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Gaul, Dirk ; Hertel, Dietrich ; Leuschner, Christoph:
Effects of experimental soil frost on the fine-root system of mature Norway spruce.
In: Journal of Plant Nutrition and Soil Science.
Bd. 171
(2008)
Heft 5
.
- S. 690-698.
ISSN 1436-8730
DOI: https://doi.org/10.1002/jpln.200700284
Abstract
Soil-frost events may influence the dynamics of fine roots and therefore affect root-derived Cfluxes to the soil. We studied the impact of soil frost on the fine-root dynamics of Norway spruce(Picea abies [L.] Karst.) by a replicated snow-removal experiment in a mature forest inSE Germany. Snow removal in the three treatment plots reduced soil temperature significantlywith minima <–5.5°C in the O layer while the snow-covered control plots never reached temperaturesbelow the freezing point. Sequential soil coring in the O layer at the beginning and atthe end of the soil-frost period as well as after thawing revealed that the soil frost treatment increasedfine-root mortality by 29%. However, enhanced fine-root production in the snowremovalplots nearly compensated for the fine-root losses caused by low temperatures. Thesefindings were confirmed by minirhizotron observations in the O layer and the upper 25cm of themineral soil showing that relative fine-root loss was by far higher in the snow-removal plots thanin the control plots. Compensatory fine-root production in the snow-removal plots exceeded finerootproduction in the control plots during a period of 8 weeks after the soil frost application by39% in the O layer while it was similar in both plot types in the mineral soil. Sequential coringand minirhizotron observations led to substantially different fine root–longevity estimates for thesoil frost period. However, in both cases, the snow-removal treatment was characterized by asignificant reduction in root longevity indicating a faster fine-root turnover. As a consequence,experimental soil frost enhanced the C input to the soil via root death at our study site by approx.42 g m–2 and stimulated the C investment towards the root system of the spruce trees due to ahigher sink activity.Key words: fine-root biomass / fine-root longevity / minirhizotron / root necromass / sequential coring / snowremoval
Weitere Angaben
| Publikationsform: | Artikel in einer Zeitschrift |
|---|---|
| Begutachteter Beitrag: | Ja |
| Zusätzliche Informationen: | BAYCEER64035 |
| Institutionen der Universität: | Forschungseinrichtungen > Forschungszentren > Bayreuther Zentrum für Ökologie und Umweltforschung - BayCEER Forschungseinrichtungen Forschungseinrichtungen > Forschungszentren |
| Titel an der UBT entstanden: | Ja |
| Themengebiete aus DDC: | 500 Naturwissenschaften und Mathematik |
| Eingestellt am: | 07 Aug 2015 06:59 |
| Letzte Änderung: | 07 Aug 2015 06:59 |
| URI: | https://eref.uni-bayreuth.de/id/eprint/17756 |