Study on Accumulation of Ni in Seedlings and Growth rate of Salix reichardtii by Hydroponic Culture in Ni Solution

摘要

This study was carried out to provide preliminary data to purify contaminated sites by nickel (Ni). After rooted cuttings of Salix reichardtii had been grown in Ni solution (hydroponic culture), pH changes in the solution and the accumulated Ni amountin plant parts were measured and analyzed. When the Ni concentration was low enough for S. reichardtii cuttings to grow well, the pH value of the solution decreased considerably. As the Ni concentration got higher, the plant growth got poorer and the pHvalue decreased slowly. Roots accumulated the highest Ni amount. Leaves and stems followed after. When stems were older, the accumulated Ni amount was lower, more Ni was accumulated in the plant parts which had more flexible tissue and live cells. As the Ni concentration in solution got higher up to 50.0 mu mol/L, so did the Ni accumulation in the plant parts. However, the plant individuals nearly died and the Ni accumulation tended to drop when the Ni concentration in solution was 100.0 mu mol/L. Therooted cuttings of S. reichardtii grew poorer as the Ni concentration in solution got higher. The plants in solution with 100.0 mu mol/L of Ni were practically dead in four weeks.