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Effects of drought legacy and tree species admixing on bacterial growth and respiration in a young forest soil upon drying and rewetting

Rahman, Md Masudur; Hicks, Lettice C. LU ; Verheyen, Kris; Rousk, Johannes LU and Carnol, Monique (2018) In Soil Biology and Biochemistry 127. p.148-155
Abstract

In the context of future climate change, the flush of CO2 emissions from soils after drying-rewetting events could have a strong impact on the terrestrial carbon balance. Mixed forests may be more resistant and resilient to drought events compared to monocultures, and as such may modulate the effects of drought on soil functioning belowground. We investigated the influence of mixed planting and drought legacy on respiration and bacterial growth rates (3H Leucine incorporation) in response to drying-rewetting. Soils were sampled from a 7-year old tree diversity experiment (FORBIO), where oak (Quercus robur L.) trees admixed with one or three other tree species were subjected to ∼50% precipitation reduction for 2... (More)

In the context of future climate change, the flush of CO2 emissions from soils after drying-rewetting events could have a strong impact on the terrestrial carbon balance. Mixed forests may be more resistant and resilient to drought events compared to monocultures, and as such may modulate the effects of drought on soil functioning belowground. We investigated the influence of mixed planting and drought legacy on respiration and bacterial growth rates (3H Leucine incorporation) in response to drying-rewetting. Soils were sampled from a 7-year old tree diversity experiment (FORBIO), where oak (Quercus robur L.) trees admixed with one or three other tree species were subjected to ∼50% precipitation reduction for 2 years (“drought legacy”). Respiration increased immediately after rewetting, whereas bacterial growth only started after a distinct lag phase of ca. 7 h. A legacy of drought reduced bacterial growth and respiration rates upon rewetting, however tree species admixing did not modulate the drought legacy effect. Our results suggest that prolonged decrease in precipitation may lead to a reduced CO2 pulse upon drying-rewetting and admixing up to three tree species with oak in a young afforestation would not alleviate drought legacy effects on bacterial growth and respiration rates.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Bacterial growth, Birch effect, Leucine incorporation, Precipitation manipulation, Sapling, Tree species richness
in
Soil Biology and Biochemistry
volume
127
pages
8 pages
publisher
Elsevier
external identifiers
  • scopus:85054169757
ISSN
0038-0717
DOI
10.1016/j.soilbio.2018.09.026
language
English
LU publication?
yes
id
ce77a9d3-170c-4509-a2f4-23f632fe07c8
date added to LUP
2018-10-08 12:18:24
date last changed
2019-05-17 12:58:24
@article{ce77a9d3-170c-4509-a2f4-23f632fe07c8,
  abstract     = {<p>In the context of future climate change, the flush of CO<sub>2</sub> emissions from soils after drying-rewetting events could have a strong impact on the terrestrial carbon balance. Mixed forests may be more resistant and resilient to drought events compared to monocultures, and as such may modulate the effects of drought on soil functioning belowground. We investigated the influence of mixed planting and drought legacy on respiration and bacterial growth rates (<sup>3</sup>H Leucine incorporation) in response to drying-rewetting. Soils were sampled from a 7-year old tree diversity experiment (FORBIO), where oak (Quercus robur L.) trees admixed with one or three other tree species were subjected to ∼50% precipitation reduction for 2 years (“drought legacy”). Respiration increased immediately after rewetting, whereas bacterial growth only started after a distinct lag phase of ca. 7 h. A legacy of drought reduced bacterial growth and respiration rates upon rewetting, however tree species admixing did not modulate the drought legacy effect. Our results suggest that prolonged decrease in precipitation may lead to a reduced CO<sub>2</sub> pulse upon drying-rewetting and admixing up to three tree species with oak in a young afforestation would not alleviate drought legacy effects on bacterial growth and respiration rates.</p>},
  author       = {Rahman, Md Masudur and Hicks, Lettice C. and Verheyen, Kris and Rousk, Johannes and Carnol, Monique},
  issn         = {0038-0717},
  keyword      = {Bacterial growth,Birch effect,Leucine incorporation,Precipitation manipulation,Sapling,Tree species richness},
  language     = {eng},
  pages        = {148--155},
  publisher    = {Elsevier},
  series       = {Soil Biology and Biochemistry},
  title        = {Effects of drought legacy and tree species admixing on bacterial growth and respiration in a young forest soil upon drying and rewetting},
  url          = {http://dx.doi.org/10.1016/j.soilbio.2018.09.026},
  volume       = {127},
  year         = {2018},
}