Impact of ponderosa pine afforestations on soil organic matter (SOM) in semiarid steppes of western Patagonia, Argentina

Authors
Buduba, Carlos Guillermo; Defossé, Guillermo E.; Irisarri, Jorge A.
Publication Year
2017
Language
English
Format
article
Status
Published version
Description
The western steppe of Patagonia, Argentina, is being afforested with conifers since long ago. However, the effects of this land-use change on some soil parameters are still unknown. We determined soil organic matter (SOM) and root abundance at different soil depths, in 29 paired steppe-ponderosa pine (Pinus ponderosa Dougl. ex Laws.) stands planted at different times and densities between the 36°43′ and 44°8′S, and the 71°29′ and 70°35′W, in Patagonia, Argentina. SOM was significantly higher (p < 0.05) in steppe than in afforestations at upper soil horizons (0–30 cm soil depth), and similar at deeper depths. Soil OM was also higher in steppe as compared to sparse/young afforestation stands. Denser/older stands showed equal or slightly higher SOM values as compared to steppe. While root abundance was higher (p < 0.05) in afforestations than in steppe at all but in the superficial soil horizon, it has not yet significantly contributed to SOM formation. This study contributes to the understanding of how ponderosa pine afforestations, planted on a steppe of Patagonia, affect SOM, adding useful information for other areas of the world in which afforestations replace native vegetation.
EEA Esquel
Fil: Buduba, Carlos Guillermo. Centro de Investigación y Extensión Forestal Andino Patagónico; Argentina. Universidad Nacional de la Patagonia San Juan Bosco. Sede Esquel; Argentina. INTA. Estación Experimental Agropecuaria Esquel; Argentina
Fil: Defossé, Guillermo E. Centro de Investigación y Extensión Forestal Andino Patagónico; Argentina. Universidad Nacional de la Patagonia San Juan Bosco. Sede Esquel; Argentina
Fil: Irisarri, Jorge A. Universidad Nacional del Comahue. Facultad de Agronomía; Argentina
Source
Agroforestry systems 91 (5) : 895–900. (October 2017)
Subject
Pinus Ponderosa
Aforestación
Materia Orgánica del Suelo
Estepas
Afforestation
Soil Organic Matter
Steppes
Región Patagónica
Access level
Restricted access
License
Repository
INTA Digital (INTA)
Institution
Instituto Nacional de Tecnología Agropecuaria
OAI Identifier
oai:localhost:20.500.12123/2592