污泥改良锰矿尾渣对4种花卉植物生长及其富集重金属的影响

采用盆栽试验方法，研究了污泥改良锰矿尾渣对紫茉莉（Mirabills jdapa）、青葙（Celosia argentea）、一串红（Salviasplendens）和鸡冠花（Celosia cristata）4种花卉植物生长及其富集铅、镉、锌和锰的影响。结果表明，添加污泥增加基质的EC值、总氮、总磷、总钾和有机质含量，而降低铅、镉、锌和锰含量。紫茉莉与青葙生物量、株高和根长大于一串红和鸡冠花。紫茉莉根部铅、镉和锰含量分别为3110．93～4189．16、300．28～399．16和31100．93～36809．77mg·kg-1，都远高于其地上部分含量。青葙根部铅含量超过1000mg·kg-1，而其地上部分含量少；其地上部分镉和锰含量分别为322．13～441．88和21888．54～26511．31mg·kg-1，都大于其根部含量，青葙具有镉和锰超富集植物的特性。污泥改良锰矿尾渣促进这4种花卉植物生物量、株高和根长增加。除紫茉莉锌含量外，添加污泥改良锰矿尾渣增加这4种花卉植物的铅、镉、锌和锰含量。在锰矿尾渣污染区进行植物修复时，采用紫茉莉、青葙和添加污泥强化植物修复效率可行。

Influence of Mn Mine Tailings Amended with Sewage Sludge on Plant Growth of Four Ornamental Species and Accumulation of Heavy Metals

Phytoremediation can phytostabilize or phytoextraet heavy metal contaminants in mine tailings through revegetation by using ap- propriate plant species. In this study, four ornamental plants：Mirabilis jalapa, Celosia argentea, Salvia splendens and Celosia cristata, were used to evaluate effects of sewage sludge amendment on phytoremediation of Mn mine railings in pot experiments in terms of plant biomass, seedling height, root length, Pb, Cd, Zn, and Mn accumulation in plan tissues. Addition of 5%-20% sewage sludge （dry weight）in Mn mine tailings increased the EC values, the contents of total N, P, K, and organic matter, and decreased the concentrations of Pb, Cd, Zn and Mn in medium. Application of sewage sludge not only increased plant biomass, seedling height and root length, but also increased Pb, Cd, Zn and Mn concentrations in both roots and aboveground tissues of plants, except for Zn content for M. jalapa. Plant growth and heavy metal accumu- lation differed significantly among the tested species. Plant biomass, seedling height and root length of M. jalapa and C. argentea were greater than those of S. splendens and C. cristata. The concentrations of Pb, Cd and Mn in roots of M. jalapa ranged from 3 110.93 to 4 189.16 mg· kg-1, 300.28 to 399.16 mg·kg-1, and 31 100.93 to 36 809.77 mg·kg-1, respectively. The Pb content was larger than 1 000 mg·kg-1 in roots but very low in aboveground tissues of G. argentea. The concentrations of Cd and Mn in aboveground tissues of C. argentea ranged from 322.13 to 441.88 mg·kg-1 and 21 888.544 to 26 511.31 mg· kg-1, respectively, which were much higher than those in roots. C. argentea showed a hyper- accumulation capacity to Cd and Mn. Application of sewage sludge could be a practical option to improve phytoremediation of Mn mine tailings contaminated soils by planting M.jalapa and C. argentea.