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Fine root distribution of trees and understory in mature stands of maritime pine (Pinus pinaster) on dry and humid sites

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Abstract

Maritime pine (Pinus pinaster) is the main tree cropping species in the Landes of Gascogne forest range in south western France. Soils are nutrient poor, sandy podzosols and site fertility is determined essentially by organic matter content and depth of water table, which is known to limit root growth. We hypothesised, with an ultimate goal of constructing a nutrient uptake model applicable to this region, that the organic top horizons together with the depth of the water table should be the most important parameters related to fine root distribution and presence of associated mycorrhiza. To test this hypothesis, we compared two adult Pinus pinaster stands, contrasting in depth of water table and soil fertility and evaluated fine roots (diameter ≤2 mm) of understory species and fine roots and ectomycorrhizal morphotypes of Pinus pinaster down to 1.2 m, using a soil corer approach. Total fine root biomass of Pinus pinaster was not significantly different between both sites (3.6 and 4.5 t ha−1 for the humid, respectively, dry site), but root distribution was significantly shallower and root diameter increased more with depth at the humid site, presumably due to more adverse soil conditions as related to the presence of a hardpan, higher amount of aluminium oxides and / or anoxia. Fine roots of Pinus pinaster represented only about 30% of total fine root biomass and 15% of total fine root length, suggesting that the understory species cannot be ignored with regards to competition for mineral nutrients and water. A comparison of the ectomycorrhizal morphotypes showed that the humid site could be characterised by a very large proportion of contact exploration types, thought to be more relevant in accessing organic nutrient sources, whereas the dry site had a significantly higher proportion of both long-distance and short-distance exploration types, the latter of which was thought to be more resistant to short-term drought periods. These results partly confirm our hypothesis on root distribution as related to the presence of soil mineral nutrients (i.e. in organic matter), point out the potential role of understory plant species and ectomycorrhizal symbiosis and are a valuable step in building a site-specific nutrient uptake model.

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Acknowledgements

The authors wish to thank Pierre Trichet for helpful suggestions in establishing a framework for determination of the roots of the different species of the understory, Jacques Guinberteau for his help in recognising the ectomycorrhizal morphotypes and Mathieu Jonard for his advice on the mixed linear model. We are also grateful to three anonymous reviewers and the editor for their constructive comments to previous versions of the manuscript. Céline Gire, Christian Barbot, Sylvie Niollet and Alain Mollier are thanked for cheerfully helping the authors in collecting the field samples.

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  1. UMR 1220 TCEM (INRA-ENITAB), ENITA de Bordeaux, 71 avenue E Bourlaux, BP 81, F-33883, Villenave d’Ornon, France

    M. R. Bakker & D. L. Achat

  2. UMR 1220 TCEM (INRA-ENITAB), INRA, 71 avenue E Bourlaux, BP 81, F-33883, Villenave d’Ornon, France

    L. Augusto

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  1. M. R. Bakker
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Correspondence to M. R. Bakker.

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Bakker, M.R., Augusto, L. & Achat, D.L. Fine root distribution of trees and understory in mature stands of maritime pine (Pinus pinaster) on dry and humid sites. Plant Soil 286, 37–51 (2006). https://doi.org/10.1007/s11104-006-9024-4

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