Journal
SOIL BIOLOGY & BIOCHEMISTRY
Volume 43, Issue 3, Pages 551-558Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.soilbio.2010.11.022
Keywords
Rhizosphere; Root exudates; Tree girdling; Microbial community composition; Phospholipid fatty acids; Microbial processes; Extracellular enzymes
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Funding
- Austrian Science Fund (FWF) [P18495-B03]
- Austrian Science Fund (FWF) [P18495] Funding Source: Austrian Science Fund (FWF)
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Plant roots strongly influence C and N availability in the rhizosphere via rhizodeposition and uptake of nutrients. This study aimed at investigating the effect of resource availability on microbial processes and community structure in the rhizosphere. We analyzed C and N availability, as well as microbial processes and microbial community composition in rhizosphere soil of European beech and compared it to the bulk soil. Additionally, we performed a girdling experiment in order to disrupt root exudation into the soil. By this novel approach we were able to demonstrate that enhanced resource availability positively affected N mineralization and hydrolytic enzyme activities in the rhizosphere, but negatively affected nitrification rates and oxidative enzyme activities, which are involved in the degradation of soil organic matter. Both rhizosphere effects on N mineralization and oxidative enzyme activities disappeared in the girdling treatment. Microbial community structure in the rhizosphere, assessed by phospholipid fatty acid analysis, differed only slightly from bulk soil but was markedly altered by the girdling treatment, indicating additional effects of the girdling treatment beyond the reduction of root exudation. Differences in oxidative enzyme activities and nitrification rates between rhizosphere soil and bulk soil, however, suggest considerable differences in the (functional) microbial community composition. (C) 2010 Elsevier Ltd. All rights reserved.
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