Land-Use-Dependent Change in the Soil Mechanical Strength and Resilience of a Shallow Volcanic Ash Soil in Southern Chile

Dörner, José, Horn, Rainer, Dec, Dorota, Wendroth, Ole, Fleige, Heiner and Zúñiga, Felipe (2017) Land-Use-Dependent Change in the Soil Mechanical Strength and Resilience of a Shallow Volcanic Ash Soil in Southern Chile Soil Science Society of America Journal, 81 (5). p. 1064. DOI 10.2136/sssaj2016.11.0378.

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Abstract

Aquands are shallow volcanic ash soils, locally called Ñadi, which cover an area of 475,000 hectares in Chile and have undergone intensive land use changes from secondary native forest (sNF) to naturalized grasslands (NG). This study analyzed the impact of the land use change of a Ñadi soil on the spatial changes of their mechanical strength and its consequences on pore functions and soil resilience. The land use change from sNF to NG occurred in 1980 due to a forest fire. We measured the volumetric water content and penetration resistance between 0-10 cm depths at 98 grid points across the domain (sNF and NG). Near each grid point, undisturbed soil core samples were collected to measure soil pre-compression stress (Pc), soil resilience after the application of mechanical stresses and water saturation by capillary rise and the changes in air permeability (ka). After the application of mechanical stresses (to 400 kPa), the soil presented a land-use-dependent soil deformation and a limited, spatially variable soil resilience, which homogenized the ka across the field. Despite a bulk density of 0.65 g/cm3, these soils must be described as highly compacted and defined by high soil mechanical strength (Pc > 60 kPa) with small values of air capacity (< 8%) and permeability (< 1 log μm2). In order to design proper schemes for land use planning of these specific soils further analyses are required as the definition of a minimal Ñadi soil depth to support a productive system without detrimental effects on their ecosystem services.

Document Type: Article
Research affiliation: Kiel University > Kiel Marine Science
OceanRep > The Future Ocean - Cluster of Excellence
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Refereed: Yes
DOI etc.: 10.2136/sssaj2016.11.0378
ISSN: 0361-5995
Date Deposited: 18 Jan 2018 11:12
Last Modified: 01 Feb 2018 07:08
URI: http://eprints.uni-kiel.de/id/eprint/41619

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