Article (Scientific journals)
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.; Verheyen, Kris et al.
2018In Soil Biology and Biochemistry, 127, p. 148 - 155
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Keywords :
Precipitation manipulation; Tree species richness; Sapling; Bacterial growth; Leucine incorporation; Birch effect
Abstract :
[en] 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.
Disciplines :
Environmental sciences & ecology
Phytobiology (plant sciences, forestry, mycology...)
Author, co-author :
Rahman, Md Masudur ;  Université de Liège - ULiège > Département de Biologie, Ecologie et Evolution > Ecologie végétale et microbienne
Hicks, Lettice C.
Verheyen, Kris
Rousk, Johannes
Carnol, Monique  ;  Université de Liège - ULiège > Département de Biologie, Ecologie et Evolution > Ecologie végétale et microbienne
Language :
English
Title :
Effects of drought legacy and tree species admixing on bacterial growth and respiration in a young forest soil upon drying and rewetting
Publication date :
2018
Journal title :
Soil Biology and Biochemistry
ISSN :
0038-0717
eISSN :
1879-3428
Publisher :
Elsevier, United Kingdom
Volume :
127
Pages :
148 - 155
Peer reviewed :
Peer Reviewed verified by ORBi
Name of the research project :
FORBIO Climate- Adaptation potential of biodiverse forests in the face of climate change
Funders :
BELSPO - SPP Politique scientifique - Service Public Fédéral de Programmation Politique scientifique
Available on ORBi :
since 02 October 2018

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