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   作者單位： 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： 自然科學(xué)進(jìn)展(英文版)  SCI 英文刊名： PROGRESS IN NATURAL SCIENCE  年，卷(期)： 2004 14(6)  分類(lèi)號(hào)： Q94  關(guān)鍵詞： contaminated soil   phytoremediation   hyperaccumulative characteristic   weed   heavy metal   cadmium  

【Identification of weed species with 】相關(guān)文章：

Aquatic beetle species and their distributions in Xinjiang, China04-26

A stochastic method for convective storm identification,tracking and nowcasting04-26

大學(xué)英語(yǔ)作文：How to Protect The Endangered Species in The World08-09

Effects of Ca on the distribution,structure and morphology of aluminum species in polyaluminum chloride04-27

Three newly recorded species of the genus Diphascon (Tardigrada; Hypsibiidae) from China04-26

Development of SSR markers from ESTs of gramineous species and their chromosome location on wheat04-26

Natural regeneration dynamics of three dry deciduous forest species in Chacocente Wildlife Reserve, Nicaragua04-26

Identification of 3.5 Ga detrital zircons from Yangtze craton in south China and the implication for Archean crust evolu04-26

Changes in plant biomass and species composition of alpine Kobresia meadows along altitudinal gradient on the Qinghai-Ti04-27

Species diversity and regeneration of old-growth seasonally dry Shorea robusta forests following gap formation04-26