干旱区生态环境知识资源中心(Arid): Biocrusts and catchment asymmetry in Tabernas Desert (Almeria, Spain)

Arid

DOI	10.1016/j.geoderma.2021.115526
	Biocrusts and catchment asymmetry in Tabernas Desert (Almeria, Spain)
	Lazaro, Roberto; Calvo-Cases, Adolfo; Rodriguez-Caballero, Emilio; Arnau-Rosalen, Eva; Alexander, Roy; Rubio, Consuelo; Canton, Yolanda; Sole-Benet, Albert; Puigdefabregas, Juan
通讯作者	Lazaro, R (corresponding author), Estn Expt Zonas Aridas CSIC, Almeria, Spain.
来源期刊	GEODERMA
ISSN	0016-7061
EISSN	1872-6259
出版年	2022
卷号	406
英文摘要	Catchment 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.
英文关键词	Biological soil crusts Drylands Semiarid Landscape Topography Badlands
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000708893700018
WOS关键词	BIOLOGICAL SOIL CRUSTS ; SEMIARID ECOSYSTEMS ; SE SPAIN ; LANDSCAPE EVOLUTION ; SOLAR-RADIATION ; CLIMATE-CHANGE ; BADLANDS ; SURFACE ; EROSION ; RUNOFF
WOS类目	Soil Science
WOS研究方向	Agriculture
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/363402
作者单位	[Lazaro, Roberto; Rubio, Consuelo; Sole-Benet, Albert; Puigdefabregas, Juan] Estn Expt Zonas Aridas CSIC, Almeria, Spain; [Calvo-Cases, Adolfo] Univ Valencia, Interuniv Inst Local Dev, Valencia, Spain; [Rodriguez-Caballero, Emilio; Canton, Yolanda] Univ Almeria, Dept Agron, Almeria, Spain; [Rodriguez-Caballero, Emilio; Canton, Yolanda] Univ Almeria CECOUAL, Ctr Colecc Cient, Almeria, Spain; [Arnau-Rosalen, Eva] Manchester Metropolitan Univ, Dept Nat Sci, Manchester, Lancs, England; [Alexander, Roy] Univ Chester, Dept Geog & Int Dev, Chester, Cheshire, England
推荐引用方式 GB/T 7714	Lazaro, Roberto,Calvo-Cases, Adolfo,Rodriguez-Caballero, Emilio,et al. Biocrusts and catchment asymmetry in Tabernas Desert (Almeria, Spain)[J],2022,406.
APA	Lazaro, Roberto.,Calvo-Cases, Adolfo.,Rodriguez-Caballero, Emilio.,Arnau-Rosalen, Eva.,Alexander, Roy.,...&Puigdefabregas, Juan.(2022).Biocrusts and catchment asymmetry in Tabernas Desert (Almeria, Spain).GEODERMA,406.
MLA	Lazaro, Roberto,et al."Biocrusts and catchment asymmetry in Tabernas Desert (Almeria, Spain)".GEODERMA 406(2022).