陡坡无土排岩场植被生态修复技术

Phytoremediation of soilless steep slope in mining junkyard

针对无土陡坡排岩场特殊的立地条件,以城市污泥、粉煤灰等固体废弃物配制的人工土壤进行基质改良的基础上,以坑植式种植刺槐(Robina pseudoacacia)及棉槐(Amor-pha fruticosa),同时在种植坑中撒播牧草以培肥土壤,促进乔木生长固坡。结果表明,在人工土壤Ⅱ(粉煤灰∶城市污泥=1∶1)上种植的刺槐有较好的成活率(70%)和生长势,说明该修复技术在实现以废治废,变废为宝的同时,既解决了矿山废弃地修复中珍贵的土源问题,又改善了矿区生态环境。

Aiming at the special conditions of soilless steep slope in mining junkyard, the artificial soils composed of sewage sludge and fly ash were used as the medium, and Robina pseudoacacia and Amorpha fruticosa were planted in pits. At the same time, grasses were grown in the pits to fertilize the artificial soils. It was found that the R. pseudoacacia planted on artificial soil II （ fly ash： sewage sludge = 1 ： 1 ） had a high survival rate （ 70% ） and a higher growth potential, suggesting that this remediation technology offered a potential of industrial by-product utilization, and solved the shortage of soil resources in mining area.