Details

Autor(en) / Beteiligte

• Raubuch, Markus
• Beese, Friedrich

Titel

Influence of soil acidity on depth gradients of microbial biomass in beech forest soils

Ist Teil von

• European journal of forest research, 2005-06, Vol.124 (2), p.87-93

Ort / Verlag

Dordrecht: Springer Nature B.V

Erscheinungsjahr

2005

Quelle

SpringerLink

Beschreibungen/Notizen

• The objectives of the study were to investigate mineral soil profiles as a living space for microbial decomposers and the relation of microbial properties to soil acidity. We estimated microbial biomass C on concentration (μg g^sup -1^ DW) as well as on volume basis (g m^sup -2^) and the microbial biomass C to soil organic C ratio along a vertical gradient from L horizon to 20 cm in the mineral soil and along a gradient of increasing acidity at five beech forest stands in Germany. Microbial biomass C concentration ranged from 17,000-34,000 μg C^sub mic^ g^sup -1^ DW in the litter layer and decreased dramatically down the profile to 29-264 μg C^sub mic^ g^sup -1^ DW at 15-20 cm depth in the mineral soil. This represents depth gradients of microbial biomass C concentrations ranging from a factor of 65 in slightly acidic and up to 875 in acidic soils. In contrast, microbial biomass C calculated on a volume basis (g C^sub mic^ m^sup -2^) showed a different pattern since a considerable part of the microbial biomass C was located in the mineral soils. In the soil profile 22-34% of the microbial biomass C was found in the mineral soil at strictly acidic sites and as much as 64-88% in slightly acidic soils. The microbial biomass C to soil organic carbon ratios decreased in general down from the L horizon in the forest floor to 0-5 cm depth in the mineral soils. In strongly acidic mineral soils however, the C to soil organic carbon ratio increased with depth, suggesting a positive relation to increasing pH. We conclude from depth gradients of soil pH and microbial biomass C to soil organic carbon ratio that pH affects this ratio at acidic sites. The inter-site comparison indicates that acidity restricts microbial biomass C in the mineral soils.[PUBLICATION ABSTRACT]