TITLE Effects of natural leachates of Acacia dealbata Link in Galicia (NW Spain)
AUTHOR Alejo Carballeira
Ecologia, Departamento de Biologia Fundamental, Facultad de Biologia, Universidade de Santiago de Compostela, Spain
Manuel J. Reigosa
Fisioloxia Vexetal, Dep. Bioloxia Vexetal e Ciencia do Solo, Facultade de Ciencias de Vigo, Universidade de Vigo, Apt 874, 36200 Vigo, Spain
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ABSTRACT A systematic collection of throughfall (rain passing through the canopies), stemflow (rain flowing over the stems), and soil percolates was carried out in a Acacia dealbata plantation during one year, and its allelopathic capacity was biotested using Lactuca sativa L. var. Great Lakes. The results showed an allelopathic effect related to flowers: Germination of L. sativa was inhibited 30% by throughfall, 60% by stemflow, and 75% by soil percolates during the blossoming of A. dealbata, while radicle growth of L. sativa was inhibited 23%, 33%, and 48% by the same solutions. Climatic factors, particularly rainfall some days before, were also important. The three types of samples showed significant toxicities during some periods of the year, particularly percolates, which retained toxicity for a longer time, due perhaps to the decomposition of flowers fallen on the ground.
KEYWORD Acacia dealbata; Allelopathy; Percolate; Stemflow; Throughfall;
ARTICLE INFO Botanical Bulletin of Academia Sinica, Volume 40 Number 1 January 1999, page 87-92, 6 pages
PUBLISHER Institute of Plant and Microbial Biology, Academia Sinica, Taipei, Taiwan, Republic of China