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dc.contributor.author
Rey, Ana Lía
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dc.contributor.author
Oyonarte, Cecilio
dc.contributor.author
Morán López, Teresa
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dc.contributor.author
Raimundo, João
dc.contributor.author
Pegoraro, Emiliano
dc.date.available
2018-11-01T15:01:18Z
dc.date.issued
2017-02-01
dc.identifier.citation
Rey, Ana Lía; Oyonarte, Cecilio; Morán López, Teresa; Raimundo, João; Pegoraro, Emiliano; Changes in soil moisture predict soil carbon losses upon rewetting in a perennial semiarid steppe in SE Spain; Elsevier Science; Geoderma; 287; 1-2-2017; 135-146
dc.identifier.issn
0016-7061
dc.identifier.uri
http://hdl.handle.net/11336/63431
dc.description.abstract
Our understanding of the spatial and temporal dynamics of soil CO2 pulses after rainfall events is still limited and thus, our capacity to predict the consequences of future changes in precipitation patterns for dryland soils. In this study we examined the response of soil CO2 pulses to rainfall size and pre-rain soil moisture conditions in a semiarid grassland. In a first experiment, we manipulated the amount of rainfall in a factorial combination that included three levels of rainfall size (1, 5 and 15 mm), three soil covers: vegetated areas (VEG), biological soil crusts (BSC) and bare soil (BS) and two nearby sites: a natural grassland and a degraded grassland. We measured soil CO2 efflux over 24 h to capture rainfall pulses. In a second experiment conducted at the natural grassland, we measured soil CO2 efflux after manipulating soil moisture to its full range in the area by wetting the soil to: 0–10%, 10–15%, 20–25%, 30–35% water content levels. All soil covers responded to the rainfall treatments within minutes, reaching up to 120 times baseline values and shortly returning to background rates. Rainfall size had a larger impact on the response than pre-rain soil moisture conditions. Whereas in most cases rainfall amount increased soil CO2 pulses, initial moisture conditions did not affect total carbon losses despite much larger CO2 peaks in very dry soils. Interestingly, even extremely low rainfall events (1 mm) caused significant carbon losses. The amount of carbon lost after rainfall events ranged from 0.45 in bare soils to 1.18 g C m− 2 day− 1 in vegetated areas. Overall, rainfall had a larger impact in vegetated areas at the degraded site implying that larger carbon losses can be expected as a result of land degradation. Sudden changes in soil moisture caused by rainfall predicted 65% of total carbon losses in BS, 70% in BSC and 80% in VEG at both sites. However, the slope was significantly lower in bare soils suggesting substrate limitation. Since most of the carbon resides belowground in these grasslands, carbon losses as a result of larger rainfall events and longer dry periods in this area could have important consequences for soil carbon stocks.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Elsevier Science
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dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-nd/2.5/ar/
dc.subject
Biological Soil Crusts
dc.subject
Land Degradation
dc.subject
Rainfall Pulses
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Semiarid Perennial Grasslands
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Soil Carbon
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Soil Co2 Efflux
dc.subject
Stipa Tenacissima
dc.subject.classification
Otras Ciencias Biológicas
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dc.subject.classification
Ciencias Biológicas
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dc.subject.classification
CIENCIAS NATURALES Y EXACTAS
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dc.title
Changes in soil moisture predict soil carbon losses upon rewetting in a perennial semiarid steppe in SE Spain
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2018-10-23T16:15:50Z
dc.journal.volume
287
dc.journal.pagination
135-146
dc.journal.pais
Países Bajos
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dc.journal.ciudad
Amsterdam
dc.description.fil
Fil: Rey, Ana Lía. Consejo Superior de Investigaciones Cientificas. Museo Nacional de Ciencias Naturales; España
dc.description.fil
Fil: Oyonarte, Cecilio. Universidad de Almería; España
dc.description.fil
Fil: Morán López, Teresa. Consejo Superior de Investigaciones Cientificas. Museo Nacional de Ciencias Naturales; España. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte; Argentina
dc.description.fil
Fil: Raimundo, João. Universidad de Coimbra. Facultad de Ciencias E Tecnología. Departamento de Ciencias Da Vida; Portugal
dc.description.fil
Fil: Pegoraro, Emiliano. Consejo Superior de Investigaciones Cientificas. Museo Nacional de Ciencias Naturales; España
dc.journal.title
Geoderma
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dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1016/j.geoderma.2016.06.025
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S0016706116302750
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