摘要
广西环江沿岸农田土壤具有强酸、多重金属污染等特点,失去了农业生产能力,为此,本研究试用了土壤淋溶实验探究不同类型改良剂(生石灰、钙镁磷肥、有机肥、聚丙烯酰胺)组合对广西环江沿岸污染土壤的修复效果,土壤重金属迁移规律及对农田适耕性的影响.结果表明,对照组T1土壤酸化严重,降低清洁接触土壤层p H值,而处理方式T2、T3、T4、T5均能显著提高污染土壤p H值(P<0.05),对供试土壤p H变化大小分别为2.7~3.2、1.6~2.7,均能达到南方农业生产土壤p H值范围.较对照组T1,在污染土壤0~20 cm处,处理方式T2、T3、T4、T5能有效地活化Pb,钝化Zn的作用;在清洁土壤20~60cm处,各个处理方式对DTPA-Pb、DTPA-Zn的作用不存在显著差异(P<0.05).较对照组T1,处理方式T4、T5能为植物提供良好的种植营养物质,以期能为今后结合生物修复等措施提供技术支撑.
Due to the collapse of the Pb / Zn tailing dam of Huanjiang,Guangxi,the farmland along Huanjiang River are strongly acidic and heavy metal-contaminated,resulting in the loss of agricultural production. To explore some remedies and the migration of heavy metals in heavy metal contaminated-soil of Huanjiang,this study investigated the effects of different types of amendments( lime,calcium magnesium phosphate,organic fertilizer,polypropylene amide) on tested soils through soil leaching test. The results showed that T1 soil was severely acidified,reducing the p H of the soil layer to clean contact,while T2,T3,T4,T5 could significantly improve the contaminated soil p H,ranging from 2. 7 to 3. 2,1. 6 to 2. 7 respectively. Compared with T1,in the contaminated soil at 0-20 cm,T2,T3,T4,T5 could effectively activate Pb and immobilize Zn. Compared with T1,in 20-60 cm clean soil,there was no significant differences in the effect of different treatments on DTPA-Pb and DTPA-Zn( P < 0. 05). Compared with T1,T4 and T5 could provide good growing conditions for plants,which might provide technical support for future measurements such as bioremediation.
出处
《环境科学》
EI
CAS
CSCD
北大核心
2015年第6期2306-2313,共8页
Environmental Science
基金
国家自然科学基金项目(41161056)
广西"八桂学者"建设工程专项
广西自然科学基金重大项目(2013GXNSFEA053002)
关键词
改良剂
土壤
修复
铅
锌
酸化
广西环江
amendments
soil
remediation
lead
zinc
acidification
Huanjiang,Guangxi
