不同种植年限香根草对煤矸石山基质中重金属分布的影响
Effect of different planting years of Vetiveria zizanioides L. on the distribution of heavy metals in coal spoil-heap soil
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摘要: 为研究不同种植年限香根草对煤矸石山基质中重金属分布的影响,以贵州省六盘水大河煤矿为例,对2013年、2009年、2007年、2005年和2002年种植香根草的煤矸石山基质中的Cu,Zn,Cd,Pb,As共5种重金属含量进行测定。结果表明:随着香根草种植年限的增加,煤矸石基质中Cu,Zn,Cd,Pb,As五种重金属含量减小的趋势各不相同,Cu,Zn,Cd含量在煤矸石山剖面表现为0~10 cm>10~30 cm>30~50 cm,Pb和As含量表现为30~50 cm>10~30 cm>0~10 cm。Zn和As随着香根草种植年限的增加减小的趋势较为明显,Cu和Cd随着香根草种植年限增加呈现出先快后慢的趋势,Pb含量在香根草种植6 a后急剧减小,之后变化不显著。试验结果可以为煤矸石基质的生态恢复和治理以及土壤再利用提供详实的理论依据和较为准确的评价体系。Abstract: Vetiveria zizanioides L. were planted on the coal spoil-heaps in Dahe coal mine located at Liupanshui in Guizhou province to improve the vegetation restoration and ecological management in 2002,2005,2007,2009, and 2013,respectively. Soil samples were taken from these different areas to measure the contents of Cu,Zn,Cd,Pb and As for evaluating the effect of different planting years of vetiver on the distribution of heavy metals in coal spoil-heaps. Re- sults show that the contents of five heavy metals are decreasing with the increase of vetiver planting years. The contents of Cu,Zn and Cd in coal spoil-heap soil were higher in 0-10 cm than in 10-20 cm and 20-30 cm (P 10-30 cm>0-10 cm ( P
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