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Leaf-nutrient accumulation and turnover at three stages of succession from heathland to forest / Michael Rode in Journal of Vegetation Science, vol. 4, n°2 (Année 1993)

Public [article]  inJournal of Vegetation Science > vol. 4, n°2 (Année 1993) . - pp. 263-268 Titre : Leaf-nutrient accumulation and turnover at three stages of succession from heathland to forest Type de document : texte imprimé Auteurs : Michael Rode, Auteur Année de publication : 1993 Article en page(s) : pp. 263-268 Langues : Anglais (eng) Catégories : [Espèces (in biblio)] Betula [Espèces (in biblio)] Calluna [Espèces (in biblio)] Fagus [Espèces (in biblio)] Pinus [Espèces (in biblio)] Quercus [Thèmes] Pédologie (sol) [Thèmes] Relation sol - végétation Mots-clés : apport nutritif  nutriment  changement de végétation Résumé : "Accumulation of nutrients in leaves of the dominating species of three ecosystems, characterizing the secondary succession from Genisto-Callunetum heathland through Leucobryo-Pinetum birch-pine woodland to mature Querco-Fagetum oak-beech forest, as well as nutrient turnover within these ecosystems was studied. The objective of the study was to establish potential variations in quantity and quality of nutrient supply to the plants with respect to succession dynamics. The results show very low leaf nutrient concentrations of all species investigated, coinciding with low nutrient availability in the soil. However, the nutrient content of leaves and leaf litter of Quercus petraea and Fagus sylvatica, which dominate the late succession stages, and in Betulapéndula are higher than in the photosynthetic organs (leaves and young shoots) of Calluna vulgaris and Pinus sylvestris. The combination of the higher nutrient content of the leaves and an increasing leaf-litter production during succession results in an increased nutrient turnover via leaf-litter fall. However, due to the high leaf biomass, the storage of nutrients in the leaf biomass is highest within the birch-pine woodland. From this, it may be assumed that the low demand and the low loss of nutrients via leaf-litter fall are favourable for Pinus at the early stages of forest succession on poor sandy soils. In contrast, Quercus and Fagus are provided with better growth conditions at the later stages of succession resulting from the accumulation of plant-available nutrients in the ecosystem by Pinus sylvestris, combined with a higher nutrient turnover as compared with the heathland." (source : auteur) Type de publication : périodique Référence biblio : Rode M., 1993 - Leaf-nutrient accumulation and turnover at three stages of succession from heathland to forest. Journal of Vegetation Science, 4 (2) : 263-268. ID PMB : 70410 Permalink : http://www.cbnbrest.fr/catalogue_en_ligne/index.php?lvl=notice_display&id=70410 [article]

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Resource availability at three presumed stages of a heathland succession on the Lüneburger Heide, Germany / Christoph Leuschner in Journal of Vegetation Science, vol. 4, n°2 (Année 1993)

Public [article]  inJournal of Vegetation Science > vol. 4, n°2 (Année 1993) . - pp. 255-262 Titre : Resource availability at three presumed stages of a heathland succession on the Lüneburger Heide, Germany Type de document : texte imprimé Auteurs : Christoph Leuschner, Auteur Année de publication : 1993 Article en page(s) : pp. 255-262 Langues : Anglais (eng) Catégories : [habitats/milieux] 31 - Landes et fruticées [habitats/milieux] 4 - Forêts [Espèces (in biblio)] Betula pendula [Espèces (in biblio)] Fagus sylvatica [Espèces (in biblio)] Pinus sylvestris [Espèces (in biblio)] Quercus petraea [Thèmes] Relation sol - végétation Mots-clés : changement de végétation  succession secondaire  potentiel sol-eau  nutriment Résumé : "The availability of maj or plant resources was investigated in three vegetation types that were assumed to represent different stages of a secondary succession on heathland on the Lüneburger Heide, northwestern Germany. Canopy transmission and absorption of photosynthetically active radiation (PAR), soil-water availability, and nutrient (Ca, K, Mg, N, P) availability were monitored with high spatial and temporal resolution in (1) a Calluna vulgaris heathland, (2) a pioneer birch-pine forest and (3) a late-successional oak-beech forest, situated close to each other on comparable geological substrate (diluvial). Mean fractional transmission of PAR during summer decreased from 0.48 in the heathland to 0.04 in the oak-beech forest while the fractional canopy absorption increased from 0.49 to 0.92. Soil-water availability as indicated by the soil-water potential, was significantly influenced by differential canopy interception loss and characteristic rooting patterns in the three vegetation types. Annual mean nutrient concentrations in the equilibrium soil solution were similar or, for some elements, increased from the heathland to the birch-pine and the oak-beech forest despite a growing demand. A marked increase was found for the total nutrient pools in the soil-organic layer between early and late successional vegetation types. On the poor glacial parent material, nutrient pools seem to be strongly dependent on stand productivity and litter production which increased with succession. Thus, for nutrients, facilitation seems to be important in this type of succession." (source : auteur) Type de publication : périodique Référence biblio : Leuschner C., 1993 - Resource availability at three presumed stages of a heathland succession on the Lüneburger Heide, Germany. Journal of Vegetation Science, 4 (2) : 255-262. ID PMB : 70411 DOI : 10.2307/3236112 Permalink : http://www.cbnbrest.fr/catalogue_en_ligne/index.php?lvl=notice_display&id=70411 [article]

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