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Communication à un Congrès (avec Actes)
M.C. Péres Hernández ; F.J. Gutiérrez Mañero ; J.M. Pozuelo González ; F. Bermúdez de Castro | Zaragoza [Espagne] : CIHEAM-IAMZ | Options Méditerranéennes : Série A. Séminaires Méditerranéens, ISSN 0253-1542 | 1989An annual acetylene-reducing activity (ARA) pattern in a riparian forest is determined. Free microorganisms, legumes and Alnus glutinosa shrubs and trees were measured in spring, summer, autumn and winter. The studied nitrogen-fixing systems pre[...]![]()
Communication à un Congrès (avec Actes)
A. Müller ; M.F. Schmitz ; F. Bermúdez de Castro | Zaragoza [Espagne] : CIHEAM-IAMZ | Options Méditerranéennes : Série A. Séminaires Méditerranéens, ISSN 0253-1542 | 1989The nitrogen fixation (ARA) of specimens of Lobaria pulmonaria growing on Quercus pyrenaica trunks in a mixed wood of beech and oak trees in Montejo de la Sierra (Madrid) is determined. The ARA was analysed monthly for a whole year and incubatio[...]![]()
Communication à un Congrès (avec Actes)
F. Gonzalez Bernaldez ; C. Montes | Zaragoza [Espagne] : CIHEAM-IAMZ | Options Méditerranéennes : Série A. Séminaires Méditerranéens, ISSN 0253-1542 | 1989Protected areas cannot be unlimited, being thus necessary to rationalise their constitution. For a long time nature conservation was based on the protection of outstanding endangered species. Later on, the interest expanded to the remaining orga[...]