[en] Seasonal variations of mycorrhizal colonisation of European beech, Fagus sylvatica L. and Norway spruce, Picea abies Karst., rootlets in two stands, were investigated by comparing ergosterol content and very-fine root tip counts for a 3 yr period. Significant correlations and interactions between three environmental factors, ‘year’, ‘season’ and ‘horizon’ and the measured data, were interpreted. It was shown that root tip counting together with ergosterol analysis of rootlets enables us to follow changes induced by the environment on a long-term basis.
Alexander, Fairley (1986) Growth and nitrogen uptake rates of ectomycorrhizae spruce seedlings. Proceedings of 1st European Symposium on Mycorrhiza , V. Gianinazzi-Pearson, S. Gianinazzi, Dijon, Physiological and Genetical Aspects of Mycorrhizae, INRA, Paris; 377-382.
Blechschmidt-Schneider (1989) Phloembeladung bei Picea. Physiologische Betrachtungen. Kali-Briefe (Büntehof) 19:467-489.
Dagnelie (1956) Recherches sur la productivité des hêtraies de l'Ardenne en relation avec les types phytosociologiques et les facteurs écologiques (I). Bulletin Institut Agronomique Station Recherches Gembloux 24:369-410.
Hannick, Waterkeyn, Weissen, van Praag (1993) Morphological changes in vascular tissue of Norway spruce needles and twigs in relation to magnesium deficiency. Tree Physiology 13:337-349.
Harley The Biology of Mycorrhiza, Leonard Hill, London; 1959.
Hüttl, Fink (1988) Diagnostische Düngungsversuche zur Revitalisierung geschädigter Fichtenbestände (Picea abies Karst) in Südwestdeutschland. Forstwissenschaftliches Centralblatt 107:173-183.
Johnson, McGill (1990) Comparison of ergosterol and chitin as qualitative estimates of mycorrhizal infection and Pinus contorta seedling response to inoculation. Canadian Journal of Forest Research 20:1125-1131.
Manil, Ledant, van Praag, Manil (1977) Distribution des racines fines dans les sites forestiers de Mirwart. Productivité biologique en Belgique , P. Duvigneaud, P. Kestemont, SCOPE, Belgique, (Programme Biologique International).; 191-198.
Plassard, Coll, Mousain, Colson (1988) Estimation quantitative de l'infection ectomycorhizienne du pin maritime Pinus pinaster Aiton en pépinière. Acta Ecologica-Oecologia Plantarum 9:381-391.
van Praag, Sougnez-Remy, Weissen, Carletti (1988) Root turnover in a beech and a spruce stand of the Belgian Ardennes. Plant and Soil 105:87-103.
Umweltforschung zu Waldshääen , Report, Der Bundesminister für Forschung und Technologie Öffentlichkeits-arbeit, Neue Presse Verlagsgesellschaft mbH, Passau, Bonn; 1985, 1-79.
Ritter, Weber, Kottke, Oberwinkler (1989) Zur Mykorrhizaentwicklung von Fichten und Tannen in geschädigten Beständen. Biologie in unserer Zeit 19. Jahrg. 1989, Nr l VCH Verlagsgesellschaft gmbH, D-6940 Weinheim; .
Salmonowicz, Nylund (1988) High performance liquid chromatography determination of ergosterol as a measure of ectomycorrhizal infection in Scots pine. Forest Pathology 18:291-298.
Schmitt, Ruetze (1989) The sieve cells in spruce needles. Indicators of a disorder in assimilate translocation. Angewandte Botanik 63:525-532.
Thill, Palm (1976) Production de l'épicéa commun dans le sud-ouest de l'Ardenne Belge. Note Technique No. 28 , Centre d'Economie Forestière (IRSIA), Gembloux; 42.
Wallander, Nylund (1991) Effects of excess nitrogen on carbohydrate concentrations and mycorrhizal development of Pinus sylvestris L. seedlings. New Phylology 119:405-411.
Weissen, Marechal (1991) Le sol, un composant stabilisateur de l'écosystème forestier ardennais. Pédologie 46:69-87.
Weissen, Hambuckers, van Praag, Remade (1990) A decennial control of N-cycle in the Belgian Ardenne forest ecosystems. Plant and Soil 128:59-66.