Heterorhizy can lead to underestimation of fine-root production when using mesh-based techniques

This study investigates the relationship between fine-root morphology and net mesh size in fine-root production (FRP) measurements (ingrowth core and net method). The data collected show that when a fine root has an apical diameter equal or bigger than the mesh size, the degree of difficulty in pass...

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Bibliographic Details
Published in:Acta oecologica (Montrouge) 2014-08, Vol.59 (59), p.84-90
Main Authors: Montagnoli, A., Terzaghi, M., Scippa, G.S., Chiatante, D.
Format: Article
Language:English
Subjects:
Animal, plant and microbial ecology
Biological and medical sciences
Fine-root morphology
Fine-root production
Fundamental and applied biological sciences. Psychology
General aspects. Techniques
Heterorhizy
Ingrowth core
Mesh size
Methods and techniques (sampling, tagging, trapping, modelling...)
Populus nigra
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Summary:This study investigates the relationship between fine-root morphology and net mesh size in fine-root production (FRP) measurements (ingrowth core and net method). The data collected show that when a fine root has an apical diameter equal or bigger than the mesh size, the degree of difficulty in passing through the net determines a response that arrests growth or deviation from the initial direction of growth. Both reactions prevent the root from crossing the net and induce the fine root to produce new laterals with thinner diameters. The investment in biomass necessary to form the new laterals is smaller than that needed to support the parental fine root and this leads to determines an underestimation of FRP. In particular, a considerable reduction of fine-root biomass in the area outside the netting was detected with a mesh size below 1.5 mm. The choice of net mesh size to be used for FRP measurement cannot be arbitrary, but should be evaluated through a preliminary analysis of fine-root morphology of experimental species prior to net installation. •We investigated fine-root morphology and production with mesh-based techniques.•We examined fine-root morphological response during growth when encountering the net.•Fine-root response occurs when apical diameter is equal or bigger than mesh size.•Root responses lead to an underestimation of fine-root production.
ISSN:1146-609X
1873-6238
DOI:10.1016/j.actao.2014.06.004