Effect of Heavy Metal Pollution on Potassium Behavior in Typic Udic Ferrisol

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Effect of Heavy Metal Pollution on Potassium Behavior in Typic Udic Ferrisol

机译：重金属污染对典型Udic Ferrisol钾行为的影响

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The indirect influence of heavy metal contamination of soil on nutrient availability, an important aspect of soil quality, may need to be taken into consideration when determining overall effects of heavy metals. Alaboratory experiment was performed to study the effects of combined pollution of Cu, Pb, Zn and Cd on soil K status as indicated by chemical fractions, adsorption-desorption and quantity/intensity (Q/I) relationship of K in a Typic Udic Ferrisol (generally called red soil), by employing uniform design and single factor design. Compared to the control, content of exchangeable K was decreased, but that of soluble K increased in the samples contaminated with heavy metals. Due to heavy metal pollution, potassium adsorption was reduced by 5% to 22%, whereas the desorption percentage of adsorbed K increased by 2% to 32%. The Q/I curves shifted downward, potassium buffering capacity (PBCK) decreased, and equilibrium activity ratio values (AROK) increased with increasing heavy metal pollution. These influences followed the sequences of Pb＞Cu＞Zn and combined pollution＞single one. Displacement of K from cation exchange sites and decrease in soil CEC due to heavy metals should be responsible for the changes of soil K behaviours. The findings suggest that heavy metal pollution of soil might aggravate the degradation of soil K fertility by decreasing K adsorption and buffering capacity and increasing desorption.

机译：在确定重金属的总体影响时，可能需要考虑土壤重金属污染对养分有效性的间接影响，这是土壤质量的重要方面。进行了一项实验室实验，研究了铜，铅，锌和镉的复合污染对土壤钾素状态的影响，其化学成分，典型的Udic Ferrisol中钾的吸附-解吸和量/强度（Q / I）关系表明通常称为红色土壤），采用统一设计和单因素设计。与对照相比，在被重金属污染的样品中，可交换钾的含量降低了，但可溶性钾的含量却增加了。由于重金属的污染，钾的吸附量减少了5％至22％，而吸附的K的解吸率却增加了2％至32％。随着重金属污染的增加，Q / I曲线向下移动，钾缓冲能力（PBCK）降低，平衡活性比值（AROK）升高。这些影响遵循Pb＞ Cu＞ Zn和综合污染＞单一的顺序。钾从阳离子交换位点的置换以及由于重金属引起的土壤CEC的降低应负责土壤K行为的变化。结果表明，土壤重金属污染可能通过降低钾的吸附和缓冲能力并增加解吸作用而加剧土壤钾肥的退化。

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《土壤圈（英文版）》 |2000年第1期|21-30|共10页
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Laboratory of Material Cycling in Pedosphere, Institute of Soil Science, the Chinese Academy of Sciences, rnP.O. Box 821, Nanjing 210008 (China);

Laboratory of Material Cycling in Pedosphere, Institute of Soil Science, the Chinese Academy of Sciences, rnP.O. Box 821, Nanjing 210008 (China);

Laboratory of Material Cycling in Pedosphere, Institute of Soil Science, the Chinese Academy of Sciences, rnP.O. Box 821, Nanjing 210008 (China);

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收录信息中国科学引文数据库(CSCD);
原文格式 PDF
正文语种 chi
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关键词
heavy metals; potassium behaviors; Typic Udic Ferrisol;

机译：重金属;钾行为;典型乌迪里索酚;

Effect of Heavy Metal Pollution on Potassium Behavior in Typic Udic Ferrisol

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