喀斯特山地煤矿废弃地几种优势植物的重金属耐性特征  

Heavy metal tolerance characteristics of several dominant species in coal mine wasteland of Karst mountain

作　　者：龙健[1] 冉海燕 LONG Jian;RAN Haiyan(Buckwheat Industrial Technology Research Center,Guizhou Normal University,Guiyang 550001,China;Plant Protection Institute,Guizhou Academy of Agricultural Sciences,Guiyang 550006,China)

机构地区：[1]贵州师范大学荞麦产业技术研究中心,贵阳550001 [2]贵州省农业科学院植物保护研究所,贵阳550006

出　　处：《生态科学》2019年第2期212-218,共7页Ecological Science

基　　金：重金属污染土壤的修复技术研究(黔教科2011028号)

摘　　要：对贵阳花溪区麦坪乡煤矿废弃地进行了野外调查,对该地优势植物和土壤进行了采样,测定样品As、Cd、Cu、Hg、Pb和Zn的含量,发现当地优势植物雀稗(Paspalum thunbergii Kunth ex Steud.)地上部分Cu含量达到1058.12mg·kg^(-1),转移系数2.89,富集系数16.07。研究了雀稗在铜离子胁迫实验中的根系活力变化和叶绿素浓度变化,雀稗根系活力随实验进行而逐渐降低,铜离子浓度为500μg·mL^(-1)的实验进行到第四周时TTC还原量达到最低值;叶绿素浓度随着铜离子浓度的增加而缓慢降低,进一步确认当地土著植物雀稗对铜离子有一定的耐受性。A field survey was carried out on the abandoned land of Maiping coal mine wasteland in Huaxi district,Guiyang city,by sampling the dominant species and soil and determining the content of As,Cd,Cu,Hg,Pb and Zn.It was found that the content of Cu in the dominant species Paspalum thunbergii Kunth ex Steud.reached to 1058.12 mg·kg-1.The transfer coefficient was 2.89 and enrichment coefficient was 16.07.Effects of copper ion stress on chlorophyll and root activity in Paspalum thunbergii Kunth ex Steud.were studied.Root activity decreased gradually with the experiment.The reduction amount of TTC reached the lowest value at the fourth week after the experiment with copper ion concentration of 500 g·mL-1 was carried out.The chlorophyll concentration decreased slowly with the increase of copper ion concentration.It was further confirmed that Paspalum thunbergii Kunth ex Steud.was tolerant to copper ion as a native species.

关 键 词：煤矿废弃地 优势植物 重金属耐性 

分 类 号：X53[环境科学与工程—环境工程]