摘要
伴矿景天(Sedumplumbizincicola)是一种Cd和Zn的超积累植物,常用于Cd污染土壤的植物修复。有机酸能够提高土壤重金属的有效性,促进植物对重金属的积累,对重金属污染土壤的植物修复效率具有强化作用,并对土壤微生物数量有重要影响。以河潮土和红黄泥为供试土壤,探讨了乙二胺四乙酸(EDTA)、柠檬酸、草酸对伴矿景天修复效率和土壤微生物数量的影响。结果表明,有机酸能显著提高土壤有效态Cd含量,柠檬酸处理的效果最好,河潮土和红黄泥中有效态Cd含量较单种伴矿景天分别增加72.73%,12.99%(P<0.05);伴矿景天地上部Cd含量在河潮土和红黄泥中以EDTA处理最高,在河潮土和红黄泥中分别比单种伴矿景天增加99.24%和33.32%;与单种伴矿景天相比,添加有机酸处理河潮土和红黄泥中伴矿景天修复效率显著提高。添加有机酸比单种伴矿景天显著增加土壤中微生物数量,其中柠檬酸处理河潮土中细菌和真菌数量分别增加34.38%和68.42%(P<0.05),草酸处理红黄泥中放线菌数量增加150.00%。研究结果可为重金属污染土壤的植物强化修复提供理论支撑。
Sedum plumbizincicola is a hyperaccumulator of Cd and Zn,and commonly used for the remediation of Cd-contaminated soil.Organic acids can increase the availability of heavy metals in soil,and enhance the accumulation of heavy metals in plants,and thus increase the plant remediation efficiency of heavy metal-contaminated and influence microbial quantity in soil.In this study,alluvial soil and reddish clay soil were used as test soils,and the effects of EDTA,citric acid,oxalic acid on remediation efficiency of Sedum plumbizincicola and soil microbial quantity were discussed.The results showed that organic acid could significantly increase the soil available Cd content,with the best effect given by citric acid.The available Cd contents in alluvial soil and reddish clay soil increased by 72.73%and 12.99%respectively compared to SCK(P<0.05).Sedum plumbizincicola in planted in two soils treated with EDTA had the highest shoot Cd content,which increased by 99.24%and 33.32%in the alluvial soil and reddish clay soil,respectively.The remediation efficiency of Sedum plumbizincicola cultivated in two soils treated with organic acid increased significantly compared with SCK.The application of organic acids increased significantly the quantity of microorganisms in soil compared with SCK,in which citric acid increased the quantity of bacteria and fungi in alluvial soil by 34.38%and 68.42%(P<0.05)respectively,and oxalic acid treatment increased the quantity of actinomycetes in reddish clay soil by 150.00%.This study could provide theoretical support for plant enhancement remediation technology used in heavy metal contaminated soils.
作者
柏佳
谭长银
曹雪莹
周青
黄硕霈
彭曦
邓月强
孙丽娟
BAI Jia;TAN Changyin;CAO Xueying;ZHOU Qing;HUANG Shuopei;PENG Xi;DENG Yueqiang;SUN Lijun(College of Resources and Environmental Science,Hunan Normal University,Changsha410081;Key Laboratory of Environmental Heavy Metal Pollution Mechanism and Ecology Remediation,Hunan Normal University,Changsha 410081)
出处
《水土保持学报》
CSCD
北大核心
2020年第2期318-324,共7页
Journal of Soil and Water Conservation
基金
湖南省科技计划重点项目(2017NK2141)
湖南省国内一流培育学科建设项目(湘政发[2017]3号)。
关键词
有机酸
伴矿景天
植物修复
微生物数量
重金属有效性
水稻土
organic acids
Sedum plumbizincicola
phytoremediation
microbial quantity
availability of heavy metal
paddy soil
