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Malyshev, Andrey ; Henry, Hugh A. L.:
Frost damage and winter nitrogen uptake by the grass Poa pratensis L. : consequences for vegetative versus reproductive growth.
In: Plant Ecology.
Bd. 213
(2012)
Heft 11
.
- S. 1739-1747.
ISSN 1573-5052
DOI: https://doi.org/10.1007/s11258-012-0127-0
Abstract
Frost damage can decrease nitrogen uptake by grasses over winter, and it can also decrease biomass productionover the following growing season. However, it is not clear to what extent reduced nitrogen uptake over winterdecreases grass production, or whether is it merely a symptom of root damage. We examined the growthresponse of the grass Poa pratensis L. (Kentucky bluegrass) to variation in the timing of freezing and nitrogenavailability over winter in London, Ontario, Canada. All tillers were transplanted into untreated soil in earlyspring, and at peak seed maturation, root, shoot, and reproductive biomass were measured. There was aninteraction between freezing and increased winter nitrogen availability, whereby nitrogen addition increasedtiller biomass under ambient temperatures, but decreased tiller biomass in combination with a late winterfreeze. The nitrogen response of ambient temperature tillers occurred primarily via increased seed production,whereas for frozen tillers seed production was generally absent. Our results support the hypothesis thatnitrogen uptake over winter can increase growing season productivity in P. pratensis , but also demonstratethat increased nitrogen availability increases tiller vulnerability to frost. These results have important implications for grass responses to the alteration of soil freezing dynamics with climate change.
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| Publikationsform: | Artikel in einer Zeitschrift |
|---|---|
| Begutachteter Beitrag: | Ja |
| Zusätzliche Informationen: | BAYCEER110027 |
| Institutionen der Universität: | Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Geowissenschaften > Lehrstuhl Biogeographie Forschungseinrichtungen > Forschungszentren > Bayreuther Zentrum für Ökologie und Umweltforschung - BayCEER Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Geowissenschaften > Professur Störungsökologie Fakultäten Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Geowissenschaften Forschungseinrichtungen Forschungseinrichtungen > Forschungszentren |
| Titel an der UBT entstanden: | Ja |
| Themengebiete aus DDC: | 500 Naturwissenschaften und Mathematik |
| Eingestellt am: | 29 Apr 2015 15:42 |
| Letzte Änderung: | 29 Apr 2015 15:42 |
| URI: | https://eref.uni-bayreuth.de/id/eprint/11667 |