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Repeated freeze-thaw events affect leaching losses of nitirogen and dissolved organic matter in a forest soil

Title data

Hentschel, Kerstin ; Borken, Werner ; Matzner, Egbert:
Repeated freeze-thaw events affect leaching losses of nitirogen and dissolved organic matter in a forest soil.
In: Journal of Plant Nutrition and Soil Science. Vol. 171 (2008) Issue 5 . - pp. 699-706.
ISSN 1436-8730
DOI: https://doi.org/10.1002/jpln.200700154

Abstract in another language

Freezing and thawing may substantially influence the rates of C and N cycling in soils and soil frost was proposed to induce NO3- losses with seepage from forest ecosystems. Here we test the hypothesis that freezing/thawing triggers N and dissolved organic matter release from a forest soil after thawing and that low freezing temperatures enhance the effect. Undisturbed soil columns were taken from a soil under a Norway spruce site either comprising only O horizons or O horizons + mineral soil horizons. The columns were subjected to 3 cycles of freezing/thawing at temperatures of -3°C, -8°C, -13°C. The control columns were kept at constant +5°C. Following the frost events, the columns were irrigated for 20 days at a rate of 4 mm d-1. Percolates were analyzed for total N, mineral N and dissolved organic carbon (DOC). The total amount of mineral N extracted from the O horizons in the control amounted to 8.6 g N m-2 during the experimental period of 170 days. Frost reduced the amount of mineral N leached from the soil columns with -8°C and -13°C being most effective. In these treatments only 3.1 and 4.0 g N m-2 were extracted from the O horizons. Net nitrification was more negatively affected than net ammonification. Severe soil frost increased the release of DOC from the O horizons, but the effect was only observed in the 1st freeze/thaw cycle. We found no evidence for lysis of microorganisms after soil frost. Our experiment did not confirm the hypothesis that soil frost increases N mineralization after thawing. The total amount of additionally released DOC was rather low in relation to the expected annual fluxes.

Further data

Item Type: Article in a journal
Refereed: Yes
Additional notes: BAYCEER51939
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences > Chair Soil Ecology
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences > Former Professors > Chair Soil Ecology - Univ.-Prof. Dr. Egbert Matzner
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: 11 Sep 2015 06:32
Last Modified: 11 Sep 2015 06:33
URI: https://eref.uni-bayreuth.de/id/eprint/19094