Changes induced by the roots of Erica arborea L. to create a suitable environment in a soil developed from alkaline and fine-textured marine sediments |
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Authors: | Stefania Cocco Alberto Agnelli George R Gobran Giuseppe Corti |
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Institution: | 1. Dipartimento di Scienze Agrarie, Alimentari e Ambientali, Università Politecnica delle Marche, Via Brecce Bianche, 60131, Ancona, Italy 2. Dipartimento di Scienze Agrarie ed Ambientali, Università degli Studi di Perugia, Borgo XX Giugno 72, 06121, Perugia, Italy 3. Department of Ecology, Swedish University of Agricultural Sciences, Uppsala, Sweden
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Abstract: | Background and aims We report on the modifications induced by the roots of Erica arborea L. on a soil derived from alkaline and fine-textured marine sediments. Methods Physical, chemical, mineralogical and biochemical properties of bulk soil and of the rhizosphere of Erica were characterised to evaluate its role on soil development. Results Once the upper horizons had been decarbonated because of geomorphic and pedogenic processes, Erica colonised the soil and progressively modified it through the activity of roots. In the upper horizons, there was no difference between rhizosphere and bulk soil for pH, organic C and exchangeable Al and H. At depth, pH, organic C and exchangeable Al and H differed between rhizosphere and bulk soil. The weathering reactions induced by the Erica roots caused a relative quartz enrichment in the rhizosphere compared with the bulk soil. In the E, EB and Bw horizons, the microbial community of the rhizosphere appeared better adapted than in the underlying 2Bw horizons, where the rhizospheric microorganisms were poorly adapted as these horizons represented the boundary between acid and sub-alkaline soil environments. Conclusions The activity of Erica roots modified soil properties so to produce more favourable conditions for itself and the rhizosphere microflora. |
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