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Repeated freeze-thaw cycles changed organic matter quality in a temperate forest soil

Title data

Schmitt, Andrea ; Glaser, Bruno ; Borken, Werner ; Matzner, Egbert:
Repeated freeze-thaw cycles changed organic matter quality in a temperate forest soil.
In: Journal of Plant Nutrition and Soil Science. Vol. 171 (2008) Issue 5 . - pp. 707-718.
ISSN 1436-8730
DOI: https://doi.org/10.1002/jpln.200700334

Abstract in another language

Under temperate climate, the frequency of extreme weather events such as intensive freezing or frequent thawing periods during winter might increase in the future. It was shown that frost and subsequent thawing may affect the fluxes of C and N in soils. In a laboratory study, we investigated the effect of frost intensity and repeated freeze/thaw cycles on the quality and quantity of soil organic matter (SOM) in a Haplic Podzol from a Norway spruce forest. Undisturbed soil columns comprising organic layer and top mineral soil were treated as followed: Control (+5 °C), frost at –3 °C, –8 °C and –13 °C. After a two-week freezing period, frozen soils were thawed at +5 °C and irrigated with 80 mm water at a rate of 4 mm per day. Lignin contents were not significantly affected by repeated freeze/thaw cycles. Phospholipid fatty acid (PLFA) contents decreased in the mineral soil and PLFA patterns indicate that fungi are more susceptible to soil frost than bacteria. Amounts of both plant and microbial sugars generally decreased with increasing frost intensity. These changes cannot be explained by increased mineralization of sugars or by leaching with DOM nor by a decreased microbial activity and thus sugar production with increasing frost intensity. Also physical stabilization of sugars due to frost-induced changes in soil structure can be ruled out as sugar extraction was carried out on ground bulk soil. Therefore, the only possible explanation for the disappearance of plant and microbial sugars upon soil freezing are chemical alterations of sugar molecules leading to SOM stabilization.

Further data

Item Type: Article in a journal
Refereed: Yes
Additional notes: BAYCEER55052
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences > Chair Soil Physics
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences > Chair Soil Ecology
Research Institutions > Research Centres > Bayreuth Center of Ecology and Environmental Research- BayCEER
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: 06 Jul 2015 10:25
Last Modified: 06 Jul 2015 10:25
URI: https://eref.uni-bayreuth.de/id/eprint/15945