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Microbial biomass and respiratory activity in soil aggregates of different sizes from three beechwood sites on a basalt hill
Authors:S. Scheu  M. Maraun  M. Bonkowski  J. Alphei
Affiliation:(1) Ahteilung Ökologie, H. Zoologisches Institut, Berliner Straße 28, D-37073 Göttingen, Germany
Abstract:
We studied the effects of aggregates of different sizes on the soil microbial biomass. The distribution of aggregate size classes (<2, 2–4, 4–10, >10 mm) in the upper mineral soil horizon (Ah layer) was very different in three sites (upper, intermediate, lower) in a beechwood (Fagus sylvatica) on a basalt hill (Germany). Aggregates of different sizes (<2, 2–4, 4–10 mm) contained different amounts of C and N but the C:N ratios were similar. C and N contents were generally higher in smaller aggregates. The maximum initial respiratory response by microorganisms in intact aggregates and in aggregates passed through a 1-mm sieve declined with the aggregate size, but the difference was more pronounced in intact aggregates. Disruption of aggregates generally increased this response, particularly in 4- to 10-mm aggregates in the lower site. Basal respiration differed strongly among sites, but was similar in each of the aggregate size classes. Aggregate size did not significantly affect the specific respiration (mgrg O2 mgrg–1 microbial C h–1) nor the microbial: organic C ratio, but these parameters differed among sites. Microbial growth was increased strongly by passing the soil through a 1-mm sieve in each of the aggregate materials. The growth of microorganisms in disrupted aggregates was similar, and the effect of aggregate disruption depended on the growth of microorganisms in intact aggregates.
Keywords:Substrate-induced respiration  Microbial biomass  Beech forest  Soil aggregates  Aggregate disruption  Fagus sylvatica
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