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Phosphorus and Heavy Metal Attachment and Release in Sandy Soil Aggregate Fractions

机译：磷和重金属在沙质土壤聚集体中的附着和释放

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摘要

The presence of P and heavy metals in different forms or in association with different size fractions influences availability and discharge of these elements from watersheds. Understanding the association of P and heavy metals with size fractions can improve evaluation of leaching potential of P and heavy metals from soils. In this study, five aggregate-size fractions, ranged from 1.00 to 0.50 to <0.053 mm, were separated from seven Florida sandy soils by dry sieving. Each aggregate fraction was characterized by phosphate sorption, sequential fractionation of P, total, water- and Mehlich III-extractable concentrations of P and heavy metals. Size differences in sand, silt, and clay aggregates influence the amount and strength of element binding. Elemental attachment (particularly heavy metals) increased with decreasing aggregate sizes. Phosphorus and heavy metals in the sandy soils are readily transported to surface waters with suspended fine particles. Higher percentages of water-extractable, Mehlich III-extractable P, and heavy metals were found in both the 0.50- to 0.25- and 0.25- to 0.125-mm aggregate fractions, suggesting that P and heavy metals in these two fractions had higher release potential. The sequential fractionation of P suggested that the 1.00- to 0.50-mm fraction contained a larger percentage of Ca-bound P, whereas the 0.50- to 0.25-, 0.25- to 0.125-, and 0.125- to 0.053-mm fractions had higher ratios of labile P (H2O-P and NaHCO3–P). Phosphorus release from smaller aggregate fractions is faster with a higher P1/P168 ratio than from larger aggregate fractions because of larger amounts of water soluble P attached in the smaller aggregate fractions.
机译：P和重金属以不同的形式存在或以不同的大小比例存在于 关联中，会影响流域中元素的有效性 和排放。理解 P和重金属与尺寸分数的关系可以 改善土壤中P和重金属 的浸出潜力评估。在这项研究中，通过干燥筛分从七个 Florida沙土中分离了五个骨料级分，范围从 从1.00到0.50到<0.053 mm。每个聚集部分 的特征在于磷酸盐吸附，P的顺序分馏 ，总和，水和Mehlich III可萃取的P和重金属的浓度 。 。沙子，粉砂和粘土中的大小差异 会影响元素结合的数量和强度。 元素附着（尤其是重金属）随着 减小而增加聚合大小。沙质土壤中的磷和重金属很容易被悬浮的细颗粒运输到地表水中。在0.50- 至0.25-和0.25-至0.125-mm的总级分中发现了较高比例的水可萃取，Mehlich Ⅲ和重金属含量，暗示 这两个馏分中的P和重金属具有更高的释放 电位。 P的顺序分馏表明， 1.00-0.50 mm的分数包含较大百分比的 钙结合的P，而0.50- 0.25至0.25- 0.25- 0.125-， 和0.125-0.053毫米级分的不稳定 P（H 2 OP和NaHCO 3 –P）。 P 1 / P 168 比率较高时，较小的 聚集部分中的磷释放速度快于较大聚集体部分中的 因为较大的 水溶性P附着在较小的聚集部分中。

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  • 来源
    《Soil Science Society of America Journal》 |2003年第4期|1158-1167|共10页
  • 作者

    M. K. Zhang; Z. L. He; D. V. Calvert; P. J. Stoffella; X. E. Yang; Y. C. Li;

  • 作者单位

    University of Florida, Institute of Food and Agricultural Sciences, Indian River Research and Education Center, 2199 South Rock Road, Fort Pierce, FL 34945,University of Florida, Institute of Food and Agricultural Sciences, Tropical Research and Education Center, Homestead, FL 33031;

    University of Florida, Institute of Food and Agricultural Sciences, Indian River Research and Education Center, 2199 South Rock Road, Fort Pierce, FL 34945,University of Florida, Institute of Food and Agricultural Sciences, Tropical Research and Education Center, Homestead, FL 33031;

    University of Florida, Institute of Food and Agricultural Sciences, Indian River Research and Education Center, 2199 South Rock Road, Fort Pierce, FL 34945,University of Florida, Institute of Food and Agricultural Sciences, Tropical Research and Education Center, Homestead, FL 33031;

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