| 引用本文: | 孙向辉,蔡寒玉,赵 京,等.黏土矿物与磷肥复配对潮土中镉钝化效果及麦苗Cd吸收的影响[J].灌溉排水学报,2020,39(9):20-25. |
| SUN Xianghui,CAI Hanyu,ZHAO Jing,et al.黏土矿物与磷肥复配对潮土中镉钝化效果及麦苗Cd吸收的影响[J].灌溉排水学报,2020,39(9):20-25. |
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| 摘要: |
| 【目的】探究不同黏土矿物及其与磷肥复配对潮土镉（Cd）钝化和小麦苗期Cd吸收的影响，为我国北方地区弱碱性土壤小麦Cd污染治理提供参考。【方法】采用室内盆栽试验，以不添加钝化材料为对照（CK），研究了海泡石、凹凸棒土、膨润土1%和2%添加量以及与0.04%磷酸二氢钾复配对土壤pH值、土壤有效态Cd、苗期小麦生长及Cd吸收的影响。【结果】不同处理均能提高土壤pH值，显著降低土壤有效Cd量，降幅为5.84%~17.53%，同时促进苗期小麦生长，显著降低苗期小麦植株对Cd的积累，使地上部、根部Cd量分别下降40.66%~63.35%和18.49%~38.83%。3种黏土矿物降镉水平存在一定差异，表现为海泡石＞凹凸棒土＞膨润土，与磷肥复配可进一步增强其钝化Cd效果。【结论】对于北方Cd污染潮土，1%海泡石+0.04%磷酸二氢钾复配对土壤酸碱环境影响较小，且钝化Cd效果显著，可作为一种有效的原位钝化修复措施。 |
| 关键词: 黏土矿物；磷肥；潮土；镉；小麦 |
| DOI：10.13522/j.ggps.2020070 |
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| The Effects of Coupling Clay and Phosphorus Fertilization on Passivation and Uptake of Cadmium by Wheat Seedling in Fluvo-aquic Soil |
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SUN Xianghui, CAI Hanyu, ZHAO Jing, TIAN Yingying, DU Zhenjie, NIU Decao
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1. Henan Institute of Technology, Xinxiang 453002, China;2. Farmland Irrigation Research Institute, Chinese Academy of Agricultural Sciences, Xinxiang 453002, China;3. Laboratory of Organic Solid Waste Treatment and Resource Utilization, Henan Institute of Technology, Xinxiang 453003, China
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| Abstract: |
| 【Background】Cadmium (Cd) pollution accounts for 7.0% of soil contamination by heavy metals in China. Since Cd is a nonessential element for plants and but bioavailable for crops to take up, understanding the factors that modulate Cd mobility and its remediation is critical to safeguarding agricultural production and improving sustainable utilization of soil resource.【Objective】The purpose of this paper is to investigate the efficacy of combining clay and phosphorus fertilization as a technique to passivate Cd in a Fluvo-aquic soil and thereby to reduce its uptake by wheat seedlings.【Method】Pot experiments were conducted to evaluate the effects of applying sepiolite, attapulgite, bentonite in combination with potassium dihydrogen phosphate on soil pH, Cd bioavailability, growth and Cd uptake by the wheat.【Result】All treatments increased soil pH and significantly reduced bioavailable Cd in soil by 5.84%~17.53%. They also boosted growth of the wheat seedlings and reduced Cd content in shoots by 40.66%~63.35% and Cd content in the roots by 18.49%~38.83%, compared to the control. The passivation effect of the clays on Cd was ranked in sepiolite>attapulgite>bentonite, which could be further enhanced by adding phosphorus fertilizer.【Conclusion】Combing sepiolite (1%) and phosphorus fertilizer (0.04%) was most effective for in situ remediation of Cd-polluted Fluvo-aquic soil, with little effect on soil pH. |
| Key words: clays; phosphorus fertilizer; fluvo-aquic soil; cadmium contamination; winter wheat |
