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环境化学  2015 

南京近郊主要森林类型对土壤重金属的吸收与累积规律

Keywords: 森林植物,重金属元素,累积,吸收,南京

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Abstract:

研究了南京近郊针、阔叶树种杉木(Cunninghamialanceolata)、麻栎(Quercusacutissima)对重金属元素铬、铜、镍、铅、锌的吸收和累积规律.研究结果表明,5种重金属元素在2种林分的枯落物层含量均高于灌草层和乔木层各部位,但由于乔木层生物量较大,重金属元素在2种森林生态系统中主要储存在乔木层,其总储量大小顺序为麻栎>杉木.2种林分乔木层对5种重金属元素的总富集系数杉木大于麻栎,表明杉木对土壤重金属的吸收能力大于麻栎,但根据吸收系数、归还系数及周转期3个指标可知,麻栎对土壤重金属的净化效果要优于杉木.因此,在评价植物对土壤重金属元素的净化效果时,不能仅凭富集系数定优劣,要综合考察影响其净化效果的其它因素.

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