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dc.contributor.authorLázaro, Roberto
dc.contributor.authorCalvo-Cases, Adolfo
dc.contributor.authorRodriguez-Caballero, Emilio
dc.contributor.authorArnau-Rosalén, Eva
dc.contributor.authorAlexander, Roy
dc.contributor.authorRubio, Consuelo
dc.contributor.authorCantón, Yolanda
dc.contributor.authorSolé-Benet, Albert
dc.contributor.authorPuigdefábregas, Juan
dc.date.accessioned2021-12-08T09:12:05Z
dc.date.available2021-12-08T09:12:05Z
dc.date.issued2021-10-15
dc.identifierhttps://chesterrep.openrepository.com/bitstream/handle/10034/626548/Biocrusts%20and%20catchment%20asymmetry.pdf?sequence=5
dc.identifierhttps://chesterrep.openrepository.com/bitstream/handle/10034/626548/Figures%201-9.pdf?sequence=2
dc.identifier.citationLázaro, R., Calvo-Cases, A., Rodriguez-Caballero, E., Arnau-Rosalén, E., Alexander, R., Rubio, C., Cantøn, Y, Solé-Benet, A & Puigdefábregas, J. (2022). Biocrusts and catchment asymmetry in Tabernas Desert (Almeria, Spain). Geoderma, 406, 115526. https://doi.org/10.1016/j.geoderma.2021.115526.en_US
dc.identifier.issn0016-7061
dc.identifier.doi10.1016/j.geoderma.2021.115526
dc.identifier.urihttp://hdl.handle.net/10034/626548
dc.description.abstractCatchment asymmetry is a fairly frequent phenomenon on a global scale but the main causes leading to its formation are still not well understood. Where the intervention of structural or tectonic causes is not relevant, asymmetry seems to result from differential erosion between opposite slopes that flow into the same channel, which is frequently associated with contrasted biocrust and/or vegetation covers. Biocrusts are known to be important surface stabilizing agents. However, their geomorphological consequences at the landscape scale are little known. In this study we combined field measurements with digital elevation models and image analysis to determine whether catchment asymmetry in the Tabernas Desert (semi-arid SE of Spain) is a local or general phenomenon, and to explore the main factors determining asymmetry occurrence, magnitude and direction. We pay special attention to the role of biocrusts. We found that catchment asymmetry is a very common phenomenon in the area; only 25% of the catchments are symmetrical, while approximately 40% present asymmetry with the relatively shady hillslope having a lower gradient, and 35% with that hillslope being the steeper. Solar radiation reaching the soil, surface area and channel gradient in the considered catchment stretch, as well as the total catchment area upstream from the lower point of the considered stretch were the main abiotic factors controlling the formation of the asymmetry. Microclimatic differentiation due to differences in radiation input caused by the uneven topography favoured the relative stabilization of the shadier hillslope and its colonization by biocrusts and later by plants. The effect of the biocrusts and vegetation protection against water erosion on shadier hillslopes is often stronger than that of the set of abiotic factors and gives rise to asymmetries with lower gradients in the shady hillslope by promoting lateral displacement of the channel. We hypothesised that the opposite pattern, with the sunnier hillslope having a lower gradient, occurs when abiotic factors control the development of asymmetry formation. In these conditions, the effect of biocrusts and plants would act in the opposite direction. We propose a conceptual model of feedbacks generating catchment asymmetry, with biocrust playing a crucial role.en_US
dc.publisherElsevieren_US
dc.relation.urlhttps://www.sciencedirect.com/science/article/abs/pii/S0016706121006066en_US
dc.rightsAttribution-NonCommercial-NoDerivatives 4.0 International*
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/en_US
dc.subjectbiological soil crustsen_US
dc.subjectdrylandsen_US
dc.subjectsemiariden_US
dc.subjectlandscapeen_US
dc.subjecttopographyen_US
dc.subjectBadlandsen_US
dc.titleBiocrusts and catchment asymmetry in Tabernas Desert (Almeria, Spain)en_US
dc.typeArticleen_US
dc.contributor.departmentEstacion Experimental de Zonas Aridas (CSIC); Universitat de Valencia; Universidad de Almeria; Manchester Metropolitan University; University of Chesteren_US
dc.identifier.journalGeodermaen_US
or.grant.openaccessYesen_US
rioxxterms.funderThis work was also supported by the DINCOS (CGL2016-78075-P) and REBIOARID (RTI2018-101921-B-I00) projects funded by the Spanish State Programme for Scientific Research and the European Union ERDF fundsen_US
rioxxterms.identifier.projectIREA Award, Alexander, 2015/16en_US
rioxxterms.versionAMen_US
rioxxterms.versionofrecord10.1016/j.geoderma.2021.115526en_US
rioxxterms.licenseref.startdate2023-10-15
dcterms.dateAccepted2021-10-04
rioxxterms.publicationdate2021-10-15
dc.date.deposited2021-12-08en_US
dc.indentifier.issn0016-7061en_US


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Attribution-NonCommercial-NoDerivatives 4.0 International
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