at Google ScholarTitle 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 Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences > Former Professors |
| 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 |