Journal of Food, Agriculture and Environment

Influence of allelopathic strategy on the recruitment and composition of communities invaded by Solidago canadensis

Author(s):

Yuzhe Li ^{1, 2}, Jiangwen Fan ¹*, Xin Yin ^{2, 3}, Wei Wei ^{2, 3}

Recieved Date: 2014-01-10, Accepted Date: 2014-03-28

Abstract:

Solidago canadensis is a widespread invasive species considered to have allelopathic effects on associated species. We consider if an autotoxic effect exists when the concentration of allelopathic compounds accumulated and how this might influence the composition of communities it invades. Higher concentrations (50, 100 and 200 mg/mL) of S. canadensis extract significantly decreased the germination rate of S. canadensis by more than 10% (P<0.05), and also decreased sprout length. In comparison, Phragmites australis was insensitive to extracts from both itself and S. canadensis. Growing in mixture with P. australis, the seed weight, individual stem biomass, stem height and Specific Leaf Weight (SLW) of S. canadensis decreased significantly (P<0.05), whereas the influence on P. australis was much smaller. Grown in mixture the Importance Value (IV) of S. canadensis calculated from height, cover and stem density decreased from 0.5 to 0.2, while the importance of P. australis increased gradually from 0.4 to 0.7. We suggest that auto-allelopathic effects can restrain the invasiveness of exotic allelopathic plants. Invasion may result in the formation of communities that consist of more species insensitive to allelopathic effects.

Keywords:

Allelopathy, autotoxicity, plant invasion, novel weapons hypothesis, Solidago canadensis

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Journal: Journal of Food, Agriculture and Environment
Year: 2014
Volume: 12
Issue: 2
Category: Environment
Pages: 1248-1254

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