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Do oaks have different strategies for uptake of N, K and P depending on soil depth?

Göransson, Hans LU ; Fransson, Ann-Mari LU and Jönsson Belyazid, Ulrika LU (2007) In Plant and Soil 297(1-2). p.119-125
Abstract
The uptake of nutrients from deep soil layers has been shown to be important for the long-term nutrient sustainability of forest soils. When modelling nutrient uptake in forest ecosystems, the nutrient uptake capacity of trees is usually defined by the root distribution. However, this leads to the assumption that roots at different soil depths have the same capacity to take up nutrients. To investigate if roots located at different soil depths differ in their nutrient uptake capacity, here defined as the nutrient uptake rate under standardized conditions, a bioassay was performed on excised roots (< 1 mm) of eight oak trees (Quercus robur L.). The results showed that the root uptake rate of Rb-86(+) (used as an analogue for K+ stop)... (More)
The uptake of nutrients from deep soil layers has been shown to be important for the long-term nutrient sustainability of forest soils. When modelling nutrient uptake in forest ecosystems, the nutrient uptake capacity of trees is usually defined by the root distribution. However, this leads to the assumption that roots at different soil depths have the same capacity to take up nutrients. To investigate if roots located at different soil depths differ in their nutrient uptake capacity, here defined as the nutrient uptake rate under standardized conditions, a bioassay was performed on excised roots (< 1 mm) of eight oak trees (Quercus robur L.). The results showed that the root uptake rate of Rb-86(+) (used as an analogue for K+ stop) declined with increasing soil depth, and the same trend was found for NH4+. The root uptake rate of H2PO4-, on the other hand, did not decrease with soil depth. These different physiological responses in relation to soil depth indicate differences in the oak roots, and suggest that fine roots in shallow soil layers may be specialized in taking up nutrients such as K+ and NH4+ which have a high availability in these layers, while oak roots in deep soil layers are specialized in taking up other resources, such as P, which may have a high availability in deep soil layers. Regardless of the cause of the difference in uptake trends for the various nutrients, these differences have consequences for the modelling of the soil nutrient pool beneath oak trees and raise the question of whether roots can be treated uniformly, as has previously been done in forest ecosystem models. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
N-15, root bioassay, nutrient uptake, Quercus robur, soil depth, (RB)-R-86, P-32
in
Plant and Soil
volume
297
issue
1-2
pages
119 - 125
publisher
Springer
external identifiers
  • wos:000248856600010
  • scopus:34548090497
ISSN
0032-079X
DOI
10.1007/s11104-007-9325-2
language
English
LU publication?
yes
id
3cf50bd9-659e-480b-913d-3884f9aec5a0 (old id 689842)
date added to LUP
2007-12-07 12:37:28
date last changed
2017-05-07 04:22:08
@article{3cf50bd9-659e-480b-913d-3884f9aec5a0,
  abstract     = {The uptake of nutrients from deep soil layers has been shown to be important for the long-term nutrient sustainability of forest soils. When modelling nutrient uptake in forest ecosystems, the nutrient uptake capacity of trees is usually defined by the root distribution. However, this leads to the assumption that roots at different soil depths have the same capacity to take up nutrients. To investigate if roots located at different soil depths differ in their nutrient uptake capacity, here defined as the nutrient uptake rate under standardized conditions, a bioassay was performed on excised roots (&lt; 1 mm) of eight oak trees (Quercus robur L.). The results showed that the root uptake rate of Rb-86(+) (used as an analogue for K+ stop) declined with increasing soil depth, and the same trend was found for NH4+. The root uptake rate of H2PO4-, on the other hand, did not decrease with soil depth. These different physiological responses in relation to soil depth indicate differences in the oak roots, and suggest that fine roots in shallow soil layers may be specialized in taking up nutrients such as K+ and NH4+ which have a high availability in these layers, while oak roots in deep soil layers are specialized in taking up other resources, such as P, which may have a high availability in deep soil layers. Regardless of the cause of the difference in uptake trends for the various nutrients, these differences have consequences for the modelling of the soil nutrient pool beneath oak trees and raise the question of whether roots can be treated uniformly, as has previously been done in forest ecosystem models.},
  author       = {Göransson, Hans and Fransson, Ann-Mari and Jönsson Belyazid, Ulrika},
  issn         = {0032-079X},
  keyword      = {N-15,root bioassay,nutrient uptake,Quercus robur,soil depth,(RB)-R-86,P-32},
  language     = {eng},
  number       = {1-2},
  pages        = {119--125},
  publisher    = {Springer},
  series       = {Plant and Soil},
  title        = {Do oaks have different strategies for uptake of N, K and P depending on soil depth?},
  url          = {http://dx.doi.org/10.1007/s11104-007-9325-2},
  volume       = {297},
  year         = {2007},
}