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The labile SOC and CO2 flux rate showed an increasing trend in the edge, windward, and top positions. The finest sediments were observed on the dune edge. Sediment grain size distribution, geometric mean diameter, mean weight diameter, labile SOC, CO2 flux, and C mineralization ratio were measured. The sediment sampling process was performed within different positions of each dune. We evaluated the impacts of the interactions among hydro-aeolian processes and micro-geomorphology on mechanisms controlling the sediment carbon source and sink within a coppice dune. Empirical results were used to develop a conceptual model that explains the spatial distribution of bio- and geo-morphological characteristics of an arid nebkha foredune. Results indicate close relationships between distance from the sea, plant coverage, and sediment patterns. A two-step process using multiple linear regression (MLR) analyses was developed to characterize 1) the influence that morphological variables and distance from the sea have on plant and sediment patterns on nebkha, and 2) the influence of plants on depositional sediment characteristics. Variables were sampled at 120 plots in a 0.5 × 0.5 m square grid. With the aim of exploring variables affecting arid foredunes, a range of morphological, sedimentological, and vegetation characteristics were measured on a single nebkha formed by a Traganum moquinii plant located in the foredune of Caleta de Famara beach (Lanzarote, Canary Islands).
#Coppice dune drivers#
While continuous foredunes in temperate climates have been widely studied, knowledge of interactions between biotic and abiotic drivers in foredunes formed by nebkha is still scarce. Foredunes in arid coastal dune systems comprise nebkhas, which originate by interactions between vegetation and aeolian sedimentation.