| Title | Soil organic carbon distribution drives microbial activity and functional diversity in particle and aggregate-size fractions |
| Publication Type | Journal Article |
| Year of Publication | 2012 |
| Authors | Lagomarsino A., Grego S., Kandeler E. |
| Journal | Pedobiologia |
| Volume | 55 |
| Pagination | 101-110 |
| Date Published | 2012/03/10/ |
| ISBN Number | 0031-4056 |
| Keywords | Aggregates, microresp-clpp, Particle size fractions, POM, Soil enzymes |
| Abstract | 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 (250–2000μm) and micro-aggregates (53–250μm). 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.
|
| Short Title | Pedobiologia |
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