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Schmitt, Andrea ; Glaser, Bruno:
Organic matter dynamics in a temperate forest as influenced by soil frost.
In: Journal of Plant Nutrition and Soil Science.
Bd. 174
(2011)
Heft 5
.
- S. 754-764.
ISSN 1436-8730
DOI: https://doi.org/10.1002/jpln.201100009
Abstract
In the future, climate models predict an increase in global surface temperature and during wintera changing of precipitation from less snowfall to more raining. Without protective snow cover,freezing can be more intensive and can enter noticeably deeper into the soil with effects on Ccycling and soil organic matter (SOM) dynamics. We removed the natural snow cover in aNorway spruce forest in the Fichtelgebirge Mts. during winter from late December 2005 untilmiddle of February 2006 on three replicate plots. Hence, we induced soil frost to 15cm depth (ata depth of 5 cm below surface up to –5°C) from January to April 2006, while the snow-coveredcontrol plots never reached temperatures < 0°C. Quantity and quality of SOM was followed bytotal organic C and biomarker analysis. While soil frost did not influence total organic-C andlignin concentrations, the decomposition of vanillyl monomers (Ac/Ad)V and the microbial-sugarconcentrations decreased at the end of the frost period, these results confirm reduced SOMmineralization under frost. Soil microbial biomass was not affected by the frost event orrecovered more quickly than the accumulation of microbial residues such as microbial sugarsdirectly after the experiment. However, in the subsequent autumn, soil microbial biomasswas significantly higher at the snow-removal (SR) treatments compared to the controldespite lower CO2 respiration. In addition, the water-stress indicator (PLFA [cy17:0 + cy19:0] /[16:1x7c + 18:1x7c]) increased. These results suggest that soil microbial respiration and thereforethe activity was not closely related to soil microbial biomass but more strongly controlled bysubstrate availability and quality. The PLFA pattern indicates that fungi are more susceptible tosoil frost than bacteria.
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| Publikationsform: | Artikel in einer Zeitschrift |
|---|---|
| Begutachteter Beitrag: | Ja |
| Zusätzliche Informationen: | BAYCEER101574 |
| Institutionen der Universität: | Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Geowissenschaften > Lehrstuhl Bodenphysik 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: | 29 Jun 2015 06:09 |
| Letzte Änderung: | 23 Nov 2015 18:04 |
| URI: | https://eref.uni-bayreuth.de/id/eprint/15493 |