کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
2061101 1076435 2012 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Soil organic carbon distribution drives microbial activity and functional diversity in particle and aggregate-size fractions
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم کشاورزی و بیولوژیک علوم دامی و جانورشناسی
پیش نمایش صفحه اول مقاله
Soil organic carbon distribution drives microbial activity and functional diversity in particle and aggregate-size fractions
چکیده انگلیسی

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 μm) and micro-aggregates (53–250 μm). 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.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Pedobiologia - Volume 55, Issue 2, 10 March 2012, Pages 101–110
نویسندگان
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