased. It is likely that C. lusitanica at the boundary benefited from the greater availability of N, P, and S in the root rhizosphere, where they were mobilized from soil organic matter by the ectomycorrhizae of P.radiata. We also suggest that P.radiata at the plot boundary may have benefited from mobilization of P by the endomycorrhizae of C. lusitanica.

Nous avons étudié de quelle façon un mélange de Pinus radiata D. Don et de Cupressus lusitanica Mill. influence la concentration foliaire des éléments le long d’un gradient de fertilité. La concentration foliaire des éléments dans les plants situés en bordure des placettes, où les deux espèces croissent l’une à côté de l’autre, a été comparée à la concentration foliaire des éléments dans les plants situés au centre des placettes, où ils sont entourés de plants de la même espèces. Dans le cas de C. lusitanica, la position dans la placette a significativement influencé les concentrations d’azote (N), de phosphore (P) et de soufre (S). La concentration de ces éléments était 10%– 14% plus élevée en bordure qu’au centre des placettes. Dans le cas de P. radiata, les plants situés en bordure des placettes avait une concentration de P significativement plus grande et un rapport N/P significativement plus faible que les plants situés au centre des placettes mais la différence entre les positions était plus faible (<7%) que dans le cas de C. lusitanica. Dans le cas de C. lusitanica, la différence de concentration en N et P entre la bordure et le centre des placettes diminuait de façon significative à mesure que la concentration moyenne de ces éléments dans l’ensemble de la placette augmentait. En bordure des placettes, C. lusitanica bénéficiait probablement de la plus grande disponibilité de N, P et S dans la rhizosphère, où ces éléments étaient mobilisés par les ectomycorhizes de P. radiata. Nous croyons également que P. radiata pourrait avoir bénéficié de la mobilisation de P par les endomycorhizes de C. lusitanica en bordure des placettes.

Document Type: Research Article

Publication date: 2009-04-01

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