期刊
PEDOBIOLOGIA
卷 55, 期 2, 页码 101-110出版社
ELSEVIER GMBH
DOI: 10.1016/j.pedobi.2011.12.002
关键词
Soil enzymes; MicroResp-CLPP; Aggregates; POM; Particle size fractions
资金
- MIUR, FISR
Chemical and functional characterizations of particle-size and aggregate fractions of soils were performed to investigate whether accessibility and decomposability of organic matter regulate functions and diversity of the soil microbial community at the micro-habitat scale. Soils were physically fractionated into particle size fractions, free-particulate organic matter (F-POM), macro-aggregates (250-2000 mu m) and micro-aggregates (53-250 mu m). Organic C was enriched in silt and clay, micro-aggregates and F-POM fractions. Enzymes showed the greatest activity in the fine fractions (silt and clay) and F-POM, and were largely influenced by organic C content. MicroResp-CLPP (Community Level Physiological Profile) showed the lowest catabolic responses in the sand and the highest in the fine fraction and micro-aggregates. In general, organic C availability drove soil activity and functional diversity: soils with the higher amount of organic C showed the higher catabolic activity. However, this response was variable within soil fractions. where organic C accessibility, as well as microbial selection and distribution, affected functional diversity. (c) 2011 Elsevier GmbH. All rights reserved.
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