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Soil fungi appear to have a retarding rather than a stimulating role on soil apatite weathering

Smits, Mark LU ; Johansson, Leif LU and Wallander, Håkan LU (2014) In Plant and Soil 385(1-2). p.217-228
Abstract
Aims Vegetation stimulates, in general, soil mineral weathering. It has been hypothesized that plant-associated microorganisms, especially ectomycorrhizal fungi play a major role in this process. We studied apatite dissolution in a vegetation gradient in southern Norway to test the role of ectomycorrhizal vegetation on mineral weathering. Methods A natural occurring lead contamination, probably present since the last glaciation, caused a gradient from bare soil, via sparse grass to healthy spruce forest. We measured apatite content, soil solution chemistry, delta C-13, delta N-15, C, N and ergosterol content in soil profiles along the gradient. Results The apatite loss for each soil depth could be described by the same proton-based,... (More)
Aims Vegetation stimulates, in general, soil mineral weathering. It has been hypothesized that plant-associated microorganisms, especially ectomycorrhizal fungi play a major role in this process. We studied apatite dissolution in a vegetation gradient in southern Norway to test the role of ectomycorrhizal vegetation on mineral weathering. Methods A natural occurring lead contamination, probably present since the last glaciation, caused a gradient from bare soil, via sparse grass to healthy spruce forest. We measured apatite content, soil solution chemistry, delta C-13, delta N-15, C, N and ergosterol content in soil profiles along the gradient. Results The apatite loss for each soil depth could be described by the same proton-based, dissolution function over the whole vegetation gradient. The deviation fromthe 30-40 cm depth pH model showed, in the top 20 cm, a negative correlation with ergosterol, and a positive correlation with delta C-13. These correlations could reflect an inhibiting effect of biotic activity through the production of large weight organic acids and degradation of low molecular weight organic acids. Conclusions Vegetation accelerates apatite dissolution by acidifying the soil solution, but soil fungi appeared to have a retarding, rather than an enhancing effect on this process. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Apatite, Fungi, Vegetation, Weathering, DOM
in
Plant and Soil
volume
385
issue
1-2
pages
217 - 228
publisher
Springer
external identifiers
  • wos:000345283400016
  • scopus:84912044167
ISSN
0032-079X
DOI
10.1007/s11104-014-2222-6
language
English
LU publication?
yes
id
59f73409-45a6-4619-a834-75ccc675cc52 (old id 4982957)
date added to LUP
2015-01-27 09:51:30
date last changed
2017-08-20 04:06:39
@article{59f73409-45a6-4619-a834-75ccc675cc52,
  abstract     = {Aims Vegetation stimulates, in general, soil mineral weathering. It has been hypothesized that plant-associated microorganisms, especially ectomycorrhizal fungi play a major role in this process. We studied apatite dissolution in a vegetation gradient in southern Norway to test the role of ectomycorrhizal vegetation on mineral weathering. Methods A natural occurring lead contamination, probably present since the last glaciation, caused a gradient from bare soil, via sparse grass to healthy spruce forest. We measured apatite content, soil solution chemistry, delta C-13, delta N-15, C, N and ergosterol content in soil profiles along the gradient. Results The apatite loss for each soil depth could be described by the same proton-based, dissolution function over the whole vegetation gradient. The deviation fromthe 30-40 cm depth pH model showed, in the top 20 cm, a negative correlation with ergosterol, and a positive correlation with delta C-13. These correlations could reflect an inhibiting effect of biotic activity through the production of large weight organic acids and degradation of low molecular weight organic acids. Conclusions Vegetation accelerates apatite dissolution by acidifying the soil solution, but soil fungi appeared to have a retarding, rather than an enhancing effect on this process.},
  author       = {Smits, Mark and Johansson, Leif and Wallander, Håkan},
  issn         = {0032-079X},
  keyword      = {Apatite,Fungi,Vegetation,Weathering,DOM},
  language     = {eng},
  number       = {1-2},
  pages        = {217--228},
  publisher    = {Springer},
  series       = {Plant and Soil},
  title        = {Soil fungi appear to have a retarding rather than a stimulating role on soil apatite weathering},
  url          = {http://dx.doi.org/10.1007/s11104-014-2222-6},
  volume       = {385},
  year         = {2014},
}