超富集植物对茶树体内及根围土壤镉迁移的影响  

Effects of Hyperaccumulators on Cadmium Migration in Tea Plant and Rhizosphere Soil

作　　者：陈瑞燕 潘月燕 王国夫 CHEN Ruiyan;PAN Yueyan;WANG Guofu(ZheJiang ShaoXing Ecological Environment Monitoring Center,Shaoxing 312000,China;Zhejiang Guozheng Security Technology Co.,Ltd.,Shaoxing 312000,China;School of Architectural Engineering,Shaoxing University Yuanpei College,Shaoxing 312000,China)

机构地区：[1]浙江省绍兴生态环境监测中心,浙江绍兴312000 [2]浙江国正安全技术有限公司,浙江绍兴312000 [3]绍兴文理学院元培学院建筑工程分院,浙江绍兴312000

出　　处：《三峡生态环境监测》2024年第4期59-67,共9页Ecology and Environmental Monitoring of Three Gorges

摘　　要：为探究相同生态位下茶树和超富集植物间作中重金属镉(Cd)的富集特征及根系互作对茶树生长、Cd竞争吸收的影响,采用人工模拟茶园Cd污染环境,选用2种茶树(龙井43、铁观音)分别与4种超富集植物(龙葵、鬼针草、小蓬草、一年蓬)间作,结果表明:(1)与单作相比,不同间作模式下龙井43茶树和铁观音茶树叶片叶绿素a、b含量存在显著差异,其中以小蓬草间作效果最好,龙井43茶树与小蓬草间作后其叶绿素a、b含量分别增加66.7%和42.1%,铁观音茶树与小蓬草间作后其叶绿素a、b含量分别增加66.2%和40.2%。(2)龙井43茶树和铁观音茶树分别与4种超富集植物间作后茶树叶部Cd含量较单作均显著降低,降幅从高到低依次为鬼针草、一年蓬、小蓬草、龙葵,其中与鬼针草、一年蓬间作后叶片镉含量降低70%以上;龙井43茶树和铁观音茶树分别与4种超富集植物间作后茶树根部Cd含量存在显著差异,其中与鬼针草间作后根部镉含量降低60%以上。(3)与2种茶树间作的4种超富集植物地上部富集系数存在显著差异,与龙井43茶树间作的植物根部富集系数差异不显著,而与铁观音茶树间作的植物根部富集系数具有显著差异,4种超富集植物的转运系数差异不显著。(4)与龙井43、铁观音茶树单作相比,4种间作植物根际土壤弱酸提取态Cd所占比例均提高,可氧化态Cd所占比例均下降;间作模式均显著降低了茶树根际土壤Cd迁移性和可利用性。综合分析,鬼针草与2种茶树间作能更好地促进茶树的生长,减少茶树叶部和根部的镉含量,富集系数也高于一年蓬、小蓬草、龙葵。因此,鬼针草可作为Cd污染茶园土壤修复植物之一,适合在茶园土壤Cd污染治理中应用。In order to explore the enrichment characteristics of heavy metal cadmium(Cd) in intercropping between tea trees and ultra-rich plants under the same ecological position and the influence of root interaction on tea tree'growth and Cd competition absorption,artificial simulation of Cd-polluted tea garden enviriment was adopted,and two kinds of tea trees(Longjing 43 and Tieguanyin) were selected for intecropping with four kinds of hyperaccumulator plants [Solanum nigrum L.,Bidens pilosa L.,Erigeron canadensis L.,and Erigeron annuus(L.) Pers.] respectively.The results show that:(1)Compared with single cropping,there were significant differences in chlorophyll a and b contents in leaves of Longjing 43 tea tree and Tieguanyin tea tree under different intercropping modes.Among them,the intercropping effect of Erigeron canadensis L.was the best,and the content of chlorophyll a and b in Longjing 43 tea tree increased by 66.7% and 42.1% respectively after intercropping with Erigeron canadensis L.,while the content of chlorophyll a and b in Tieguanyin tea trees increased by 66.2% and 40.2%,respectively.(2) The Cd content in leaves of Longjing 43 tea tree and Tieguanyin tea tree interplanted with four hyperenriched plants was significantly decreased compared with that of single cropping,and the decrease order from high to low was Bidens pilosa(L.) Pers.Erigeron annuus(L.) Pers.Conyza canadensis L.and Solanum nigrum L.Among them,after intercropping with Bidens Pilosa L.and Erigeron annuus(L.),the Cd content in the leaves decreased by more than 70%.The Cd content of Longjing 43 tea tree and Tieguanyin tea tree was significantly different from that of 4 hyperenriched plants,and the Cd content of Longjing 43 tea tree and Tieguanyin tea tree was reduced by more than 60% after interplanting with Bidens pilosa L.(3) There were significant differences in the aboveground accumulation coefficients of the four hyperaccumulators when intercropped with 2 tea trees,but no significant differences in the root accumulation coefficients when

关 键 词：茶树 超富集植物 间作 CD 迁移性 

分 类 号：N945.11[自然科学总论—系统科学]