Titlebar

Bibliografische Daten exportieren
Literatur vom gleichen Autor
plus auf ERef Bayreuth
plus bei Google Scholar

 

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

Titelangaben

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. Bd. 171 (2008) Heft 5 . - S. 699-706.
ISSN 1436-8730
DOI: https://doi.org/10.1002/jpln.200700154

Abstract

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.

Weitere Angaben

Publikationsform: Artikel in einer Zeitschrift
Begutachteter Beitrag: Ja
Zusätzliche Informationen: BAYCEER51939
Institutionen der Universität: Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Geowissenschaften > Lehrstuhl Bodenökologie
Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Geowissenschaften > Ehemalige Professoren > Lehrstuhl Bodenökologie - Univ.-Prof. Dr. Egbert Matzner
Forschungseinrichtungen > Forschungszentren > Bayreuther Zentrum für Ökologie und Umweltforschung - BayCEER
Fakultäten
Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften
Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Geowissenschaften
Forschungseinrichtungen
Forschungseinrichtungen > Forschungszentren
Titel an der UBT entstanden: Ja
Themengebiete aus DDC: 500 Naturwissenschaften und Mathematik
Eingestellt am: 11 Sep 2015 06:32
Letzte Änderung: 11 Sep 2015 06:33
URI: https://eref.uni-bayreuth.de/id/eprint/19094