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对大宝山矿区周边酸性多金属污染农田土壤进行了5年的红麻原位种植试验,研究不同改良剂对土壤改良的持效性及其对红麻生长的影响,以探索具重金属耐性的经济作物红麻用于重金属污染土壤大田复垦的可行性和有效性.结果表明:施加改良剂后,红麻能在重金属Pb、Zn、Cu、Cd和As含量分别为1600、440、640、7.6和850mg·kg-1的土壤上定植.其中,白云石和粉煤灰的改良效果优于石灰石和有机肥.施加白云石或粉煤灰后,红麻地上部产量(干质量)为14～15t·hm-2,达到一般农田产量水平,且红麻杆和红麻皮中重金属含量显著降低.红麻韧皮纤维(麻皮)含量达到32%～38%,韧皮纤维中可萃取重金属含量低于《生态纺织品技术要求》的标准,具有潜在的经济效益.白云石/粉煤灰改良红麻复垦的化学-植物联合修复模式是复垦酸性多金属污染农田土壤的有效措施.
Five years of in situ plantation of kenaf in acidic poly-polluted farmland around Dabashan mining area was carried out to study the effect of different modifiers on soil improvement and its impact on the growth of kenaf to explore the economic crops with heavy metal tolerance The results showed that the kenaf could be used in the reclamation of heavy metal contaminated soils in the fields of heavy metal contaminated soil with the contents of Pb, Zn, Cu, Cd and As of 1600, 440, 640, 850mg · kg-1 soil, among which, the improvement effect of dolomite and fly ash was better than that of limestone and organic fertilizer.The yield (dry weight) of aboveground part of kenaf after applying dolomite or fly ash was 14 ~ 15t · hm -2, reached the level of general farmland output, and the contents of heavy metals in kenaf bar and kenaf decreased significantly.The content of kenaf bast fiber reached 32% -38%, the content of extractable heavy metals in bast fiber was lower than Potential economic benefits of the standard “technical requirements for eco-textiles” The combined chemical-plant restoration model for dolomite / fly ash improvement kenaf reclamation is an effective measure to reclaim acid soil contaminated by polymetallics.