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Minor response of gross N turnover and N leaching to drying, rewetting and irrigation in the topsoil of a Norway spruce forest

Titelangaben

Chen, Yao-Te ; Bogner, Christina ; Borken, Werner ; Stange, Claus Florian ; Matzner, Egbert:
Minor response of gross N turnover and N leaching to drying, rewetting and irrigation in the topsoil of a Norway spruce forest.
In: European Journal of Soil Science. Bd. 62 (2011) Heft 5 . - S. 709-717.
ISSN 1351-0754
DOI: https://doi.org/10.1111/j.1365-2389.2011.01388.x

Abstract

Forest floors in the temperate climate zone are frequently subjected to strong changes in soil moisture, but theconsequences for the soil N cycle are poorly known. In a field experiment we tested the hypotheses that soildrying leads to a decrease of gross N turnover and that natural rewetting causes a pulse of gross N turnoverand an increase of N leaching from the forest floor. A further hypothesis was that optimal water availabilityinduced by irrigation causes maximum N turnover and N leaching. Replicated control, throughfall exclusionand irrigation plots were established in a Norway spruce forest to simulate different precipitation patternsduring a growing season. Gross N turnover rates were determined in undisturbed soil cores from Oi + Oeand Oa + EA horizons by the 15N pool dilution technique. Forest floor percolates were periodically collectedby suction plates.After 142 mm throughfall was excluded, the median soil water potential at the throughfall exclusion plotsincreased from pF 1.9 to 4.5 in the Oi + Oe horizon and from pF 1.8 to 3.8 in the Oa + EA horizon.Gross ammonification ranged from 14 to 45 mg N kg−1 soil day−1 in the Oi + Oe horizon and from 4.6 to11.4 mg N kg−1 soil day−1 in the Oa + EA horizon. Gross ammonification of both horizons was smallestin the throughfall exclusion plots during the manipulation, but the differences between all treatments werenot statistically significant. Gross nitrification in both horizons was very small, ranging from 1.6 to 11.1mg N kg−1 soil day−1. No effects of decreasing water potential and rewetting on gross nitrification rates wereobserved because of the small rates and huge spatial variations. Irrigation had no effect as the differencesfrom the control in soil water potential remained small. N leaching from the forest floor was not affected bythe treatments. Our findings suggest that ammonification in forest floors continues at considerable rates evenat small water potentials. The hypotheses of increased N turnover and N leaching following rewetting of dryforest floor or irrigation were not confirmed.

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Publikationsform: Artikel in einer Zeitschrift
Begutachteter Beitrag: Ja
Zusätzliche Informationen: BAYCEER93155
Institutionen der Universität: Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Geowissenschaften > Lehrstuhl Ökologische Modellbildung
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
Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Geowissenschaften > Ehemalige Professoren
Titel an der UBT entstanden: Ja
Themengebiete aus DDC: 500 Naturwissenschaften und Mathematik
Eingestellt am: 29 Jun 2015 06:09
Letzte Änderung: 22 Apr 2016 13:42
URI: https://eref.uni-bayreuth.de/id/eprint/15491