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首页> 美国卫生研究院文献>Saudi Journal of Biological Sciences >Conocarpus biochar as a soil amendment for reducing heavy metal availability and uptake by maize plants
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Conocarpus biochar as a soil amendment for reducing heavy metal availability and uptake by maize plants

机译：赤果生物炭作为土壤改良剂可减少玉米中重金属的利用和吸收

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The objective of this study was to assess the use of Concarpus biochar as a soil amendment for reducing heavy metal accessibility and uptake by maize plants (Zea mays L.). The impacts of biochar rates (0.0, 1.0, 3.0, and 5.0% w/w) and two soil moisture levels (75% and 100% of field capacity, FC) on immobilization and availability of Fe, Mn, Zn, Cd, Cu and Pb to maize plants as well as its application effects on soil pH, EC, bulk density, and moisture content were evaluated using heavy metal-contaminated soil collected from mining area. The biochar addition significantly decreased the bulk density and increased moisture content of soil. Applying biochar significantly reduced NH4OAc- or AB-DTPA-extractable heavy metal concentrations of soils, indicating metal immobilization. Conocarpus biochar increased shoot dry biomass of maize plants by 54.5–102% at 75% FC and 133–266% at 100% FC. Moreover, applying biochar significantly reduced shoot heavy metal concentrations in maize plants (except for Fe at 75% FC) in response to increasing application rates, with a highest decrease of 51.3% and 60.5% for Mn, 28% and 21.2% for Zn, 60% and 29.5% for Cu, 53.2% and 47.2% for Cd at soil moisture levels of 75% FC and 100% FC, respectively. The results suggest that biochar may be effectively used as a soil amendment for heavy metal immobilization and in reducing its phytotoxicity.
机译：这项研究的目的是评估使用康卡普斯生物炭作为土壤改良剂，以减少玉米对重金属的吸收和吸收（Zea mays L.）。生物炭比率（0.0、1.0、3.0和5.0％w / w）和两种土壤水分水平（田间持水量的75％和100％，FC）对铁，锰，锌，镉，铜的固定化和有效性的影响利用从矿区收集的重金属污染土壤，评估了玉米中铅和铅的含量及其对土壤pH，EC，容重和水分含量的影响。添加生物炭显着降低了土壤的堆积密度并增加了土壤的水分含量。施用生物炭可显着降低土壤中NH4OAc或AB-DTPA可提取的重金属浓度，表明金属固定化。赤果生物炭使玉米植株的茎干生物量在75％FC时增加54.5–102％，在100％FC时增加133–266％。此外，随着施用量的增加，生物炭的施用显着降低了玉米植株中芽重金属的浓度（铁含量为75％FC时除外），其中锰含量最高降低了51.3％和60.5％，锌含量最高降低了28％和21.2％，土壤水分水平分别为75％FC和100％FC时，Cu分别为60％和29.5％，Cd为53.2％和47.2％。结果表明，生物炭可以有效地用作土壤改良剂，以固定重金属并降低其植物毒性。

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