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Organic matter dynamics in a temperate forest as influenced by soil frost

Title data

Schmitt, Andrea ; Glaser, Bruno:
Organic matter dynamics in a temperate forest as influenced by soil frost.
In: Journal of Plant Nutrition and Soil Science. Vol. 174 (2011) Issue 5 . - pp. 754-764.
ISSN 1436-8730
DOI: https://doi.org/10.1002/jpln.201100009

Abstract in another language

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.

Further data

Item Type: Article in a journal
Refereed: Yes
Additional notes: BAYCEER101574
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences > Chair Soil Physics
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
Result of work at the UBT: Yes
DDC Subjects: 500 Science
Date Deposited: 29 Jun 2015 06:09
Last Modified: 23 Nov 2015 18:04
URI: https://eref.uni-bayreuth.de/id/eprint/15493