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Effects on soils of an oak invasion of a Calluna heath, Denmark, II. Changes in organic matter and cellulose decomposition / Knud Erik Nielsen in Geoderma, vol. 41, n°1-2 (Année 1987)

Public [article]  inGeoderma > vol. 41, n°1-2 (Année 1987) . - pp. 97-106 Titre : Effects on soils of an oak invasion of a Calluna heath, Denmark, II. Changes in organic matter and cellulose decomposition Type de document : texte imprimé Auteurs : Knud Erik Nielsen, Auteur ; Kristian Dalsgaard, Auteur ; Per Nørnberg, Auteur Année de publication : 1987 Article en page(s) : pp. 97-106 Langues : Anglais (eng) Catégories : [ZG] Danemark [habitats/milieux] 31 - Landes et fruticées [Thèmes] Relation sol - végétation Mots-clés : changement de végétation Résumé : "The investigation had two parts. In the first, organic matter was extracted from samples of the O through Bh horizons of seven profiles and then split into humic and fulvic acids. Part of the fulvic acid was treated with polyvinyl-pyrrolidone. In the other part, strips of cotton cloth were placed into the soils for two months, removed and tested for tensile strength to measure their decomposition. The amounts of humic and fulvic acids were both greater under Calluna than under the oaks. Profile distribution was also sharply contrasted under Calluna, being very low in the O horizons and high in the B horizons. Distribution was virtually uniform under the oak. The adsorption of fulvic acids by polyvinyl-pyrrolidone and the decomposition of the cotton strips indicated greater biological activity under the oaks than in the heath. These several differences are attributed to the replacement of one type of vegetation by another." (source : auteurs) Type de publication : périodique Référence biblio : Nielsen K., Dalsgaard K., Nørnberg P., 1987 - Effects on soils of an oak invasion of a Calluna heath, Denmark, II. Changes in organic matter and cellulose decomposition. Geoderma, 41 : 97-106. ID PMB : 70408 Permalink : http://www.cbnbrest.fr/catalogue_en_ligne/index.php?lvl=notice_display&id=70408 [article]

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• Effects on soils of an oak invasion of a Calluna heath, Denmark, I. Morphology and chemistry / Knud Erik Nielsen in Geoderma, vol. 41, n°1-2 (Année 1987)

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Effects on soils of an oak invasion of a Calluna heath, Denmark, I. Morphology and chemistry / Knud Erik Nielsen in Geoderma, vol. 41, n°1-2 (Année 1987)

Public [article]  inGeoderma > vol. 41, n°1-2 (Année 1987) . - pp. 79-95 Titre : Effects on soils of an oak invasion of a Calluna heath, Denmark, I. Morphology and chemistry Type de document : texte imprimé Auteurs : Knud Erik Nielsen, Auteur ; Kristian Dalsgaard, Auteur ; Per Nørnberg, Auteur Année de publication : 1987 Article en page(s) : pp. 79-95 Langues : Anglais (eng) Catégories : [habitats/milieux] 31 - Landes et fruticées [Espèces (in biblio)] Calluna [Thèmes] Relation sol - végétation Mots-clés : changement de végétation Résumé : "Where oak has been invading Hjerl Hede for the last century, four profiles were described and sampled for analyses in a trench extending into a Calluna stand from a pioneer oak about 70 years old. Three additional profiles were studied, one opposite to the oak, a second in another stand of Calluna and a third in an oak forest. Comparisons were then made of the morphology and chemistry of the profiles to identify early changes associated with the invasion. Principal differences attributed to the oak invasion were a marked reduction in the surface layer of organic matter and its conversion from mor to moder, a slight increase in pH of the uppermost horizons under the oak, slight changes in colours from black to brown in deeper horizons and the blurring of their boundaries. Amounts of iron extractable by pyrophosphate and tetraborate from the B horizons in the trench were smaller under the oak than under the Calluna." (source : auteurs) Type de publication : périodique Référence biblio : Nielsen K., Dalsgaard K., Nørnberg P., 1987 - Effects on soils of an oak invasion of a Calluna heath, Denmark, I. Morphology and chemistry. Geoderma, 41 : 79-95. ID PMB : 70409 Permalink : http://www.cbnbrest.fr/catalogue_en_ligne/index.php?lvl=notice_display&id=70409 [article]

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