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首页> 外文期刊>Water, Air, and Soil Pollution >Effect of Biochar and Coal Fly Ash Soil Amendments on the Leaching Loss of Phosphorus in Subtropical Sandy Ultisols
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Effect of Biochar and Coal Fly Ash Soil Amendments on the Leaching Loss of Phosphorus in Subtropical Sandy Ultisols

机译：生物炭和粉煤灰土壤改良剂对亚热带沙质溶胶中磷淋失的影响

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摘要

Leaching of phosphorus fertilizer from loose-structured subtropical soils is a major course of agricultural water pollution in southeastern USA. Soil amendments play a major role in the phosphorus retention in soil through different mechanisms. In the present study we tested the effect of two soil amendments; biochar and coal fly ash in immobilizing the soluble phosphorus fertilizer added to sandy Ultisol soils from subtropical USA. Column leaching tests were conducted with Ultisol soil added with biochar (from avocado branch cut biomass) and coal fly ash at 5 tons/ha rate, under simulated rainfall, to collect the leachate over five pore volumes. The leachate was analyzed for the phosphate phosphorus content. In the end, the soil columns were carefully extracted, sectioned and analyzed for the total phosphorus, after acid digestion. Results showed 50% and 6% drop of soluble phosphorus leaching loss in biochar and coal fly ash added soil respectively. Soil amendments have shifted the loosely bound phosphorus into the Ca/Mg bound and Al/Fe/Mn bound pools which are not readily water extractable. Addition of biochar and coal fly ash together showed a synergistic interaction effect in reducing the leaching loss of phosphorus which needs further investigation to understand the exact mechanism.
机译：从松散的亚热带土壤中浸出磷肥是美国东南部农业用水污染的主要过程。土壤改良剂通过不同的机制在土壤中的磷保持中起主要作用。在本研究中，我们测试了两种土壤改良剂的效果。生物炭和粉煤灰固定来自美国亚热带的沙质Ultisol土壤中添加的可溶性磷肥。在模拟降雨条件下，以5吨/公顷的速率在Ultisol土壤中添加生物炭（鳄梨分枝生物质）和粉煤灰，进行柱浸试验，以收集五个孔体积的渗滤液。分析渗滤液的磷酸盐磷含量。最后，酸解后，仔细提取土壤柱，切片并分析总磷。结果表明，生物炭和粉煤灰添加土壤中可溶性磷的淋失损失分别下降了50％和6％。土壤改良剂将松散结合的磷转移到了钙/镁结合池和铝/铁/锰结合池中，这些池不易用水提取。生物炭和粉煤灰的共同添加在减少磷的浸出损失方面表现出协同的相互作用，需要进一步研究以了解确切的机理。

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  • 来源
    《Water, Air, and Soil Pollution》 |2020年第2期|56.1-56.10|共10页
  • 作者

  • 作者单位

    Univ Florida Inst Food & Agr Sci Soil & Water Sci Div Trop Res & Educ Ctr Homestead FL 33031 USA|Sch Technol Sri Lanka Technol Campus Padukka 10500 Victoria Sri Lanka;

    Univ Florida Inst Food & Agr Sci Soil & Water Sci Div Trop Res & Educ Ctr Homestead FL 33031 USA;

    Monash Univ Dept Civil Engn Clayton Campus Melbourne Vic 3800 Australia;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Phosphorus leaching; biochar; coal fly ash; acidic soil;

    机译：磷浸出;生物炭粉煤灰酸性土壤;

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