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Fine root classification matters : nutrient levels in different functional categories, orders and diameters of roots in boreal Pinus sylvestris across a latitudinal gradient

Mucha, Joanna ; Zadworny, Marcin ; Helmisaari, Heljä Sisko ; Nihlgård, Bengt LU ; Repo, Tapani ; Żytkowiak, Maciej ; Małek, Stanisław ; Reich, Peter B. and Oleksyn, Jacek (2020) In Plant and Soil 447(1-2). p.507-520
Abstract

Background: Fine roots and their symbionts are the key drivers of processes such as nutrient cycling and belowground productivity. Their function depends on position in a branching hierarchy, with absorptive roots (responsible for resource acquisition), and transport roots. Aim: We examined how the different diameter cutoffs for root classification mirror concentrations of 11 different nutrients, plus Al in functionally different fine roots of Pinus sylvestris based on anatomical/ functional categorization and in relation to their biomass along a latitudinal gradient. Results: The C:N:P ratios for pooled roots ≤2 mm in diameter reflected the nutrient concentrations of transport roots. In contrast, the C:N:P ratios for all absorptive... (More)

Background: Fine roots and their symbionts are the key drivers of processes such as nutrient cycling and belowground productivity. Their function depends on position in a branching hierarchy, with absorptive roots (responsible for resource acquisition), and transport roots. Aim: We examined how the different diameter cutoffs for root classification mirror concentrations of 11 different nutrients, plus Al in functionally different fine roots of Pinus sylvestris based on anatomical/ functional categorization and in relation to their biomass along a latitudinal gradient. Results: The C:N:P ratios for pooled roots ≤2 mm in diameter reflected the nutrient concentrations of transport roots. In contrast, the C:N:P ratios for all absorptive roots was best reflected by nutrient ratios in the 1st root order, and not by those in root <2 mm. These patterns were more clear along decreasing mean annual temperature, despite increasing contribution of absorptive roots in the fine root biomass. Higher biomass fraction of transport roots did not always mirror higher concentration of element accumulated. Narrowing the root diameter cutoffs to 0.5 mm provided more informative data about nutrient concentrations in the absorptive root pool than <2 mm cut-off. Conclusions: By analyzing nutrient concentration using ≤2 mm cut-off it is impossible to properly understand nutritional properties of roots with different functional attributes. Given that the diameter of fine root orders vary considerably even within a single species between stands, the diameter cutoffs for absorptive roots should be based on the characteristics of the studied species, and not on a fixed, universal diameter cutoff.

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organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Absorptive vs. transport roots, Diameter cutoffs, Fine roots, Nutrients
in
Plant and Soil
volume
447
issue
1-2
pages
14 pages
publisher
Springer
external identifiers
  • scopus:85077081743
ISSN
0032-079X
DOI
10.1007/s11104-019-04395-1
language
English
LU publication?
yes
id
186bac4a-359e-4183-839c-95f0837bc40e
date added to LUP
2021-01-13 00:17:54
date last changed
2021-01-13 00:17:54
@article{186bac4a-359e-4183-839c-95f0837bc40e,
  abstract     = {<p>Background: Fine roots and their symbionts are the key drivers of processes such as nutrient cycling and belowground productivity. Their function depends on position in a branching hierarchy, with absorptive roots (responsible for resource acquisition), and transport roots. Aim: We examined how the different diameter cutoffs for root classification mirror concentrations of 11 different nutrients, plus Al in functionally different fine roots of Pinus sylvestris based on anatomical/ functional categorization and in relation to their biomass along a latitudinal gradient. Results: The C:N:P ratios for pooled roots ≤2 mm in diameter reflected the nutrient concentrations of transport roots. In contrast, the C:N:P ratios for all absorptive roots was best reflected by nutrient ratios in the 1st root order, and not by those in root &lt;2 mm. These patterns were more clear along decreasing mean annual temperature, despite increasing contribution of absorptive roots in the fine root biomass. Higher biomass fraction of transport roots did not always mirror higher concentration of element accumulated. Narrowing the root diameter cutoffs to 0.5 mm provided more informative data about nutrient concentrations in the absorptive root pool than &lt;2 mm cut-off. Conclusions: By analyzing nutrient concentration using ≤2 mm cut-off it is impossible to properly understand nutritional properties of roots with different functional attributes. Given that the diameter of fine root orders vary considerably even within a single species between stands, the diameter cutoffs for absorptive roots should be based on the characteristics of the studied species, and not on a fixed, universal diameter cutoff.</p>},
  author       = {Mucha, Joanna and Zadworny, Marcin and Helmisaari, Heljä Sisko and Nihlgård, Bengt and Repo, Tapani and Żytkowiak, Maciej and Małek, Stanisław and Reich, Peter B. and Oleksyn, Jacek},
  issn         = {0032-079X},
  language     = {eng},
  month        = {02},
  number       = {1-2},
  pages        = {507--520},
  publisher    = {Springer},
  series       = {Plant and Soil},
  title        = {Fine root classification matters : nutrient levels in different functional categories, orders and diameters of roots in boreal Pinus sylvestris across a latitudinal gradient},
  url          = {http://dx.doi.org/10.1007/s11104-019-04395-1},
  doi          = {10.1007/s11104-019-04395-1},
  volume       = {447},
  year         = {2020},
}