Unexpected phenology and lifespan of shallow and deep fine roots of walnut 
trees grown in a silvoarable Mediterranean agroforestry system

Germon, Amandine; Cardinael, Remi; Prieto, Ivan; Mao, Zhun; Kim, John; Stokes, Alexia; Dupraz, Christian; Laclau, Jean-Paul; Jourdan, Christophe

doi:10.1007/s11104-015-2753-5

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Unexpected phenology and lifespan of shallow and deep fine roots of walnut trees grown in a silvoarable Mediterranean agroforestry system

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Kim, John
Department Biogeochemical Processes, Prof. S. E. Trumbore, Max Planck Institute for Biogeochemistry , Max Planck Society;

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Citation

Germon, A., Cardinael, R., Prieto, I., Mao, Z., Kim, J., Stokes, A., et al. (2016). Unexpected phenology and lifespan of shallow and deep fine roots of walnut trees grown in a silvoarable Mediterranean agroforestry system. Plant and Soil, 401(1), 409-426. doi:10.1007/s11104-015-2753-5.

Cite as: https://hdl.handle.net/11858/00-001M-0000-002A-3F12-D

Abstract

Fine roots play a major role in the global carbon cycle through respiration, exudation and decomposition processes, but their dynamics are poorly understood. Current estimates of root dynamics have principally been observed in shallow soil horizons (<1 m), and mainly in forest systems.We studied walnut (Juglans regia×nigra L.) fine root dynamics in an agroforestry system in a Mediterranean climate, with a focus on deep soils (down to 5 m), and root dynamics throughout the year. Methods Sixteen minirhizotron tubes were installed in a soil pit, at depths of 0.0–0.7, 1.0–1.7, 2.5–3.2 and 4.0– 4.7 m and at two distances from the nearest trees (2 and 5m). Fine root (diameter≤2mm) dynamicswere recorded across three diameter classes every 3 weeks for 1 year to determine their phenology and turnover in relation to soil depth, root diameter and distance from the tree row.