Aluminum toxicity to tropical montane forest tree seedlings in southern Ecuador: response of biomass and plant morphology to elevated Al concentrations

Rehmus, Agnes; Bigalke, Moritz; Valarezo, Carlos; Castillo, Julio Mora; Wilcke, Wolfgang (2014). Aluminum toxicity to tropical montane forest tree seedlings in southern Ecuador: response of biomass and plant morphology to elevated Al concentrations. Plant and Soil, 382(1-2), pp. 301-315. Springer 10.1007/s11104-014-2110-0

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In acid tropical forest soils (pH < 5.5) increased mobility of aluminum might limit aboveground productivity. Therefore, we evaluated Al phytotoxicity of three native tree species of tropical montane forests in southern Ecuador. An hydroponic dose-response 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 mu M Al and an organic layer leachate. Dose-response curves were generated for root and shoot morphologic properties to determine effective concentrations (EC). Shoot biomass and healthy leaf area decreased by 44 % to 83 % at 2400 mu M Al, root biomass did not respond (C. odorata), declined by 51 % (H. americanus), or was stimulated at low Al concentrations of 300 mu M (T. chrysantha). EC10 (i.e. reduction by 10 %) values of Al for total biomass were 315 mu M (C. odorata), 219 mu M (H. americanus), and 368 mu 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 toxicity. Al toxicity occurred at Al concentrations far above those in native organic layer leachate.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Institute of Geography > Physical Geography > Unit Soil Science
08 Faculty of Science > Institute of Geography

UniBE Contributor:

Rehmus, Agnes; Bigalke, Moritz and Wilcke, Wolfgang

Subjects:

900 History > 910 Geography & travel

ISSN:

0032-079X

Publisher:

Springer

Language:

English

Submitter:

Monika Wälti-Stampfli

Date Deposited:

08 Oct 2014 16:18

Last Modified:

19 Oct 2015 09:53

Publisher DOI:

10.1007/s11104-014-2110-0

BORIS DOI:

10.7892/boris.59101

URI:

https://boris.unibe.ch/id/eprint/59101

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