Identification of weed species with hyperaccumulative characteristics of heavy metals
In order to promote the effective and economic remediation of soils contaminated with single Cd and Cd combined with Ph, Cu and Zn, a field-screening study on weed hyperaccumulators was carried out on the basis of field pot-culture experiments used to determine characteristics of weed plants enduring and accumulating heavy metals. In this study, 54 weed species belonging to 20 families from agricultural fields of the Shengyang suburbs were tested. The results showed that Taraxracum mongolicum, Solanum nigrum and Conyza canadensis could strongly tolerate single Cd and Cd-Pb-Cu-Zn combined pollution, had high Cd-accumulative ability, and generally possessed basic characteristics of hyperaccumulators. Because there are synergic and antagonistic effects among Cd, Pb, Cu and Zn, singlefactor pollution tests should be done as well as combined pollution tests during the identification of hyperaccumulators to ensure the efficiency of phytoremediation and the practical significance of hyperaccumulators identified. The field pot-culture experiment should be a new tentative method to screen out accumulative and tolerant species in view of its obvious advantages such as simple operation, low cost, and easy identification of investigated plants.
作 者： WEI Shuhe ZHOU Qixing 作者单位： Key Laboratory of Terrestrial Ecological Process, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016,China;Graduate School of the Chinese Academy of Sciences, Beijing 100039, China 刊 名： 自然科学进展(英文版) SCI 英文刊名： PROGRESS IN NATURAL SCIENCE 年，卷(期)： 2004 14(6) 分类号： Q94 关键词： contaminated soil phytoremediation hyperaccumulative characteristic weed heavy metal cadmium