Soil respiration across a disturbance gradient in sclerophyllous ecosystems in Central Chile

Sclerophyllous shrubs and forests are predominant in semiarid Central Chile and have a long history of degradation by fire, cultivation, firewood extraction and grazing. The aim of this study was to compare the amount and environmental drivers of soil respiration across a disturbance gradient in scl...

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Autores principales:	Bown,Horacio E, Fuentes,Juan-Pablo, Perez-Quezada,Jorge F, Franck,Nicolás
Lenguaje:	English
Publicado:	Pontificia Universidad Católica de Chile. Facultad de Agronomía e Ingeniería Forestal 2014
Materias:	Acacia caven savanna disturbance gradient sclerophyllous forest soil respiration thorn scrub
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202014000100009
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spelling	oai:scielo:S0718-162020140001000092014-10-10Soil respiration across a disturbance gradient in sclerophyllous ecosystems in Central ChileBown,Horacio EFuentes,Juan-PabloPerez-Quezada,Jorge FFranck,Nicolás Acacia caven savanna disturbance gradient sclerophyllous forest soil respiration thorn scrub Sclerophyllous shrubs and forests are predominant in semiarid Central Chile and have a long history of degradation by fire, cultivation, firewood extraction and grazing. The aim of this study was to compare the amount and environmental drivers of soil respiration across a disturbance gradient in sclerophyllous ecosystems in the National Reserve Roblería del Cobre de Loncha in Central Chile. In a north-facing toe slope, four disturbance conditions were identified: slightly (D1) and moderately disturbed (D2) sclerophyllous forest, (D3) strongly disturbed thorn scrub and (D4) most disturbed A. caven savanna. Twelve 25×25-m plots (625 m²) were distributed equally across D1, D2, D3 and D4. Soil respiration (Rs), soil temperature (Ts), volumetric water content (θv) and exchangeable nitrogen (Ns) were measured at six dates in each plot between August 2009 and May 2010. Additionally, Ts and θv were continuously recorded from July 2010 to August 2012 (30-minute intervals) in one plot per disturbance condition (i.e., 4 out of 12 plots). The values of Rs increased linearly with θv with similar slopes but different intercepts, which increased as the disturbance receded. Once soil water content was taken into account, Rs increased with Ts with the same slope but with a disturbance-dependent intercept. Additionally, the response of Rs to Ts was more pronounced as θv increased. The values of Ns were uncorrelated with Rs. The annual values of Rs were 4.4-fold greater in D1 (1,735 g C m-2 yr-1) compared with D4 (392 g C m-2 yr-1). Disturbance presumably decreased Rs by reducing the litter layer, soil organic matter, root biomass and soil water content, particularly in the hot-dry season. Under a predicted climate change scenario of a 40% decrease in rainfall and 4°C increase in air temperature by the year 2100, we found that annual Rs would be reduced on average by 28% compared with the current climate, with that reduction being more pronounced under more disturbed conditions, suggesting that less disturbed conditions would be more resistant to climate change, thus further justifying the restoration of these damaged ecosystems.info:eu-repo/semantics/openAccessPontificia Universidad Católica de Chile. Facultad de Agronomía e Ingeniería ForestalCiencia e investigación agraria v.41 n.1 20142014-04-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202014000100009en10.4067/S0718-16202014000100009
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Acacia caven savanna disturbance gradient sclerophyllous forest soil respiration thorn scrub
spellingShingle	Acacia caven savanna disturbance gradient sclerophyllous forest soil respiration thorn scrub Bown,Horacio E Fuentes,Juan-Pablo Perez-Quezada,Jorge F Franck,Nicolás Soil respiration across a disturbance gradient in sclerophyllous ecosystems in Central Chile
description	Sclerophyllous shrubs and forests are predominant in semiarid Central Chile and have a long history of degradation by fire, cultivation, firewood extraction and grazing. The aim of this study was to compare the amount and environmental drivers of soil respiration across a disturbance gradient in sclerophyllous ecosystems in the National Reserve Roblería del Cobre de Loncha in Central Chile. In a north-facing toe slope, four disturbance conditions were identified: slightly (D1) and moderately disturbed (D2) sclerophyllous forest, (D3) strongly disturbed thorn scrub and (D4) most disturbed A. caven savanna. Twelve 25×25-m plots (625 m²) were distributed equally across D1, D2, D3 and D4. Soil respiration (Rs), soil temperature (Ts), volumetric water content (θv) and exchangeable nitrogen (Ns) were measured at six dates in each plot between August 2009 and May 2010. Additionally, Ts and θv were continuously recorded from July 2010 to August 2012 (30-minute intervals) in one plot per disturbance condition (i.e., 4 out of 12 plots). The values of Rs increased linearly with θv with similar slopes but different intercepts, which increased as the disturbance receded. Once soil water content was taken into account, Rs increased with Ts with the same slope but with a disturbance-dependent intercept. Additionally, the response of Rs to Ts was more pronounced as θv increased. The values of Ns were uncorrelated with Rs. The annual values of Rs were 4.4-fold greater in D1 (1,735 g C m-2 yr-1) compared with D4 (392 g C m-2 yr-1). Disturbance presumably decreased Rs by reducing the litter layer, soil organic matter, root biomass and soil water content, particularly in the hot-dry season. Under a predicted climate change scenario of a 40% decrease in rainfall and 4°C increase in air temperature by the year 2100, we found that annual Rs would be reduced on average by 28% compared with the current climate, with that reduction being more pronounced under more disturbed conditions, suggesting that less disturbed conditions would be more resistant to climate change, thus further justifying the restoration of these damaged ecosystems.
author	Bown,Horacio E Fuentes,Juan-Pablo Perez-Quezada,Jorge F Franck,Nicolás
author_facet	Bown,Horacio E Fuentes,Juan-Pablo Perez-Quezada,Jorge F Franck,Nicolás
author_sort	Bown,Horacio E
title	Soil respiration across a disturbance gradient in sclerophyllous ecosystems in Central Chile
title_short	Soil respiration across a disturbance gradient in sclerophyllous ecosystems in Central Chile
title_full	Soil respiration across a disturbance gradient in sclerophyllous ecosystems in Central Chile
title_fullStr	Soil respiration across a disturbance gradient in sclerophyllous ecosystems in Central Chile
title_full_unstemmed	Soil respiration across a disturbance gradient in sclerophyllous ecosystems in Central Chile
title_sort	soil respiration across a disturbance gradient in sclerophyllous ecosystems in central chile
publisher	Pontificia Universidad Católica de Chile. Facultad de Agronomía e Ingeniería Forestal
publishDate	2014
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202014000100009
work_keys_str_mv	AT bownhoracioe soilrespirationacrossadisturbancegradientinsclerophyllousecosystemsincentralchile AT fuentesjuanpablo soilrespirationacrossadisturbancegradientinsclerophyllousecosystemsincentralchile AT perezquezadajorgef soilrespirationacrossadisturbancegradientinsclerophyllousecosystemsincentralchile AT francknicolas soilrespirationacrossadisturbancegradientinsclerophyllousecosystemsincentralchile
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Soil respiration across a disturbance gradient in sclerophyllous ecosystems in Central Chile

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