Earth hummocks are small cryogenic mounds closely spaced in grassland or wetlands. The microtopography of hummocky terrain establish specific microclimatic conditions which may cause variations on soil chemico-physical properties and a selective distribution of plant species. The work has been carried out at the LTER site of Torgnon (Aosta Valley, Italy), characterized by a Nardus stricta subalpine hummocky grassland located at 2100 m. The concave-convex pattern shows a differentiated distribution of vegetation with the dominance of Nardus on hummocks and a prevalence of dicotyledons in interhummocks. Such distribution indicates variations in water and nutrient fluxes. In order to confirm this hypothesis, we collected topsoil samples and opened a soil pit. In addition, to investigate different litter decomposition rate, in relation to microtopography and plant species, litter bags were positioned in hummocks and interhummocks positions. The results verify a faster decomposition of dicotyledons in the nutrient-richer interhummocks topsoils compared to the podzolized hummocks positions, and an overall slower decomposition rate of Nardus litter.

Microtopography affects the relationship between soil, plant distribution and decomposition rates in a subalpine grassland / E. Pintaldi, C. Siniscalco, L. Celi, G. Filippa, M. Freppaz, E. Cremonese, E. Barni, M. Galvagno, M.E. D'Amico, U. Morra di Cella. ((Intervento presentato al convegno Perth III : Mountains of Our Future Earth tenutosi a Perth nel 2015.

Microtopography affects the relationship between soil, plant distribution and decomposition rates in a subalpine grassland

M. Freppaz;M.E. D'Amico;
2015

Abstract

Earth hummocks are small cryogenic mounds closely spaced in grassland or wetlands. The microtopography of hummocky terrain establish specific microclimatic conditions which may cause variations on soil chemico-physical properties and a selective distribution of plant species. The work has been carried out at the LTER site of Torgnon (Aosta Valley, Italy), characterized by a Nardus stricta subalpine hummocky grassland located at 2100 m. The concave-convex pattern shows a differentiated distribution of vegetation with the dominance of Nardus on hummocks and a prevalence of dicotyledons in interhummocks. Such distribution indicates variations in water and nutrient fluxes. In order to confirm this hypothesis, we collected topsoil samples and opened a soil pit. In addition, to investigate different litter decomposition rate, in relation to microtopography and plant species, litter bags were positioned in hummocks and interhummocks positions. The results verify a faster decomposition of dicotyledons in the nutrient-richer interhummocks topsoils compared to the podzolized hummocks positions, and an overall slower decomposition rate of Nardus litter.
Settore AGR/14 - Pedologia
Microtopography affects the relationship between soil, plant distribution and decomposition rates in a subalpine grassland / E. Pintaldi, C. Siniscalco, L. Celi, G. Filippa, M. Freppaz, E. Cremonese, E. Barni, M. Galvagno, M.E. D'Amico, U. Morra di Cella. ((Intervento presentato al convegno Perth III : Mountains of Our Future Earth tenutosi a Perth nel 2015.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/874605
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