Microbial biomass content, basal respiration and enzyme activities during the course of decomposition of leaf litter in a black alder (Alnus glutinosa (L.) Gaertn.) forest

alemania allemagne alnus glutinosa biologie du sol biomasa biomass biomasse contenido de agua en el suelo crop residues degradation enzimas enzyme enzymes forest litter germany hojarasca hojarasca forestal microorganisme microorganismos microorganisms peat soils plant litter residuos de cosechas soil soil biology soil morphological features soil water content sol sol tourbeux suelo suelo turboso teneur en eau du sol trait morphologique du sol