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Growth of a nonindigenous shrub, Amur honeysuckle (Lonicera Maackii), under varying light, water and soil conditions. (Floristics and Invasive Species 02:00 PM, Saturday, April 5, 2003 Brewer/Frost Science 109 Dr. Brian C. McCarthy-Presiding).

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Amur honeysuckle (Lonicera maackii) is an exotic invasive shrub that has become problematic throughout many regions of the eastern U.S. This shrub is able to invade a habitat by suppressing recruitment of native species, yet L. maackii does not equally invade all habitat types. The goal of this experiment was to evaluate its performance under a number of conditions to better understand its potential growth. We used a fully-crossed factorial design with light (10%, 50%, 100% full light), water availability (soil brought to 50% and 100% full water capacity biweekly), and soil type (from glaciated and unglaciated Ohio) as main effects, MANOVA results found soil type to be nonsignificant in predicting growth responses, which indicates equal invasive ability in both glaciated and unglaciated soils. Light, water, and light water treatments were significant (P < 0.05). ANOVAs indicated that seedling growth parameters were greatest for all measured variables (except root-shoot ratio and leaf dry matter content) in the high light treatments (either 50 or 100% full light) combined with the 100% water capacity soil treatment. A negative correlation was found between overall growth and root-shoot ratio suggesting that allocation to aboveground biomass, rather than below, occurs when growth conditions are favorable. The least amount of growth occurred in low light-low water conditions; however, no seedling mortality occurred allowing es[]L. maackii to persist until conditions improve. Because L. maackii had the best seedling performance in bright, moist conditions, habitat types with these characteristics should be monitored most closely for future invasion.

KURT M. HARTMAN KH349592@OHIO.EDU AND BRIAN C. MCCARTHY MCCARTHY@OHIO.EDU, DEFT OF ENVIRONMENTAL AND PLANT BIOLOGY, OHIO UNIVERSITY, ATHENS OH 45701
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Author:Hartman, Kurt M.; McCarthy, Brian C.
Publication:The Ohio Journal of Science
Geographic Code:1U3OH
Date:Mar 1, 2003
Words:277
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