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Frost damage and winter nitrogen uptake by the grass Poa pratensis L. : consequences for vegetative versus reproductive growth

Title data

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. Vol. 213 (2012) Issue 11 . - pp. 1739-1747.
ISSN 1573-5052
DOI: https://doi.org/10.1007/s11258-012-0127-0

Abstract in another language

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.

Further data

Item Type: Article in a journal
Refereed: Yes
Additional notes: BAYCEER110027
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences > Chair Biogeography
Research Institutions > Research Centres > Bayreuth Center of Ecology and Environmental Research- BayCEER
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences > Professorship Disturbance Ecology
Faculties
Faculties > Faculty of Biology, Chemistry and Earth Sciences
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences
Research Institutions
Research Institutions > Research Centres
Result of work at the UBT: Yes
DDC Subjects: 500 Science
Date Deposited: 29 Apr 2015 15:42
Last Modified: 29 Apr 2015 15:42
URI: https://eref.uni-bayreuth.de/id/eprint/11667