金属矿区芒草种群对重金属的积累及其与土壤特性的关系

生态学杂志

金属矿区芒草种群对重金属的积累及其与土壤特性的关系

李勤奋^1;杜卫兵³;李志安³;王峥峰³;彭少麟^2,3

¹中国热带农业科学院环境与植物保护研究所，儋州 571735；²中山大学有害生物控制与资源利用国家重点实验室，广州 510275；³中国科学院华南植物园，广州 510650

收稿日期:2004-12-31 修回日期:2005-11-02 出版日期:2006-03-08 发布日期:2006-03-08

eavy metals accumulation in mining area’s Miscanthus sinensis populations and its relationship with soil characters

LI Qinfen¹;DU Weibing³;LI Zhi’an³;WANG Zhengfeng³;PENG Shaolin^2,3

¹Environment and Plant Protection Institute,Chinese Academy of TropicalAgricultural Sciences,Danzhou 571737, China; ²Zhongshan University,Guangzhou 510275, China; ³South China Botany Garden,Chinese Academy of Sciences,Guangzhou 510650,
China

Received:2004-12-31 Revised:2005-11-02 Online:2006-03-08 Published:2006-03-08

摘要/Abstract

摘要： 通过分析大型综合金属矿区中经历不同污染强度与污染时间胁迫的芒草（Miscanthus sinensis）种群对4种主要重金属的积累状况，初步揭示芒草对这些重金属的积累特性与土壤重金属含量的关系。结果表明，1 芒草根茎叶对4种重金属的的积累顺序为：根＞叶＞茎；2芒草对Cd、Pb的积累量与土壤中这两种重金属含量之间存在显著（P<0.05）正相关关系；对Cu、Zn的积累量与土壤含量之间无显著相关，主要是因为土壤最高Cu与Zn含量已超过芒草对这两种元素积累所需的最大量，成为对芒草构成胁迫的主要因子。在该矿区的酸性条件下，芒草对Pb、Zn、Cu 3种重金属的吸收率随pH值升高而升高，pH接近的样地，芒草的吸收率主要受土壤重金属含量的影响。结合各种群对四种重金属的积累状况判断，强度胁迫下的种群可能已发生耐性分化，从而产生较其它种群更强的耐重金属特性。总体上芒草是一种多重金属耐性植物，对这四种重金属的耐性顺序是：Cd

Abstract: This paper studied the heavy metals accumulation in Miscanthus sinensis populations which experienced different intensity and duration of pollution in a multiple heavy metal mining area.The results showed that the accumulation of Pb,Cd,Cu and Zn in M.sinensis was in the order of root > leaf > stalk.The average accumulation of Pb and Cd in M.sinensis was significantly correlated with the contents of the two metals in soil (P<0.05),but that of Cu and Zn did not show such a trend because the contents of the two metals in soil were higher than their maximum accumulation in M.sinensis,indicating that the contents of soil Cu and Zn were the main stress factor to M.sinensis.The absorptivity of Pb,Zn and Cu by M.sinensis increased with soil pH,but in the soils with same pH,the absorptivity was affected by the contents of these three metals in soil.As a whole,M.sinensis was a multiple heavy metals-tolerant species,and its tolerance to the four metals was in the order of Cd < Cu < Pb-Zn.

Key words: Vegetable greenhouse, Upland vegetable field, Soil chemical property, Nitrate enrichment

李勤奋^1;杜卫兵;李志安;王峥峰;彭少麟^2,3 . 金属矿区芒草种群对重金属的积累及其与土壤特性的关系[J]. 生态学杂志.

LI Qinfen¹;DU Weibing³;LI Zhi’an³;WANG Zhengfeng³;PENG Shaolin^2,3. eavy metals accumulation in mining area’s Miscanthus sinensis populations and its relationship with soil characters[J]. cje.