Fritioff A, Kautsky L, Greger M
Department of Botany, Stockholm University, S-106 91 Stockholm, Sweden.
Environ Pollut. 2005 Jan;133(2):265-74. doi: 10.1016/j.envpol.2004.05.036.
Submersed plants can be useful in reducing heavy metal concentrations in stormwater, since they can accumulate large amounts of heavy metals in their shoots. To investigate the effects of water temperature and salinity on the metal uptake of two submersed plant species, Elodea canadensis (Michx.) and Potamogeton natans (L.), these plants were grown in the presence of Cu, Zn, Cd, and Pb at 5, 11, and 20 degrees C in combination with salinities of 0, 0.5, and 5 per thousand. The metal concentrations in the plant tissue increased with increasing temperature in both species; the exception was the concentration of Pb in Elodea, which increased with decreasing salinity. Metal concentrations at high temperature or low salinity were up to twice those found at low temperature or high salinity. Plant biomass affected the metal uptake, with low biomass plants having higher metal concentrations than did high biomass plants.
沉水植物有助于降低雨水里的重金属浓度，因为它们能够在茎中积累大量重金属。为了研究水温与盐度对两种沉水植物——加拿大伊乐藻（密克）和浮叶眼子菜（林奈）——吸收金属的影响，这些植物在含有铜、锌、镉和铅的环境中生长，温度分别为5℃、11℃和20℃，盐度分别为0‰、0.5‰和5‰。两种植物组织中的金属浓度均随温度升高而增加；例外的是伊乐藻中铅的浓度，它随盐度降低而增加。高温或低盐度下的金属浓度高达低温或高盐度下的两倍。植物生物量影响金属吸收，生物量低的植物比生物量高的植物具有更高的金属浓度。
