生物炭对铜矿区污染土壤微生物活性及香根草富集铜、镉、铅的影响
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X53

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国家自然科学基金项目(41661065);安徽省科技厅自然科学基金项目(2108085MD128);安徽高校协同创新项目(GXXT-2020-075)


Effects of Soil Microbial Activity and Cu, Cd, Pb Enrichment of Vetiveria zizanioides to Biochar Addition in Contaminated Soil in Copper Mining Area
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    摘要:

    矿区土壤易发生重金属污染,是土地资源利用和维护的一大难题。以铜矿区污染土壤为研究对象,按质量比添加0,1%,2%,4%,10% (w/w)的生物炭,进行香根草室内盆栽试验。研究添加生物炭对土壤pH和微生物活性、香根草富集与转运重金属的影响,探明重金属形态含量与生物炭、微生物活性的相关性,旨在为生物炭与香根草联合修复矿区重金属污染土壤提供理论参考。结果表明:生物炭的添加能提高土壤pH,显著提高土壤FDA水解酶、蔗糖酶和脲酶活性,显著促进土壤基础呼吸,但对土壤微生物量碳无显著影响;生物炭的添加使香根草生物量显著增大,降低土壤Cu和Pb的有效态占比,Cd的变化与此相反;添加生物炭促进香根草对Cd和Pb的富集,降低香根草对Cu的富集,减少Cu、Cd和Pb在香根草体内的转运,因此香根草可作为Cu、Cd和Pb的稳定化植物。土壤蔗糖酶活性与香根草叶片Cu、Cd和Pb含量、有效态和残渣态Cu含量呈显著正相关,土壤基础呼吸与叶片Cu、Cd和Pb含量、有效态Cu、Pb含量呈显著负相关,而与有效态Cd含量呈显著正相关。总之,生物炭可减弱矿区土壤重金属对香根草生长的毒害作用,并促进香根草对重金属的富集,两者结合可改善铜矿区污染土壤的理化性质和微生物活性,有利于重金属污染土壤修复,改善土壤质量。

    Abstract:

    Soil in mining areas are easily to be contaminated by heavy metals, which fact is a major challenge for land resource utilization and maintenance. In the present study, the contaminated soil in copper mining area was used as the research material, and 0, 1%, 2%, 4%, and 10% (w/w) biochar were added by weight ratio to carry out an indoor potted experiment for planting Vetiveria zizanioides. The effects of biochar on soil pH and microbial activity, and the enrichment and transport of heavy metals by Vetiveria zizanioides were investigated to find out the correlations between the contents of heavy metal species, biochar and microbial activity, aiming to provide a theoretical reference for the combined remediation of heavy metal-contaminated soil in mining areas by biochar and Vetiveria zizanioides. The results showed that the addition of biochar increased soil pH, significantly increased the activities of soil FDA hydrolase, sucrase and urease, and significantly promoted soil basal respiration, but had no significant effect on soil microbial biomass carbon. The addition of biochar significantly increased the biomass of Vetiveria zizanioides, decreased the available state of Cu and Pb, while the changes of Cd species was opposite. The addition of high doses of biochar attenuated the enrichment of Cu in Vetiveria zizanioides, while the addition of biochar promoted the enrichment of Cd and Pb and attenuated the transport of Cu, Cd and Pb in Vetiveria zizanioides. So Vetiveria zizanioides could be used as a stabilized plant for Cu, Cd and Pb. Soil sucrase activity was significantly positively correlated with the contents of Cu, Cd and Pb in leaves, soil available state Cu and residual state Cu; soil basal respiration was significantly negatively correlated with the contents of Cu, Cd and Pb in leaves, available state Cu and available state Pb, while significantly positively correlated with available state Cd. In conclusion, biochar can reduce the toxic effect of heavy metals on the growth of Vetiveria zizanioides in mining soil and promote the enrichment of heavy metals by Vetiveria zizanioides, and the combination of both can improve the physicochemical properties and microbial activity of contaminated soil in copper mining areas. These findings are conducive to the remediation of heavy metal-contaminated soil and the improvement of soil quality.

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艾艳梅,汪洋,李佳琪,张辰阳,徐晓阳,冯今萍,周际海.生物炭对铜矿区污染土壤微生物活性及香根草富集铜、镉、铅的影响[J].水土保持学报,2022,36(6):402~409

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  • 收稿日期:2022-04-25
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  • 在线发布日期: 2022-12-01
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