Short Rotation Plantations in Central Europe. Nutrition and Influences on Soil Factors

1990

5 Abb., 5 Lit. Ang.

Unselbständiges Werk

9087

200085625

A short-rotation experiment with 4 poplar and willow clones was established 1983 as part of an integrated project in north-eastern Bavaria/FRG. After 5 years, balsam poplars and aspen showed an accumulation average shoot biomass (without leaves) of 27-30 t DM/ha, while Salix viminalis had produced 20 t. Production on wet soils was lower than that on the well-drained sites. Fertilization with N increased the biomass production of balsam poplars and Salix only during the 5th growing season, while fertilization with P, K and Mg did not cause any significant growth effect. Comparative analyses of soil samples from 1983 and 1986 did not reveal any significant changes of soil chemical properties. The concentrations of NH4-+NO3-N in the soil solution decreased between 1984 and 1987. Changing from agricultural to forest management resulted in a significant increase of earthworms (Lumbricidae), harvestmen (Opilionida) and woodlice (Isopoda), and a higher diversity of the ground vegetation.