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Chemical changes in organic matter after fungal colonization in a nitrogen fertilized and unfertilized Norway spruce forest

Nicolás, César LU ; Almeida, Juan P. LU ; Ellström, Magnus LU ; Bahr, Adam LU ; Bone, Sharon E.; Rosenstock, Nicholas P. LU ; Bargar, John R.; Tunlid, Anders LU ; Persson, Per LU and Wallander, Håkan LU (2017) In Plant and Soil
Abstract

Background and aims: Decomposition and transformation of organic matter (OM) in forest soils are conducted by the concomitant action of saprotrophic and mycorrhizal fungi. Here, we examine chemical changes in OM after fungal colonization in nitrogen fertilized and unfertilized soils from a Norway spruce forest. Methods: Sand-filled bags amended with composted maize leaves were placed in the forest soil and harvested after 17 months. Infrared and near edge X-ray absorption fine structure spectroscopies were used to study the chemical changes in the OM. Fungal community composition of the bags was also evaluated. Results: The proportion of ectomycorrhizal fungi declined in the fertilized plots, but the overall fungal community composition... (More)

Background and aims: Decomposition and transformation of organic matter (OM) in forest soils are conducted by the concomitant action of saprotrophic and mycorrhizal fungi. Here, we examine chemical changes in OM after fungal colonization in nitrogen fertilized and unfertilized soils from a Norway spruce forest. Methods: Sand-filled bags amended with composted maize leaves were placed in the forest soil and harvested after 17 months. Infrared and near edge X-ray absorption fine structure spectroscopies were used to study the chemical changes in the OM. Fungal community composition of the bags was also evaluated. Results: The proportion of ectomycorrhizal fungi declined in the fertilized plots, but the overall fungal community composition was similar between N treatments. Decomposition of the OM was, independently of the N level or soil horizon, accompanied by an increase of C/N ratio of the mesh-bag content. Moreover, the proportions of carboxylic compounds in the incubated OM increased in the mineral horizon, while heterocyclic-N compounds decreased, especially in unfertilized plots with higher N demand from the trees. Conclusions: Our results indicate that more oxidized organic C and less heterocyclic-N proportions in the OM remain after fungal colonization in the mineral layers, and suggest that ectomycorrhizal fungi transfer less heterocyclic-N from the mesh bags to the host trees under high N levels.

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organization
publishing date
type
Contribution to journal
publication status
epub
subject
keywords
Fungal community composition, Infrared spectroscopy, Near-edge X-ray absorption fine structure (NEXAFS) spectroscopy, Nitrogen fertilization, Norway spruce forest, Organic matter decomposition
in
Plant and Soil
pages
14 pages
publisher
Springer
external identifiers
  • scopus:85022054428
ISSN
0032-079X
DOI
10.1007/s11104-017-3324-8
language
English
LU publication?
yes
id
62c5756d-6d07-4a1e-a76c-8adf775038ad
date added to LUP
2017-07-24 10:31:45
date last changed
2017-07-24 10:31:45
@article{62c5756d-6d07-4a1e-a76c-8adf775038ad,
  abstract     = {<p>Background and aims: Decomposition and transformation of organic matter (OM) in forest soils are conducted by the concomitant action of saprotrophic and mycorrhizal fungi. Here, we examine chemical changes in OM after fungal colonization in nitrogen fertilized and unfertilized soils from a Norway spruce forest. Methods: Sand-filled bags amended with composted maize leaves were placed in the forest soil and harvested after 17 months. Infrared and near edge X-ray absorption fine structure spectroscopies were used to study the chemical changes in the OM. Fungal community composition of the bags was also evaluated. Results: The proportion of ectomycorrhizal fungi declined in the fertilized plots, but the overall fungal community composition was similar between N treatments. Decomposition of the OM was, independently of the N level or soil horizon, accompanied by an increase of C/N ratio of the mesh-bag content. Moreover, the proportions of carboxylic compounds in the incubated OM increased in the mineral horizon, while heterocyclic-N compounds decreased, especially in unfertilized plots with higher N demand from the trees. Conclusions: Our results indicate that more oxidized organic C and less heterocyclic-N proportions in the OM remain after fungal colonization in the mineral layers, and suggest that ectomycorrhizal fungi transfer less heterocyclic-N from the mesh bags to the host trees under high N levels.</p>},
  author       = {Nicolás, César and Almeida, Juan P. and Ellström, Magnus and Bahr, Adam and Bone, Sharon E. and Rosenstock, Nicholas P. and Bargar, John R. and Tunlid, Anders and Persson, Per and Wallander, Håkan},
  issn         = {0032-079X},
  keyword      = {Fungal community composition,Infrared spectroscopy,Near-edge X-ray absorption fine structure (NEXAFS) spectroscopy,Nitrogen fertilization,Norway spruce forest,Organic matter decomposition},
  language     = {eng},
  month        = {07},
  pages        = {14},
  publisher    = {Springer},
  series       = {Plant and Soil},
  title        = {Chemical changes in organic matter after fungal colonization in a nitrogen fertilized and unfertilized Norway spruce forest},
  url          = {http://dx.doi.org/10.1007/s11104-017-3324-8},
  year         = {2017},
}