施用超富集植物生物炭对土壤性质及玉米苗期生长的影响
Effects of Hyperaccumulator Biochar Application on Soil Properties and Seedling Growth of Maize
查看参考文献39篇
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文摘
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植物提取修复是目前研究较多且极具发展前景的重金属污染土壤治理技术,广泛应用于砷、镉、铜、锌等重金属污染土壤的修复。然而,植物提取土壤重金属后产生大量植物残体的处置成为目前环境治理的难点。本研究通过将超富集植物伴矿景天和苎麻收割后制备成生物炭(350 ℃)进行盆栽实验,观测了超富集植物生物炭对玉米生长的影响,评估了超富集植物炭化处理的可行性。结果显示:添加苎麻生物炭(ZM)可以显著减少玉米地上部氮磷含量,但对生物量、光合等指标无显著影响,同时玉米地上及地下部分重金属Zn、Cd含量稍有增加;而添加景天生物炭处理(JT)玉米的总生物量相比对照降低了44.4%,蒸腾速率等光合参数也显著低于对照处理,根体积、根表面积和总投影面积分别降低了35.1%、28.1%和28.1%,玉米地上部和根部Zn含量为对照的16.0、21.7倍,Cd含量为对照的11.6、25.8倍。结合原材料以及生物炭中Zn、Cd含量分析,其差异主要由苎麻、景天中Zn、Cd含量不同所致,景天和苎麻自身重金属含量是决定其是否可以生物炭化并应用于农田的关键因素。 |
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其他语种文摘
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Phytoextraction is a promising remendiation technology for removal heavy metal from the contaminated soil, which has been widely used in the remediation of heavy metal contaminated soil such as arsenic, cadmium, copper and zinc. However, the disposal of a large amount of plant residues after extraction of heavy metals from soil has become a difficulty in current environmental governance. In this study, a pot experiment was conducted to observe the effect of hyperaccumulator biochar on maize growth and to assess the feasibility of hyperaccumulator charring treatment by preparing hyperaccumulator from Sedum plumbizincicola and Boehmeria nivea (L.) Gaudich harvested into biochar (350 ℃). The results showed that the addition of Boehmeria nivea (L.) Gaudich biochar (ZM) had no significant effect on biomass, photosynthesis and other indicators, except for a significant reduction in the N and P content of the shoot of the maize, the contents of heavy metals Zn and Cd in maize increased slightly; while the photosynthetic characteristics parameters such as transpiration rate of maize treated with Sedum plumbizincicola biochar (JT) were significantly lower than those of the control, with a 44.4% reduction in total biomass compared to the control. The root volume, root surface area and total projected area were reduced by 35.1%, 28.1% and 28.1%, respectively, and the Zn content in the shoot and root of maize was 16.0 and 21.7 times higher than that of the control, while the Cd content was 11.6 and 25.8 times higher than that of the control. Combined with the analysis of biochar raw materials and the contents of heavy metals Zn and Cd in biochar, the above differences were mainly caused by the differences of heavy metals in Boehmeria nivea (L.) Gaudich and Sedum plumbizincicola. These studies indicated that the heavy metal content of Sedum plumbizincicola and Boehmeria nivea (L.) Gaudich was the key factor to determine whether it could be carbonized and applied to farmland. |
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来源
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地球与环境
,2022,50(6):923-932 【核心库】
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DOI
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10.14050/j.cnki.1672-9250.2022.050.082
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关键词
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超富集
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生物炭
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再利用
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玉米
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地址
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1.
华中农业大学资源与环境学院, 农业部长江中下游耕地保育重点实验室, 武汉, 430070
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中国科学院地球化学研究所, 环境地球化学国家重点实验室, 贵阳, 550081
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贵州省农业科学院辣椒研究所, 贵阳, 550000
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贵州大学资源与环境工程学院, 贵阳, 550025
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贵州大学农学院, 贵阳, 550025
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1672-9250 |
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学科
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环境科学基础理论;环境污染及其防治 |
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基金
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国家重点研发项目
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贵州省项目
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文献收藏号
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CSCD:7374554
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