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Extreme events and vegetation type effects on microbial community composition and nutrient disposition

Marco Tulio Lara-Jiménez1, Christina Bogner2, Bruno Glaser3
1 Soil physics, Bayreuth University
2 Ecological modeling, Bayreuth University
3 Soil biogechemistry, Martin-Luther University, Halle

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02.10.2014, 11:45-12:00, H36, NW III


Extreme drought and rain are important ecological stressors. Their effects on soil microbial structure and nutrient availability in two vegetation types of grassland were studied. We use permutations test for linear models to determine the significance in the variation of biochemical properties and a multiple responses linear model with permutations on single PLFAs as markers to access the microbial community of bacteria, fungi, actinimycetes, micorriza and protozoa rather than the common approach of using PCA to group PLFAs with similar eco-physiological properties. The biochemical profile indicates that extreme drought reduces microbial biomass, DOC, DON and NH4 significantly regardless the vegetation type and the year of sampling. At the contrary the analysis of individual PLFA shows that rain produce an accentuated change to the whole microbial community structure; meanwhile drought affected mostly bacteria composition. This change occurs regardless of the effect of grassland type.

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last modified 2014-09-09