土壤理化性质与海州香薷(Elsholtzia splendens Nakai)铜锌积累的关系

The correlation of soil physiochemical properties and copper-zinc accumulation of Elsholtzia splendens

土壤理化性质是决定重金属矿山废弃地植被恢复效率和成败的重要因素之一。选取芜湖市南陵县境内大工山-凤凰山古铜矿区的3处弃土场和两处对照点,调查了其植被覆盖度、物种组成,并分析了土壤性质与海州香薷铜、锌积累的相关性。结果显示,矿区土壤污染程度随废弃时间的增加和植物多样性的提高而降低,但仍未达到安全水平。海州香薷对铜、锌的积累主要发生在地下部分,地上部分的最高铜浓度为179.83mg/kg,远未达到铜超积累植物的标准,只是一种规避植物。海州香薷的铜、锌积累量主要取决于土壤铜、锌浓度水平,同时与土壤全磷、有效磷和pH值等因素显著相关,而与土壤有机质无相关性;并且海州香薷对铜、锌两种主要污染元素的积累可能存在某种协同作用。

Soil physiochemical properties are important factors that determine the efficiency and success of vegetation restoration of heavy metal contaminated lands.Three mine spoils and two reference sites were selected from Dagongshan-Fenghuangshan ancient copper mine situated in Nanling County,Wuhu city of Anhui province.The vegetation coverage,species composition,and correlation of soil properties and copper-zinc accumulation of Elsholtzia splendensand were investigated.The results showed that soil contamination level decreased with abandon duration and increasing plant diversity,however,still exceeded the safety level.The copper-zinc accumulation of E.splendens mainly occurred in underground.The copper-zinc accumulation of E.splendens was mainly determined by soil copper-zinc concentrations,and was highly related to total phosphorus,available phosphorus concentrations and pH,but not to soil organic matters.Furthermore,the copper and zinc accumulation of E.splendens showed a certain synergistic effect.