Desert Soils

Dunkerley, David

doi:10.1002/9780470710777.ch7

Cited by 9 publications

(2 citation statements)

References 122 publications

(128 reference statements)

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“…In this area, Bradley et al, (2018) identified increases of and variations in amounts of evaporite and carbonate minerals in the interdunes when compared to the dunes, and these differences influence the type and size variations of the shrub vegetation found across the interdunes. Dunkerley (2011) found that vegetation can be coincident with agricultural activity because irrigation distributes groundwater and nutrients, and this was found around farms in the three study locations, clearly a consequence of pivot irrigation and small farm activities. Even around unused pivot irrigation the results and observations from the field find that vegetation, such as Haloxylon and an herbaceous cover, can grow in areas of previous agricultural disturbance, which Dunkerley (2011) also found can be a consequence of soil crusts being broken up by previous ploughing.…”

Section: Topographic Relationships With Ivpmentioning

confidence: 73%

“…The coincidence of these factors may cause clustering of vegetation in an oasis (Gimingham, 1955) and in arid regions spatial variations of these factors may cause spatial patterning of the vegetation (Aguir and Sala 1999). Additionally, in arid environments and deserts predominant factors such as slope angle and aspect (Parker 1991, Valentin et al, 1999Aguir and Sala 1999), salinization of groundwater and soils (Boer and Seargeant 1998;El-Keblawy et al, 2015;Aly et al, 2016), and presence of impermeable crusts (Bromley, 1977) which in sandy deserts are normally found at the base of dunes (Dunkerley, 2011) can influence vegetation distribution.…”

Section: Introductionmentioning

confidence: 99%

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Spatial variability in shrub vegetation across dune forms in central Saudi Arabia

Bradley

Haughan

Al-Dughairi

et al. 2019

Journal of Arid Environments

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In desert dune environments, vegetation may be an indicator of dune stability and rates of sediment transport. As topography and underlying controls of vegetation vary over large spatial areas variations in dune form make scaling up of field research difficult. To mitigate this, and to identify spatial variations in vegetation distributions in a Saudi Arabian sand sea, spectral information from high resolution satellite images was classified to map polygons of shrub vegetation over 360 km 2 of well-defined linear dunes, broken linear dunes and dome dune forms. When compared to topographic characteristics of the landscape extracted from a digital elevation model, vegetation densities were often highest on 10 to 20-degree slopes elevated above interdune salt deposits on dune flanks. Spatially this was confined to small areas, and density was not always related to dune form, more to the presence of groundwater which could also encourage vegetation on the tops of some dunes. Field observations identified shrubs of mainly Calligonum genus whose size is related to the amounts of salts, moving sediment and access to the water table that varies within and between dune forms. Shrub vegetation density is likened to surface roughness to better understand sediment movement in this environment.

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Section: Topographic Relationships With Ivpmentioning

confidence: 73%

Section: Introductionmentioning

confidence: 99%

Spatial variability in shrub vegetation across dune forms in central Saudi Arabia

Bradley

Haughan

Al-Dughairi

et al. 2019

Journal of Arid Environments

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A

2016

The Dictionary of Physical Geography, 4th Edition

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Geomorphological analysis of the Antinaco‐Los Colorados valley, La Rioja province, Argentina

Corbat,

Fucks,

Juárez

et al. 2024

Earth Surf Processes Landf

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The Antinaco‐Los Colorados valley (ALCV) is a tectonic depression located in the centre‐north of the province of La Rioja (Argentina), limited to both the east and west by mountain ranges, in the broken foreland region. Geomorphological research on environmental dynamics is important for both building a reference framework for further studies and for the development of the socio‐economic activities in the area. This study presents the main geomorphological features of the tectonic depression at the regional scale in order to identify the primary factors involved in its evolution and the landforms it contains. The ALCV is asymmetric, and it is filled by up to 1600 m of sediments along the western margin. Using literature, images, digital elevation models of the study area and field work, different morphologies were identified in the valley, mostly linked to Quaternary climatic and tectonic changes. These morphologies were grouped into three main morphogenetic units that characterize this landscape: the relict piedmont levels, the current piedmont and the fluvial‐aeolian plain. The identification of fluvial forms suggests that fluvial systems have been important during the evolution of the landscape. Aeolian accumulation features, currently mostly vegetated, were likely formed under drier climatic conditions than those at present and probably related to the last ice age or even more recent times. Successive reactivations of the overall system are not only tectonic, as evidenced by the structural lineaments that affect relict piedmont levels and the fluvial‐aeolian plain, but also climatic. Thus, the identified landforms suggest that climatic and tectonic variables account for the variations in the environment of the ALCV, affecting the reaccommodation of the exogenous geomorphological processes and the modelling of the relief.

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Desert Soils

Cited by 9 publications

References 122 publications

Spatial variability in shrub vegetation across dune forms in central Saudi Arabia

Spatial variability in shrub vegetation across dune forms in central Saudi Arabia

A

Geomorphological analysis of the Antinaco‐Los Colorados valley, La Rioja province, Argentina

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