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Soil macroaggregate dynamics in a mountain spatial climate gradient

By Lauric Cécillon, Nilvania A. De Mello, Sébastien De Danieli, Jean-jacques Brun and Key Words


– “The original publication is available at” We investigated the response of soil macroaggregate dynamics to soil temperature modification along a spatial gradient located on a forested north-facing slope in the southern French Alps, simulating long-term adjustment of soil-plant interactions to absence or occurrence of soil frost. Soil macroaggregate (> 250 µm) content of Ah horizons was strongly depleted (72%) in colder plots affected by freeze-thaw events, compared to 96 % in warmer and frost-free plots (p < 0.05). A visual assessment of soil macroaggregation showed that physical processes hal-00397057, version 3- 23 Jan 2010 were the main drivers of soil macroaggregation in colder plots, with 66 % of the 5–12.5 mm fraction and the whole 3.15–5 mm fraction. Conversely, we found a balanced contribution of biological and physical aggregation pathways in warmer plots. All identified macroaggregate types could be classified, depending on their organic matter (OM) quality, using principal component analyses of their near infrared spectra. Such spectral classifications indicated temporal changes in OM quality of macroaggregates, from formation to colonization by fin

Topics: Mountain soils, Climate change, Soil aggregation, Soil organic matter, Near infrared reflectance spectroscopy, Soil threats
Year: 2010
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