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Title of Journal: Biol Invasions

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Abbravation: Biological Invasions

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Springer Netherlands

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DOI

10.1002/eej.4391060206

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1573-1464

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Light interception principally drives the understo

Authors: Marion BottollierCurtet JeanYves Charcosset Franck Poly AnneMarie PlantyTabacchi Eric Tabacchi
Publish Date: 2011/12/30
Volume: 14, Issue: 7, Pages: 1445-1458
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Abstract

Since several decades American boxelder Acer negundo is replacing white willow Salix alba riparian forests along southern European rivers This study aims to evaluate the consequences of boxelder invasion on understory community in riparian areas We determined the understory species richness composition and biomass in boxelder and white willow stands located in three riparian forests representative of three rivers with distinct hydrological regimes We investigated correlation of these variables to soil moisture and particle size main soil nutrient stocks potential nitrification and denitrification tree canopy cover and photosynthetic active radiation PAR at the ground level A greenhouse experiment was then conducted to identify the causal factors responsible for changes in the understory The effect of soil type PAR level and water level on the growth and the biomass production of Urtica dioica were examined A lower plant species richness and biomass and a modification of community composition were observed for boxelder understory in all sites regardless of their environmental characteristics The strongest modification that follows boxelder invasion was the decline in U dioica the dominant species of the white willow forest understory These differences were mainly correlated with a lower incident PAR under boxelder canopy The greenhouse experiment identified PAR level as the main factor responsible for the changes in U dioica stem number and biomass Our results indicate that adult boxelder acts as an ecosystem engineer that decreases light availability The opportunistic invasion by boxelder leads to important understory changes which could alter riparian ecosystem functioningWe thank N Guillaumaud for her technical assistance with measuring nitrifying and denitrifying activity J Sylvestre for his help for the greenhouse experiment and J Moro for making the field access easier The comments and suggestions of the reviewers improved the manuscript We thank Dr B Loveall for English proofreading of the manuscript M BottollierCurtet was supported by a French MESR fellowship

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