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Uptake capacity of amino acids by ten grasses and forbs in relation to soil acidity and nitrogen availability

Falkengren-Grerup, Ursula LU ; Månsson, Katarina LU and Olsson, M O (2000) In Environmental and Experimental Botany 44(3). p.207-219
Abstract
Uptake capacity of organic nitrogen was studied in solution experiments on eight grasses and two forbs growing in acid soils with relatively high nitrogen mineralisation in southern Sweden. Uptake of a mixture of amino acids (alanine, glutamine, glycine), that varied between 1.6 and 6.3 mu mol g(-1) dw root h(-1), could not be explained by soil data from the species' field distributions (pH, total carbon and nitrogen, potential net mineralisation of ammonium and nitrate). The ratio between organic and inorganic nitrogen (methylamine) uptake was < 0.05 for the forbs, higher for the grasses with a maximum of 1.42 for Deschampsia flexuosa. The ratio was negatively correlated with measures related to soil acidity (Ellenberg's R-value, soil... (More)
Uptake capacity of organic nitrogen was studied in solution experiments on eight grasses and two forbs growing in acid soils with relatively high nitrogen mineralisation in southern Sweden. Uptake of a mixture of amino acids (alanine, glutamine, glycine), that varied between 1.6 and 6.3 mu mol g(-1) dw root h(-1), could not be explained by soil data from the species' field distributions (pH, total carbon and nitrogen, potential net mineralisation of ammonium and nitrate). The ratio between organic and inorganic nitrogen (methylamine) uptake was < 0.05 for the forbs, higher for the grasses with a maximum of 1.42 for Deschampsia flexuosa. The ratio was negatively correlated with measures related to soil acidity (Ellenberg's R-value, soil nitrate and total carbon) but not, as hypothesised, with the total amount of mineralised nitrogen. The total demand on nitrogen by all components of the ecosystem would probably have described the extent to which competition among and between plants and microbes induced nitrogen limitation. In a methodological study two grasses were exposed to pH 3.8, 4.5 and 6.0 and to 50, 100 and 250 <mu>mol l(-1) of three amino acids. Uptake was also compared between intact plants and excised roots. The treatment response varied considerably between the species which stresses the importance of studying intact plants at field-relevant pH and concentrations. (C) 2000 Elsevier Science B.V. All rights reserved. (Less)
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organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Environmental and Experimental Botany
volume
44
issue
3
pages
207 - 219
publisher
Elsevier
external identifiers
  • scopus:0033757781
ISSN
0098-8472
DOI
10.1016/S0098-8472(00)00068-X
language
English
LU publication?
yes
id
97460000-ea82-4b6e-8b6b-5beed081e437 (old id 147303)
date added to LUP
2007-07-02 09:43:09
date last changed
2017-07-09 04:25:23
@article{97460000-ea82-4b6e-8b6b-5beed081e437,
  abstract     = {Uptake capacity of organic nitrogen was studied in solution experiments on eight grasses and two forbs growing in acid soils with relatively high nitrogen mineralisation in southern Sweden. Uptake of a mixture of amino acids (alanine, glutamine, glycine), that varied between 1.6 and 6.3 mu mol g(-1) dw root h(-1), could not be explained by soil data from the species' field distributions (pH, total carbon and nitrogen, potential net mineralisation of ammonium and nitrate). The ratio between organic and inorganic nitrogen (methylamine) uptake was &lt; 0.05 for the forbs, higher for the grasses with a maximum of 1.42 for Deschampsia flexuosa. The ratio was negatively correlated with measures related to soil acidity (Ellenberg's R-value, soil nitrate and total carbon) but not, as hypothesised, with the total amount of mineralised nitrogen. The total demand on nitrogen by all components of the ecosystem would probably have described the extent to which competition among and between plants and microbes induced nitrogen limitation. In a methodological study two grasses were exposed to pH 3.8, 4.5 and 6.0 and to 50, 100 and 250 &lt;mu&gt;mol l(-1) of three amino acids. Uptake was also compared between intact plants and excised roots. The treatment response varied considerably between the species which stresses the importance of studying intact plants at field-relevant pH and concentrations. (C) 2000 Elsevier Science B.V. All rights reserved.},
  author       = {Falkengren-Grerup, Ursula and Månsson, Katarina and Olsson, M O},
  issn         = {0098-8472},
  language     = {eng},
  number       = {3},
  pages        = {207--219},
  publisher    = {Elsevier},
  series       = {Environmental and Experimental Botany},
  title        = {Uptake capacity of amino acids by ten grasses and forbs in relation to soil acidity and nitrogen availability},
  url          = {http://dx.doi.org/10.1016/S0098-8472(00)00068-X},
  volume       = {44},
  year         = {2000},
}