Authors: Agnes Rehmus Moritz Bigalke Carlos Valarezo Julio Mora Castillo Wolfgang Wilcke
Publish Date: 2014/06/06
Volume: 382, Issue: 1-2, Pages: 301-315
Abstract
An hydroponic doseresponse experiment was conducted Seedlings of Cedrela odorata L Heliocarpus americanus L and Tabebuia chrysantha Jacq G Nicholson were treated with 0 300 600 1200 and 2400 μ M Al and an organic layer leachate Doseresponse curves were generated for root and shoot morphologic properties to determine effective concentrations ECShoot biomass and healthy leaf area decreased by 44 to 83 at 2400 μ M Al root biomass did not respond C odorata declined by 51 H americanus or was stimulated at low Al concentrations of 300 μ M T chrysantha EC10 ie reduction by 10 values of Al for total biomass were 315 μ M C odorata 219 μ M H americanus and 368 μ M T chrysantha Helicarpus americanus a fast growing pioneer tree species was most sensitive to Al toxicity Negative effects were strongest if plants grew in organic layer leachate indicating limitation of plant growth by nutrient scarcity rather than Al toxicityWe thank Karoline Klaus Katharina Kitzinger Jose Luis Peña Caivinagua and Orly Mendoza Aguirre for support in set up of the experiment Rainer Rees Mertins and Bernd Felderer ETH Zurich CH for support with WinRhizo Nature and Culture International in Loja EC for providing the study area and the research station Ecuadorian authorities for the research permit and the German Research Foundation DFG for funding FOR 816 Wi 1601/82
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