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Increasing abundance of soil fungi is a driver for (15)N enrichment in soil profiles along a chronosequence undergoing isostatic rebound in northern Sweden.

Wallander, Håkan LU ; Mörth, Carl-Magnus and Giesler, Reiner (2009) In Oecologia 160. p.87-96
Abstract
Soil organic material (SOM) is usually enriched in (15)N in deeper soil layers. This has been explained by discrimination against the heavier isotope during decomposition or by the accumulation of (15)N-enriched microbial biomass versus plant biomass in older SOM. In particular, ectomycorrhizal (EM) fungi have been suggested to accumulate in old SOM since this group is among the most (15)N-enriched components of the microbial community. In the present study we investigated the microbial community in soil samples along a chronosequence (7,800 years) of sites undergoing isostatic rebound in northern Sweden. The composition of the microbial community was analyzed and related to the delta(15)N and delta(13)C isotope values of the SOM in soil... (More)
Soil organic material (SOM) is usually enriched in (15)N in deeper soil layers. This has been explained by discrimination against the heavier isotope during decomposition or by the accumulation of (15)N-enriched microbial biomass versus plant biomass in older SOM. In particular, ectomycorrhizal (EM) fungi have been suggested to accumulate in old SOM since this group is among the most (15)N-enriched components of the microbial community. In the present study we investigated the microbial community in soil samples along a chronosequence (7,800 years) of sites undergoing isostatic rebound in northern Sweden. The composition of the microbial community was analyzed and related to the delta(15)N and delta(13)C isotope values of the SOM in soil profiles. A significant change in the composition of the microbial community was found during the first 2,000 years, and this was positively related to an increase in the delta(15)N values of the E and B horizons in the mineral soil. The proportion of fungal phospholipid fatty acids increased with time in the chronosequence and was positively related to the (15)N enrichment of the SOM. The increase in delta(13)C in the SOM was much less than the increase in delta(15)N, and delta(13)C values in the mineral soil were only weakly related to soil age. The C:N ratio and the pH of the soil were important factors determining the composition of the microbial community. We suggest that the N being transported from the soil to aboveground tissue by EM fungi is a driver for (15)N enrichment of soil profiles. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Microbial community, PLFA, Chronosequence, Soil proWle, Ectomycorrhizal fungi
in
Oecologia
volume
160
pages
87 - 96
publisher
Springer
external identifiers
  • wos:000265100500009
  • scopus:64749106545
ISSN
1432-1939
DOI
10.1007/s00442-008-1270-0
language
English
LU publication?
yes
id
366ec554-c824-4c79-a10a-724653f85f69 (old id 1289260)
date added to LUP
2009-02-12 14:39:46
date last changed
2017-09-17 06:28:39
@article{366ec554-c824-4c79-a10a-724653f85f69,
  abstract     = {Soil organic material (SOM) is usually enriched in (15)N in deeper soil layers. This has been explained by discrimination against the heavier isotope during decomposition or by the accumulation of (15)N-enriched microbial biomass versus plant biomass in older SOM. In particular, ectomycorrhizal (EM) fungi have been suggested to accumulate in old SOM since this group is among the most (15)N-enriched components of the microbial community. In the present study we investigated the microbial community in soil samples along a chronosequence (7,800 years) of sites undergoing isostatic rebound in northern Sweden. The composition of the microbial community was analyzed and related to the delta(15)N and delta(13)C isotope values of the SOM in soil profiles. A significant change in the composition of the microbial community was found during the first 2,000 years, and this was positively related to an increase in the delta(15)N values of the E and B horizons in the mineral soil. The proportion of fungal phospholipid fatty acids increased with time in the chronosequence and was positively related to the (15)N enrichment of the SOM. The increase in delta(13)C in the SOM was much less than the increase in delta(15)N, and delta(13)C values in the mineral soil were only weakly related to soil age. The C:N ratio and the pH of the soil were important factors determining the composition of the microbial community. We suggest that the N being transported from the soil to aboveground tissue by EM fungi is a driver for (15)N enrichment of soil profiles.},
  author       = {Wallander, Håkan and Mörth, Carl-Magnus and Giesler, Reiner},
  issn         = {1432-1939},
  keyword      = {Microbial community,PLFA,Chronosequence,Soil proWle,Ectomycorrhizal fungi},
  language     = {eng},
  pages        = {87--96},
  publisher    = {Springer},
  series       = {Oecologia},
  title        = {Increasing abundance of soil fungi is a driver for (15)N enrichment in soil profiles along a chronosequence undergoing isostatic rebound in northern Sweden.},
  url          = {http://dx.doi.org/10.1007/s00442-008-1270-0},
  volume       = {160},
  year         = {2009},
}