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Bacterial and fungal growth on different plant litter in Mediterranean soils : Effects of C/N ratio and soil pH

Grosso, F.; Bååth, E. LU and De Nicola, F. (2016) In Applied Soil Ecology 108. p.1-7
Abstract

Plant litter represents an important source of nutrients and energy for soil microorganisms, but will also selectively affect which organism group, fungi or bacteria, that will be favoured during decomposition. The balance of fungal to bacterial growth will furthermore be affected by soil chemistry like pH. A laboratory experiment was carried out using two different Mediterranean forest soils differing in pH, adding five types of litter varying in C/N ratio from 15 to 75, including the major litter type from the two soils. Growth of bacteria (using the leucine incorporation technique) and fungi (using the acetate into ergosterol incorporation technique) was then followed during 6 weeks. The balance of fungal to bacterial growth was... (More)

Plant litter represents an important source of nutrients and energy for soil microorganisms, but will also selectively affect which organism group, fungi or bacteria, that will be favoured during decomposition. The balance of fungal to bacterial growth will furthermore be affected by soil chemistry like pH. A laboratory experiment was carried out using two different Mediterranean forest soils differing in pH, adding five types of litter varying in C/N ratio from 15 to 75, including the major litter type from the two soils. Growth of bacteria (using the leucine incorporation technique) and fungi (using the acetate into ergosterol incorporation technique) was then followed during 6 weeks. The balance of fungal to bacterial growth was positively affected by litter with increasing C/N ratio, while the C availability, as judged by evolved CO2, did not have any influence. Furthermore, low pH in the soil further favoured fungal growth, irrespective of the litter type. Despite differences in fungal to bacterial growth this appeared to have little influence on respiration rates from the added litter, suggesting functional redundancy. Our results highlight how both initial soil conditions (pH) and litter composition (C/N ratio) independently affects fungal and bacterial growth during decomposition.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Ac-in-erg, Biomass, Leucine, Litter decomposition, Mediterranean forest, Microbial growth
in
Applied Soil Ecology
volume
108
pages
7 pages
publisher
Elsevier
external identifiers
  • Scopus:84980335961
ISSN
0929-1393
DOI
10.1016/j.apsoil.2016.07.020
language
English
LU publication?
yes
id
39a0c163-9445-4e40-9b85-7ec99c8e6d7b
date added to LUP
2016-10-12 12:36:52
date last changed
2016-10-12 12:36:52
@misc{39a0c163-9445-4e40-9b85-7ec99c8e6d7b,
  abstract     = {<p>Plant litter represents an important source of nutrients and energy for soil microorganisms, but will also selectively affect which organism group, fungi or bacteria, that will be favoured during decomposition. The balance of fungal to bacterial growth will furthermore be affected by soil chemistry like pH. A laboratory experiment was carried out using two different Mediterranean forest soils differing in pH, adding five types of litter varying in C/N ratio from 15 to 75, including the major litter type from the two soils. Growth of bacteria (using the leucine incorporation technique) and fungi (using the acetate into ergosterol incorporation technique) was then followed during 6 weeks. The balance of fungal to bacterial growth was positively affected by litter with increasing C/N ratio, while the C availability, as judged by evolved CO<sub>2</sub>, did not have any influence. Furthermore, low pH in the soil further favoured fungal growth, irrespective of the litter type. Despite differences in fungal to bacterial growth this appeared to have little influence on respiration rates from the added litter, suggesting functional redundancy. Our results highlight how both initial soil conditions (pH) and litter composition (C/N ratio) independently affects fungal and bacterial growth during decomposition.</p>},
  author       = {Grosso, F. and Bååth, E. and De Nicola, F.},
  issn         = {0929-1393},
  keyword      = {Ac-in-erg,Biomass,Leucine,Litter decomposition,Mediterranean forest,Microbial growth},
  language     = {eng},
  month        = {12},
  pages        = {1--7},
  publisher    = {ARRAY(0x898f940)},
  series       = {Applied Soil Ecology},
  title        = {Bacterial and fungal growth on different plant litter in Mediterranean soils : Effects of C/N ratio and soil pH},
  url          = {http://dx.doi.org/10.1016/j.apsoil.2016.07.020},
  volume       = {108},
  year         = {2016},
}