| 方解石基组配钝化剂与低积累玉米协同修复效果 |
| 摘要点击 1538 全文点击 676 投稿时间：2021-06-02 修订日期：2021-08-22 |
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| 中文关键词 碱性土壤 镉和铅复合污染 方解石基组配钝化剂 低积累玉米 协同修复 |
| 英文关键词 alkaline soil cadmium and lead combined pollution calcite-based passivating agent low-accumulation maize collaborative repair |
| 作者 | 单位 | E-mail | | 任超 | 河南省地质矿产勘查开发局第一地质矿产调查院, 洛阳 471000
河南省金银多金属成矿系列与深部预测重点实验室, 洛阳 471000 | renchaodkyy@163.com | | 任彧仲 | 河南省地质矿产勘查开发局第一地质矿产调查院, 洛阳 471000
河南省金银多金属成矿系列与深部预测重点实验室, 洛阳 471000 | | | 李竞天 | 河南省地质矿产勘查开发局第一地质矿产调查院, 洛阳 471000 | | | 王浩 | 河南省地质矿产勘查开发局第一地质矿产调查院, 洛阳 471000 | | | 朱利文 | 河南省地质矿产勘查开发局第一地质矿产调查院, 洛阳 471000 | | | 肖建辉 | 河南省地质矿产勘查开发局第一地质矿产调查院, 洛阳 471000
河南省金银多金属成矿系列与深部预测重点实验室, 洛阳 471000 | | | 赵瑞 | 河南省地质矿产勘查开发局第一地质矿产调查院, 洛阳 471000 | | | 杜倩倩 | 河南省地质矿产勘查开发局第一地质矿产调查院, 洛阳 471000 | |
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| 中文摘要 |
| 针对典型北方碱性镉和铅复合污染农田土壤，开展土壤钝化与低积累农作物协同修复田间试验，以方解石作为主量钝化材料，分别复配少量熟石灰、沸石粉和生物炭形成组配钝化剂.研究在CL（方解石+熟石灰）、CZ（方解石+沸石）、CB（方解石+生物炭）和CLZB（方解石+熟石灰+沸石+生物炭）不同组配条件下，对土壤理化性质、重金属Cd和Pb生物有效性的影响，以及对低积累玉米产量和植株（茎叶和籽粒）重金属Cd和Pb含量的影响.结果表明：①施用钝化剂均能保障玉米正常生长，小幅提升玉米千粒重与玉米产量.②不同方解石基组配钝化剂处理对土壤理化性质的影响具有一定的差异性，CL、CZ、CB和CLZB处理对土壤pH分别提升0.46、0.25、0.12和0.13个单位，对土壤肥力指标无显著相关性（P>0.05）.③不同方解石基组配钝化剂处理均能显著降低土壤Cd和Pb的DTPA浸提态和离子交换态含量，其中CLZB处理对DTPA浸提态Cd和Pb含量降低率分别为49.36%和72.55%，对离子交换态Cd和Pb含量降低率分别为55.39%和78.52%.④在不同组配钝化剂处理后可使低积累玉米茎叶和籽粒Cd和Pb含量进一步降低，其中CLZB处理后玉米茎叶Cd和Pb含量分别降低45.93%和67.00%，玉米籽粒Cd和Pb含量分别降低25.17%和46.62%，且DTPA浸提态和离子交换态Cd和Pb含量与玉米茎叶和籽粒中的Cd和Pb含量均呈极显著正相关关系（P<0.01）.结果表明，在修复北方中碱性土壤镉铅复合污染农田时，组配钝化剂与低积累作物品种联合使用能够获得较好的修复效果. |
| 英文摘要 |
| In this study, a field experiment of soil passivation and low accumulation-crops was carried out for typical northern alkaline cadmium and lead compound-polluted farmland soil. Calcite was used as the main passivation material, and a small amount of slaked lime, zeolite powder, and biochar were combined to form a group passivation agent. The effects of passivators on soil physicochemical properties, bioavailability of the heavy metals Cd and Pb, and the yield and plant (stalk and seed) content of heavy metals Cd and Pb in low-accumulation maize were investigated under different grouping conditions of calcite+slaked lime (CL), calcite+zeolite (CZ), calcite+biochar (CB), and calcite+slaked lime+zeolite+biochar (CLZB). The results showed that:① all applications of passivating agent ensured the normal growth of maize and slightly increased the 1000 grain weight and maize yield. ② The effects of different calcite-based passivators on soil physical and chemical properties were different. The CL, CZ, CB, and CLZB treatments increased soil pH by 0.46, 0.25, 0.12, and 0.13 units, respectively, but had no significant correlation with soil fertility index (P>0.05). ③ DTPA leaching and ion exchange state contents of Cd and Pb in soil could be significantly reduced by different calcite-based combinations with passivators, and the reduction rates of Cd and Pb in DTPA leaching were 49.36% and 72.55%, respectively. The reduction rates of ion exchange Cd and Pb contents were 55.39% and 78.52%, respectively. ④ The contents of Cd and Pb in stems, leaves, and grains of low-accumulation maize were further reduced by different passivating agents. The contents of Cd and Pb in the stems and leaves of maize were reduced by 45.93% and 67.00% after CLZB treatment, and the contents of Cd and Pb in grains were decreased by 25.17% and 46.62%, respectively. Moreover, the contents of Cd and Pb in DTPA extraction and ion exchange states were significantly positively correlated with the contents of Cd and Pb in corn stems, leaves, and grains (P<0.01). The results showed that the combined use of combination passivators and low-accumulation crop varieties can obtain better restoration effects in the remediation of cadmium and lead combined-polluted farmland in the middle alkaline soil in northern China. |
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