湖北农业科学 ›› 2019, Vol. 58 ›› Issue (24): 88-92.doi: 10.14088/j.cnki.issn0439-8114.2019.24.021

• 资源·环境 • 上一篇    下一篇

天然火成岩对不同污染程度土壤镉生物有效性的影响

张志毅1, 2, 聂新星1, 2, 杨利1, 2, 范先鹏1, 2, 余延丰1, 2, 丁鲁平3, 4   

  1. 1.湖北省农业科学院植保土肥研究所/湖北省农业面源污染防治工程技术研究中心/农业农村部废弃物肥料化利用重点实验室/农业环境治理湖北省工程研究中心,武汉 430064;
    2.农业农村部潜江农业环境与耕地保育科学观测实验站,湖北 潜江 433116;
    3.博莱生态农业科技有限公司,北京 100089;
    4.Boreal Agrominerals Inc.,Ontario P3Y1M9,Canada
  • 收稿日期:2019-06-06 出版日期:2019-12-25 发布日期:2019-12-25
  • 通讯作者: 杨 利(1966-),男,湖北潜江人,研究员,主要从事土壤改良与高效施肥方面的研究工作, (电话)027-88430572(电子信箱)516416134@qq.com。
  • 作者简介:张志毅(1988-),男,河北邢台人,助理研究员,博士,主要从事农田重金属修复、土壤培肥研究,(电话)18627058557(电子信箱)zzyouxin@163.com
  • 基金资助:
    国家重点研发计划项目(2017YFD0801003); 湖北省农业科学院青年科学基金项目(2018NKYJJ07; 2018NKYJJ05); 中央公益性协同创新联盟专项(2018LM); 湖北省农业科技创新中心项目(2016-620-000-001-019)

Effects of natural igneous rocks on bioavailability of cadmium in soils with different pollution levels

ZHANG Zhi-yi1, 2, NIE Xin-xing1, 2, YANG Li1, 2, FAN Xian-peng1, 2, YU Yan-feng1, 2, DING Lu-ping3, 4   

  1. 1.Institute of Plant Protection and Soil Fertilizer,Hubei Academy of Agricultural Sciences/Hubei Engineering Research Center for Agricultural Non-point Source Pollution Control/Key Laboratory of Fertilization from Agricultural Wastes,Ministry of Agriculture and Rural Affairs/Hubei Engineering Research Center for Agricultural Environment Management,Wuhan 430064,China;
    2.Qianjiang Scientific Observing and Experimental Station of Agro-Environment and Arable Land Conservation, Ministry of Agriculture and Rural Affairs, Qianjiang 430064,Hubei, China;
    3.Bolai Ecological Agriculture Technology Co.,Ltd.,Beijing 100089,China;
    4.Boreal Agrominerals Inc.,Ontario P3Y1M9,Canada
  • Received:2019-06-06 Online:2019-12-25 Published:2019-12-25

摘要: 为明确天然火成岩(SRC)对重金属镉(Cd)污染土壤的钝化效果,采用大田试验和盆栽试验相结合的方法,通过在超过农用地污染风险筛选值土壤(CG和LQ)和风险管控值土壤(JH)中添加SRC,研究其对土壤有效Cd、Cd形态分布以及水稻各部位Cd含量的影响。结果表明,SRC明显改变CG和LQ土壤有效Cd、pH、Cd形态分布和水稻不同部位Cd含量,而对JH土壤影响不大。添加SRC后,CG和LQ土壤pH提高了约0.2,显著降低了CG和LQ土壤CaCl2-Cd(0.01 mol/L CaCl2提取)含量,降幅在27.3%~38.9%。Cd形态分析表明,SRC能够使CG和LQ土壤植物易吸收态Cd向植物难吸收态Cd转变,酸容态Cd含量分别降低了6%~14%,铁锰氧化态Cd和有机结合态Cd分别增加了8%~9%。大田条件下,SRC显著抑制水稻根系、秸秆和子粒种对Cd的吸收,降幅分别达到53.7%、69.8%和54.6%。SRC通过提高土壤pH以及所含矿物对Cd的吸附来降低土壤中Cd的生物有效性,抑制水稻对Cd的吸收。

关键词: 碳酸盐岩, 镉, 重金属形态, 土壤修复, 水稻

Abstract: In order to determine the passivation effect of natural Spanish river carbonatite(SRC) on heavy metal cadmium (Cd) contaminated soils, field and pot experiments were used to study the distribution of available Cd, Cd forms and Cd of different rice parts by adding SRC in soils exceeding the risk screening values (CG and LQ) and risk control values (JH). The results showed that SRC significantly changed soil available Cd, pH, Cd forms and Cd content in different parts of rice in CG and LQ soils, but had little effect on JH soil. When SRC was added, soil pH of CG and LQ increased by about 0.2, significantly reduced the contents of CaCl2-Cd(0.01 mol/L CaCl2 extraction) in CG and LQ soils, and the reduction ranged from 27.3% to 38.9%. Forms analysis of Cd showed that SRC could change Cd from easily absorbed Cd by plants to hardly absorbed Cd in CG and LQ soil change. The content of acidic Cd decreased by 6%~14% and the content of iron-manganese oxidized Cd and organic bound Cd increased by 8%~9%, respectively. Under field conditions, SRC significantly inhibited Cd uptake by rice roots, straws and grains, with decreases of 53.7%, 69.8% and 54.6%, respectively. SRC can reduce the bioavailability of Cd in soils by increasing soil pH and adsorbing Cd by minerals, and inhibit the absorption of Cd by rice.

Key words: carbonate rocks, cadmium, heavy metal fraction, soil remediation, paddy rice

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