石灰、腐植酸单施及复配对污染土壤铅镉生物有效性的影响

doi:10.19741/j.issn.1673-4831.2019.0261

摘要/Abstract

摘要： 以广东省韶关市某农田铅（Pb）、镉（Cd）污染土壤为研究对象，通过盆栽试验研究在Pb、Cd污染土壤中单一及复合添加石灰（w=0.2%）和腐植酸（w=1%、2%和5%）对土壤理化性质、土壤有效态Pb和Cd含量、黑麦草（Lolium perenne）生长以及黑麦草吸收Pb和Cd的影响，以此探讨石灰和腐植酸对土壤Pb、Cd生物有效性的调控效率。结果表明，单施石灰和石灰配施腐植酸处理均能提高土壤pH，显著降低土壤中有效态Pb、Cd含量，特别是石灰配施5%腐植酸处理使有效态Pb、Cd含量较对照分别降低89.45%和89.63%。单施腐植酸和石灰配施腐植酸处理均能显著提高土壤有机质含量，促进黑麦草生长，降低黑麦草对Pb、Cd的吸收，其中石灰配施5%腐植酸处理黑麦草地上部Pb吸收量显著小于其他处理，较对照降低48.52%；单施5%腐植酸处理黑麦草地上部Cd吸收量显著小于其他处理，较对照降低59.62%。石灰和腐植酸共同施用对土壤Pb、Cd生物有效性的调控效率优于单施腐植酸或石灰，石灰与腐植酸之间存在明显交互作用。

关键词: 石灰, 腐植酸, 黑麦草, 铅镉复合污染

Abstract: Lead (Pb) and cadmium (Cd) contaminated soil in a farmland in Shaoguan City, Guangdong Province was studied. A pot experiment was conducted to study the effects of single and multiple application of lime (w=0.2%) and humic acid (w=1%, 2% and 5%) to Pb and Cd contaminated soil on soil physical and chemical properties, available Pb and Cd content, Pb and Cd absorption and growth of ryegrass (Lolium perenne). Based on this, the regulation efficiency of lime and humic acid on Pb and Cd bioavailability in soil was discussed. Results show that the soil pH could be improved by the application of single lime or lime combined with humic acid treatment, while the concentrations of available Pb and Cd in soil was significant reduced. Especially, as compared with control, the content of available Pb and Cd decreased by 89.45% and 89.63%, respectively, when lime was mixed with 5% humic acid. There was a significant increase in the content of soil organic matter and the growth of ryegrass with application of single humic acid or lime combined with humic acid. There was a significant decrease in the absorption of Pb and Cd by ryegrass. The Pb absorption in the aboveground part of treatment with lime + 5% humic acid was significantly lower than those of other treatments, which was about 48.52% lower than that of the control. The Cd absorption in the aboveground part of treatment with single 5% humic acid was significantly lower than those of other treatments, which was about 59.62% lower than that of the control. Besides, the regulation efficiency of bioavailability of Pb and Cd in soil by the combined application of lime and humic acid was better than that of single humic acid or lime. There was a significant interaction between lime and humic acid.

Key words: lime, humic acid, ryegrass (Lolium perenne), combined contamination of lead and cadmium

中图分类号:

曾秀君, 程坤, 黄学平, 傅志强, 何国庆. 石灰、腐植酸单施及复配对污染土壤铅镉生物有效性的影响[J]. 生态与农村环境学报, 2020, 36(1): 121-128.

ZENG Xiu-jun, CHENG Kun, HUANG Xue-ping, FU Zhi-qiang, HE Guo-qing. Effect of Single and Multiple Application of Lime and Humic Acid on the Bioavailability of Lead and Cadmium in Contaminated Soil[J]. Journal of Ecology and Rural Environment, 2020, 36(1): 121-128.

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