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Title of Journal: Plant Soil

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Abbravation: Plant and Soil

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Springer Netherlands

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DOI

10.1002/app.1991.070420214

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ISSN

1573-5036

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Higher plant diversity enhances soil stability in

Authors: Mandy Pohl Dominik Alig Christian Körner Christian Rixen
Publish Date: 2009/02/04
Volume: 324, Issue: 1-2, Pages: 91-102
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Abstract

Plant diversity is hypothesised to increase soil stability by increasing the diversity of root types To test this hypothesis we took soil cores from machinegraded ski slopes and from the adjacent undisturbed vegetation as a control We quantified aggregate stability as an indicator for soil stability in relation to 1 abiotic soil properties 2 aboveground vegetation characteristics and 3 root parameters From the three groups of variables the number of plant species root density RD and sand content showed the highest correlation with soil aggregate stability and explained 54 of its variance In variance partitioning the number of plant species was the most relevant factor explaining 19 of the variance in aggregate stability Further it explained another 11 through shared effects with RD and sand content An additional 8 was explained through the shared influence with sand content Plant species showing the highest correlation with overall diversity were from different functional groups grasses forbs and shrubs meaning that beneficial effects can not only be assigned to one specific functional group but to the combination of several groups Our data demonstrate the positive effect of plant diversity on aggregate stability We suggest that high plant diversity is one of the most relevant factors for enhancing soil stability at disturbed sites at high elevationWe would like to thank the Swiss MAVAFoundation and the Swiss Federal Research Institute WSL for the financial support We thank Nils Peuse for the great assistance in the field as well as Adrian Käser and Niklaus Hardegger for their valuable laboratory work Frank Graf Melissa Martin and the two anonymous referees helped improve this manuscript with useful comments

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