矿物-有机质复合调理剂对Pb污染土壤的改良效果

蔡如梦; 石林

文章摘要

蔡如梦,石林.矿物-有机质复合调理剂对Pb污染土壤的改良效果[J].农业环境科学学报,2017,36(12):2438-2444.

矿物-有机质复合调理剂对Pb污染土壤的改良效果

Amelioration effects of mineral-organic compound conditioner on Pb-contaminated soil

投稿时间：2017-06-21

DOI：10.11654/jaes.2017-0887

中文关键词: 钾钙硅肥褐煤腐植酸土壤改良重金属Pb 小白菜

英文关键词: potassium calcium silicon fertilizer brown coal huminite soil amelioration Pb pakchoi

基金项目:国家科技支撑计划项目（2015BAD05B05+2）；广州市2016年污染防治新技术新工艺示范和应用项目

作者	单位	E-mail
蔡如梦	华南理工大学环境与能源学院, 广州 510006 工业聚集区污染控制与生态修复教育部重点实验室, 广州 510006
石林	华南理工大学环境与能源学院, 广州 510006 工业聚集区污染控制与生态修复教育部重点实验室, 广州 510006	celshi@126.com

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中文摘要:

为了探究矿物-有机质复合调理剂对Pb污染土壤的改良效果，通过小白菜盆栽试验研究了矿物-有机质复合调理剂（钾钙硅肥+褐煤腐植酸）对土壤理化性质、土壤有效态Pb含量、小白菜生长情况及小白菜吸收Pb的影响。试验结果表明：施加复合调理剂能显著降低土壤有效态Pb含量（施加量达到2 g·kg^-1时，比对照降低67.47%），提高土壤pH值（从5.34到6.25）和土壤有机质含量（10.98%~13.41%）；施加复合调理剂后，土壤中矿物质元素（K、Ca、Mg、Si）有效态含量均有不同程度的提高，其中施加量与土壤中有效Ca和Si元素含量具有显著相关性。另外，施加复合调理剂能有效降低小白菜中Pb含量以及促进小白菜的生长。与对照相比，小白菜生物量和株高分别提高22.79%~49.90%和2.91%~7.15%，且均与复合调理剂施加量呈显著正相关。矿物-有机质复合调理剂不仅能改善土壤理化性质，降低土壤有效态Pb含量，减少Pb在小白菜根部和地上部分的累积，而且能提升土壤养分供应能力，可在实际中有效践行。

英文摘要:

In this study, a pot experiment was conducted to investigate the effects of a mineral-organic compound conditioner (potassium calcium silicon fertilizer + brown coal huminite) on soil pH, organic matter content, available Pb concentration, growth of pakchoi, and Pb uptake by pakchoi. Compared to the control, application of the compound conditioner decreased the concentrations of available Pb in soil (by 67.47% at 2 g·kg^-1 of compound conditioner) and elevated the soil pH (from 5.34 to 6.25) and soil organic matter content (by 10.98%~13.41%). The concentrations of mineral nutrients (K, Ca, Mg, Si) in the soil increased to various degrees, and the application rates of the compound conditioner had significant positive correlation with soil available Ca and Mg. Applying the compound conditioner could effectively reduce Pb concentrations in the shoot and root of pakchoi. The biomass and stem length of pakchoi increased by 22.79%~49.90% and 2.91%~7.15%, respectively, and both had significant positive correlations with application rates of the compound conditioner. In conclusion, the compound conditioner could effectively ameliorate soil physicochemical properties, decrease bioavailability of Pb in soil, suppress the harmful effects of Pb on crop growth, and enhance soil nutrient supply capacity. The compound conditioner can be used for in situ remediation of heavy-metal-contaminated soil.

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