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Annals of Botany 82: 83-87, 1998
© 1998 Annals of Botany Company

Comparison of Biomass and Metal Uptake between Two Populations ofPhragmites australisGrown in Flooded and Dry Conditions

Z. H. YE, M. H. WONG, A. J. M. BAKER+, and A. J. WILLIS

Institute for Natural Resources and Waste Management, and Department of Biology, Hong Kong Baptist University, Kowloon Tong, Hong Kong SAR, PR China Department of Animal and Plant Sciences, University of Sheffield, S. Yorks, S10 2TN, UK

January 7, 1998 ; February 6, 1998 . March 30, 1998 .

The biomass and metal concentrations of two populations ofPhragmites australiswere studied by growth in a glasshouse in three ameliorated substrata [Mai Po (MP) sediment, fly ash (FA) and lead/zinc mine tailings (TL)] under flooded and dry conditions for 90 d. Plants were raised from seeds from ‘clean’ (Mai Po, Hong Kong) and metal-contaminated (Plombières, Belgium) sites. Seedling growth was best in fly ash, root dry weights being higher in flooded than dry conditions, and growth poorest in tailings, in which shoot and root dry weights were higher under dry conditions for both populations. However, in the MP substratum conditions did not significantly affect shoot and root dry weights of either population. In the fly ash and tailings, more metals were generally taken up in both roots and shoots in flooded than dry conditions, but there was little difference in the MP substratum. Metal uptake was mostly similar in both populations in seedlings grown in the same substratum, there being no clear evidence of ecotypic differentiation.Copyright 1998 Annals of Botany Company

Biomass, flooded and dry conditions, metal uptake,Phragmites australis.


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