Suchergebnisse

The present study deals with the productivity and photo-synthetic efficiency of a beechwood located in the belgian "Haute-Ardenne" ; this stand has an estimated dry biomass of 343 t/ha. The ecological productivity reachs 11,59 t/ha/year and the photosynthetic efficiency is 2,34 % according to the total radiant energy during the effective assimilation period. In connection with the total amount of radiant energy recorded throughout the year, the photosynthetic efficiency is only 1,18 %.

Structure, dendrologie features and biomass of a 120 years old beechwood (Luzulo-Fagetum) have been studied during August 1966 at the « Plateau des Tailles » (Ardenne belge — 595 m above sea level). Ground vegetation is fairly well developed and its coverage is 89 % of the area ; canopy coverage reachs 68 %. Beech seedlings present a low vitality. The total dry biomass is 343 t/ha with a water content of 254 t/ha. On the whole, the herb layer contribution is 3,5 % of the dry biomass, while stocks and roots of trees stand for 18,6%.