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Contrasting rooting patterns of some arid-zone fruit tree species from Botswana – I. Fine root distribution

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Abstract

To assess the possible degree of root competition from fruit trees which could potentially be used in agroforestry systems, fine root density of fruit trees Strychnos cocculoides Bak., Strychnos spinosa Lam. (Loganiaceae) and Vangueria infausta Burch. (Rubiaceae), as well as from the shrubby species, Grewia flava DC. (Tiliaceae) was investigated. Vangueria infausta had the highest fine root densities in both vertical and horizontal extensions. In Vangueria infausta fine root density decreased with increasing soil depth. For the other species in the 80 cm soil profile investigated, no significant changes in fine root density with soil depth were found. For Strychnos cocculoides almost no fine roots were detected in the upper soil horizon (0–20 cm). Using fine root surface area densities, exploration and exploitation indices were calculated. Vangueria infausta had the highest value of the exploration index compared to the other species. For use in agroforestry systems Vangueria infausta was estimated to be the most competitive of the investigated species, whereas Strychnos cocculoides seems to be the less competitive. Strychnos cocculoides has additionally spatial arrangements of fine roots favourable for agroforestry, slowly increasing with depth and additionally low concentrations in upper soil layers.

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Authors and Affiliations

  1. Institut für Forstbotanik, Georg-August-Universität Göttingen, Büsgenweg 2, D-37077, Göttingen, Germany

    Armin L. Oppelt

  2. Institut für Informatik, Lehrstuhl Grafische Systeme, Brandenburgische Technische Universität Cottbus, Postfach 101344, 03013, Cottbus, Germany

    Winfried Kurth

  3. School of Agricultural and Forest Sciences, University of Wales, Bangor, LL57 2UW, Bangor, Gwynedd, UK

    Georg Jentschke & Douglas L. Godbold

Authors
  1. Armin L. Oppelt
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  2. Winfried Kurth
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  3. Georg Jentschke
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  4. Douglas L. Godbold
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Correspondence to Armin L. Oppelt.

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Oppelt, A., Kurth, W., Jentschke, G. et al. Contrasting rooting patterns of some arid-zone fruit tree species from Botswana – I. Fine root distribution. Agroforest Syst 64, 1–11 (2005). https://doi.org/10.1007/s10457-005-2402-8

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  • DOI: https://doi.org/10.1007/s10457-005-2402-8

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