钛白副产物对苏打盐碱土的化学改良
首发时间:2014-03-31
摘要:中国松嫩平原存在大片因理化性质恶化而难以改良利用的盐碱化土壤。本研究分析了钛白副产物(绿矾)对苏打碱土盐度、pH、交换性钠、碱化度和各形态铁含量的影响。结果表明:土壤盐度、pH、交换性钠和碱化度随绿矾施用量的逐渐增加而不断降低,绿矾施用量达到2%时,它们分别从对照的14.54 dSom-1、10.58、15.75 cmolokg-1和81.95%降低到7.92 dSom-1、9.56、8.38 cmolokg-1和42.29%;交换性钙、镁水施药量的增加而身高,绿矾施用量达到2%时,它们分别从对照的7.86 cmolokg-1、0.45 cmolokg-1提高到10.56 cmolokg-1和0.76 cmolokg-1;绿矾的施加也使土壤中各形态铁占全铁比例发生变化,土壤中可还原态铁占全铁比例从对照的4.41%提高到17.22%,利于土壤性质的改善。 因此,绿矾能有效的对苏打碱土进行改良。
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Improvement of saline-sodic soils using by-product of titanium dioxide
Abstract:Several million hectares of saline-sodic soils in the Songnen Plain, northeast China, are difficult to be ameliorated and utilized due to their poor soil properties. Effects of by-product of titanium dioxide (copperas) on soil salinity, pH, exchangeable sodium, exchangeable sodium percentage (ESP) and chemical forms of Fe were studied. The results showed that soil properties. Soil salinity, pH, exchangeable sodium and ESP decreased with the increment of copperas. They decreased from 14.54 dSom-1, 10.58, 15.75 cmolokg-1 and 81.95% in the control to 7.92 dSom-1, 9.56, 8.38 cmolokg-1 and 42.29% with the application rate of copperas is 2.0%, respectively. Soil salinity exchangeable Ca and Mg increased with the increment of copperas. They increased from 7.86 cmolokg-1 and 0.45 cmolokg-1 in the control to 10.56 cmolokg-1 and 0.76 cmolokg-1 with the application rate of copperas is 2.0%, respectively. The application of copperas also changed the proportion of chemical forms of Fe to total Fe in soil. The proportion of reducible Fe, which is beneficial to improvement of soil properties, increased from 4.41% to 17.22%. Therefore, copperas is effective for amending saline sodic soils.
Keywords: soil environment copperas saline-sodic soils reclamation soil properties
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No.4590925965182139****
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