A European Classification of Terrestrial Humus Forms - 1st Approach

A first approach towards an European system gives a general outline on characterisation of the diagnostic horizons and classification of humus forms in aerate conditions (four Mull, three Moder,two Mor humus forms). The question of humus form dynamics in space-time sequences is especially important and taken into account. Other open questions (the relation between the structure of the horizons and pedofauna, fungi and roots, humus forms characterized by dense rooting, by zoogenous and mycogenous influences) are discussed. Some propositions are expounded, according to recent field observations.