Land use and soil development in Southern chile

Effects on physical properties

verfasst von

H. Fleige, S. Beck-Broichsitter, J. Dörner, M. O. Goebel, J. Bachmann, R. Horn

Abstract

Different physical properties of volcanic ash soils were investigated along a transect of 120 km from the western slope of the Central Cordilleras (40°20’S, 72°06’W) to the eastern slope of the Costal Cordillera (39°39’S, 73°11’W) in southern Chile with respect to the degree of soil development (Arenosol versus Andosol stage; Arenosol: young volcanic ash soil, free of clay, tephric properties, Andosol: older volcanic soil, clayey). The Andosols show a higher total pore volume and a higher field capacity, especially due to an increase in fine pores, than the Arenosols. Furthermore, the precompression stress (Pc) as a parameter for the mechanical soil strength is higher for Andosols despite of a lower bulk density. A land use (cropland, meadow, forest) dependent variation of the investigated parameters was less distinct for Andosols. A reduction of macropores and saturated hydraulic conductivity (ks) due to agriculture could be determined in the field, but in general the values are still on a high level with ks-values >100 cm d-1. However, at higher stresses using an oedometer test the ks-values of the Andosols are highly negatively affected with values <10 cm d-1. Aggregation is of major importance for soil stability of Andosols, whereas a homogenization of soil structure will lead to a distinct decrease of Pc of approx. 50%.

Organisationseinheit(en)

AG Bodenphysik
Institut für Bodenkunde

Externe Organisation(en)

Christian-Albrechts-Universität zu Kiel (CAU)
Universidad Austral de Chile

Typ

Artikel

Journal

Journal of Soil Science and Plant Nutrition

Band

16

Seiten

818-831

Anzahl der Seiten

14

ISSN

0718-9516

Publikationsdatum

09.2016

Publikationsstatus

Veröffentlicht

Peer-reviewed

Ja

ASJC Scopus Sachgebiete

Agronomie und Nutzpflanzenwissenschaften, Bodenkunde, Pflanzenkunde

Ziele für nachhaltige Entwicklung

SDG 15 – Lebensraum Land

Elektronische Version(en)

https://doi.org/10.4067/S0718-95162016005000058 (Zugang: Offen)