Résumé :
|
Drainage and agromeliorative management have a favorable effect on soil biota. In superaqueous landscapes, drainage and deep loosening of mineral soils are beneficial for increasing the total amount of algae, protozoa, and microorganisms and allowing them to penetrate into the deep horizons of the soil profile. The amount and biomass of worms and insects drastically decrease under the influence of drainage and deep meliorative loosening in combination with drainage. Deep loosening has an especially unfavorable effect on the total amount of young earthworms. In subaqueous landscapes, after removal of long-term flooding, it is drainage that exerts the main effect on the mesofauna population, and on the earthworm population in particular, in peat soils. It is demonstrated that the state of soil biota must be investigated with regard to the degree of soil wetting and heterogeneity (primary and secondary) of soil structure.
|