, Volume 89, Issue 2, pp 149-164

Soil-vegetation relationship at several arid microsites in the Wadi Araba (Jordan)

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Abstract

With the aim to specify the microhabitats of annual plants at arid sites, five different sites within an Acacietum tortilis in the Wadi Araba were investigated. During one vegetation period, plants and soil conditions were analyzed simultaneously and the results were correlated. The water regime is one of the most important facts influencing vegetation pattern: On the one hand, additional lateral water favours the conditions of some microhabitats, on the other hand, the plant available water is strongly limited by salinization leading to osmotic stress. Additionally, ion specific effects of salinization influence the vegetation pattern. The different supply of nitrogen scarcely influences plant growth. The character of the surface can be important for the plant establishment and therefore for the species composition at the different sites.