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N uptake and growth responses to sub-lethal freezing in the grass Poa pratensis

Title data

Malyshev, Andrey ; Henry, Hugh A. L.:
N uptake and growth responses to sub-lethal freezing in the grass Poa pratensis.
In: Plant and Soil. Vol. 360 (2012) Issue 1-2 . - pp. 175-185.
ISSN 1573-5036
DOI: https://doi.org/10.1007/s11104-012-1233-4

Abstract in another language

Climate warming has the potential to increase both the exposure and vulnerability of grass roots to frost in temperate regions by reducing snow cover and altering the timing of cold acclimation. Despite a strong research focus on the direct effects of freezing on grass mortality, the direct sub-lethal effects of freezing on grass performance have not been well-characterized. We examined sub-lethal responses of the grass Poa pratensis to variation in the timing, severity, rate and length of freezing.We assessed short term root functional responses (15N uptake) and longer term plant growth responses to freezing administered both under controlled conditions in a refrigerated incubator, and in the field by manipulating snow and litter cover.In fall and spring, 15N uptake declined in response to 1 day of freezing down to −10 °C or to 3 days of freezing at −5 °C, whereas in winter, 15N uptake was insensitive to freezing. Long term growth responses were similar, with reduced growth only occurring for grasses frozen for 3 days at −5 °C in spring, but not for grasses frozen in fall or winter. Snow and litter removal intensified soil freezing over winter, but did not significantly affect plant growth.Our results demonstrate that while P. pratensis is relatively tolerant to frost damage over winter, it may be vulnerable to sub-lethal frost effects in fall, and particularly in spring. These sub-lethal effects occur at temperatures approximately 15–20 °C warmer than the published LT50 values for this species.

Further data

Item Type: Article in a journal
Refereed: Yes
Additional notes: BAYCEER110024
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/11668