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Résumé :
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Presents an interim report on a pilot project for the analysis of various aspects of ecosystems in the Solling forest, near Gottingen, with the emphasis on methods. Sample plots in Beech stands aged 60-120 years, Spruce stands aged 50-115 years, and grassland and arable land are being studied. Part 1, Primary production, includes papers on: CO2 gas exchange and transpiration in Beech; photosynthetically active leaf areas in Beech and Spruce; phenology of Beech and Spruce in relation to climate; structure and timber production of Beech and Spruce stands in relation to phenology and climate; estimation of the biomass of forests (especially Beech); distribution (by size and depth) of root-tips and tender roots of Beech; primary production of the ground vegetation of the Luzulo-Fagetum; chemical composition of plants of the field layer (in Beech stands at different seasons); papers on non-forest communities; and a paper on the determination of energy values (of the different vegetation types, their chief components and the seasonal variations of energy values). Part 2, Secondary production, includes papers on: food, population dynamics and energy turnover of leaf-eating insects and other phytophagous or predatory arthropods, and their influence on primary production in Beech stands; the abundance of bacteria and other micro-organisms in Beech and grassland soils, and microbial transformation of organic material in the soil of Beech and Spruce stands (cellulose, lignin, amino acids, enzymes, tannins, and chlorophyll). Part 3, Environmental conditions, includes papers on: measurement of climatic elements; characterization of the woodland light climate; micromorphology of humus and soil; chemical differences between Beech and Spruce sites; the content and production of mineral N in soils of different vegetation types, with special reference to vertical distribution in Beech woods; and a paper on soil water, noticed separately. Part 4, Range of validity of the results, includes a paper on phenological comparisons of the forest research area in the Solling with similar forests in other mountain ranges
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