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Tree root characteristics as criteria for species selection and systems design in agroforestry

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Agroforestry: Science, Policy and Practice

Part of the book series: Forestry Sciences ((FOSC,volume 47))

Abstract

This literature review presents information about the role of tree root systems for the functioning of agroforestry associations and rotations and attempts to identify root-related criteria for the selection of agroforestry tree species and the design of agroforestry systems. Tree roots are expected to enrich soil with organic matter, feed soil biomass, reduce nutrient leaching, recycle nutrients from the subsoil below the crop rooting zone and improve soil physical properties, among other functions. On the other hand, they can depress crop yields in tree-crop associations through root competition. After a brief review of favourable tree root effects in agroforestry, four strategies are discussed as potential solutions to the dilemma of the simultaneous occurrence of desirable and undesirable tree root functions: 1) the selection of tree species with low root competitiveness, eventually supplemented by shoot pruning; 2) the identification of trees with a root distribution complementary to that of the crops; 3) the reduction of tree root length density by trenching or tillage; and 4) the use of agroforestry rotations instead of tree-crop associations. The potential and limitations of these strategies are discussed, and deficits in current understanding of tree root ecology in agroforestry are identified. In addition to the selection of tree species and provenances according to root-related criteria, the development of management techniques that allow the manipulation of tree root systems to maximize benefit and minimize competition are proposed as important tasks for future agroforestry research.

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  1. Institute of Soil Science and Soil Geography, University of Bayreuth, D-95440, Bayreuth, Germany

    G. Schroth

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  1. School of Agricultural and Forest Sciences, University of Wales, Bangor, UK

    Fergus L. Sinclair

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Schroth, G. (1995). Tree root characteristics as criteria for species selection and systems design in agroforestry. In: Sinclair, F.L. (eds) Agroforestry: Science, Policy and Practice. Forestry Sciences, vol 47. Springer, Dordrecht. https://doi.org/10.1007/978-94-017-0681-0_6

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  • DOI: https://doi.org/10.1007/978-94-017-0681-0_6

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