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首页> 外文期刊>Journal of plant nutrition and soil science >Redistribution of cadmium, copper, lead, nickel, and zinc among soil fractions in a contaminated calcareous soil after application of nitrogen fertilizers
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Redistribution of cadmium, copper, lead, nickel, and zinc among soil fractions in a contaminated calcareous soil after application of nitrogen fertilizers

机译：施氮肥后镉，铜，铅，镍，锌在受污染的石灰性土壤中的土壤组分中的重新分布

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摘要

This study was conducted to evaluate the redistribution of the heavy metals Cd, Cu, Pb, Ni, and Zn among different soil fractions by N fertilizers. In a lab experiment, soil columns were leached with distilled water, KNO_3, NaNO_3, NH_4NO_3, or Ca(NO_3)_2 · 4H_2O. After leaching, soil samples were sequentially extracted for exchangeable (EXCH), carbonate (CARB), organic-matter (OM), Mn oxide (MNO), Fe oxide (FEO), and residual (RES) fractions. Distilled water significantly increased the concentrations of Cd and Ni in EXCH fraction, while concentration of Cu and Zn did not change significantly. Application of KNO_3, NaNO_3, NH_4NO_3, or Ca(NO_3)_2 · 4H_2O significantly increased the concentrations of Cd and Zn in EXCH fraction, while concentration of Pb and Ni was decreased. Application of all fertilizers caused an increase of Cu in the OM fraction. Moreover, leaching with these solutions significantly increased Cd [except in Ca(NO_3)_2 · 4H_2O], Cu, and Zn concentrations in the CARB fraction, while Pb and Ni concentrations were decreased. With application of all leaching solutions, Zn in the EXCH, CARB, FEO, and MNO fractions was significantly increased, while Zn in the OM fraction did not change. The mobility index indicated that Ca(NO_3)_2 · 4H_2O increased the mobility of Cd, Cu, and Zn in the soil, whereas NaNO_3 decreased the mobility of Pb and Ni in the soil. The mobility index of Pb decreased by all leaching solutions. Thus, these results suggest that applying N fertilizers may change heavy-metal fractions in contaminated calcareous soil and possibly enhance metal mobility and that N-fertilization management therefore may need modification.
机译：进行了这项研究，以评估氮肥在不同土壤组分中重金属Cd，Cu，Pb，Ni和Zn的重新分布。在实验室实验中，用蒸馏水，KNO_3，NaNO_3，NH_4NO_3或Ca（NO_3）_2·4H_2O淋洗土壤柱。浸出后，依次提取土壤样品中的可交换（EXCH），碳酸盐（CARB），有机物（OM），氧化锰（MNO），氧化铁（FEO）和残留（RES）馏分。蒸馏水显着增加了EXCH馏分中Cd和Ni的浓度，而Cu和Zn的浓度没有显着变化。施用KNO_3，NaNO_3，NH_4NO_3或Ca（NO_3）_2·4H_2O可以显着增加EXCH馏分中Cd和Zn的浓度，而Pb和Ni的浓度则降低。所有肥料的施用都会导致OM分数中Cu的增加。此外，用这些溶液浸出显着增加了Cd [CARB级分中Ca（NO_3）_2·4H_2O除外]，Cu和Zn的浓度，而Pb和Ni的浓度降低了。通过使用所有浸提溶液，EXCH，CARB，FEO和MNO馏分中的Zn显着增加，而OM馏分中的Zn不变。迁移率指数表明Ca（NO_3）_2·4H_2O增加了Cd，Cu和Zn在土壤中的迁移率，而NaNO_3降低了Pb和Ni在土壤中的迁移率。所有浸出溶液均降低了铅的迁移率指数。因此，这些结果表明，施用氮肥可能会改变受污染的石灰质土壤中的重金属含量，并可能提高金属的迁移率，因此可能需要对氮肥管理进行调整。

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