To investigate the efficiency of Sedum alfredii in extracting heavy metals from farmland under intercropping systems,this study employed the technique of intercropping the Cd-hyperaccumulator Sedum alfredii with sweet corn to conduct experiments in moderately cadmium-contaminated farmland in South China.The results indicated that under the intercropping system,the yield of sweet corn increased,and the Cd content in the kernels significantly decreased by 8.3％compared to monoculture.Additionally,under the intercropping system,the biomass of Sedum alfredii increased by 16.5％,with Cd accumulation in the roots and shoots increasing by 8.8％and 3.6％,respectively.The enrichment coefficients improved by 15.7 and 6.6 units,respectively.After intercropping sweet corn with Sedum alfredii,the Cd content in the top soil significantly decreased.The experiment demonstrated that the phytoremediation model of intercropping Sedum alfredii with sweet corn not only allowed for the simultaneous remediation and production of polluted farmland but also enhanced the extraction efficiency of the hyperaccumulator plant.This approach presented a practical and green remediation technology for moderately heavy metal-contaminated farmland.
关键词
重金属污染/东南景天/甜玉米/套种/超富集植物/植物提取
Key words
heavy metal pollution/Sedum alfredii/sweet corn/interplanting/hyperaccumulator/phytoextraction
维普
万方数据