滨海盐土脱盐过程中pH变化及碱化问题研究
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STUDIES ON THE CHANGES OF pH VALUE AND ALKALIZATION OF HEAVILY SALINE SOIL IN SEABEACH DURING ITS DESALTING PROCESS
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    摘要:

    对滨海重盐土室内淋洗模拟脱盐过程的分析研究结果表明:随着含盐量的下降,Na+、Cl-、SO42-、Mg2+、Ca2+和K+的绝对含量都逐渐减少,HCO3-逐渐增加;Cl-和Na+的相对含量逐渐下降,而SO42-、Mg2+、K+特别是Ca2+、HCO3-;的相对含量逐渐增加,当含盐量降至1g/kg以下时结果更加明显.由于各离子的迁移能力不同,导致土壤的盐分化学类型由Cl-Na向HCO3-Ca转化.淋洗试验中淋洗液的盐分化学类型变化滞后于土样.pH值在整个脱盐过程中先上升后下降,pH值下降时的土壤含盐量在小于1g/kg范围.在pH值先上升后下降的变化过程中,Ca2+含量是先下降后上升,而HCO3-;含量是先上升后下降,残余碳酸钠(RSC)的变化趋势也与HCO3-一样,土壤pH值与可溶性Ca2+含量呈互为增减的关系.钠吸附比(SAR)和土壤碱化度(ESP)在整个脱盐过程中始终下降.pH值上升的真正原因是由于脱盐导致Ca2+淋失,相应提高了HCO3-含量所致,而非交换性Na+水解的结果.滨海盐土脱盐同时脱碱,不会发生碱化现象.淋洗试验盐渍性状变化过程基本反映了实际条件下滨海盐土脱盐过程盐渍性状的变化规律.

    Abstract:

    The experiments on indoor imitating process of soil column leaching for desalting were conducted on heavily saline soil in seabeach. The results showed that the absolute amounts of Na+、Cl-、SO42-、Mg2+、Ca2+ and K+ decreased gradually with the decreasing of salt content while that of HCO3- increased. Furthermore, the relative contents of Cl- and Na+ decrease slowly but those of SO42-,Mg2+,K+,especially of Cat+and HCO3-,increased significantly. Due to the different transfer rates of ions, the soil chemical type took a shift from Cl-Na to HCO3-Ca. The changes of salt chemical type in leaching solution happened more slowly than in the column soil. During the whole leaching process in the experiments, the pH value, HCO3- content and RSC went up, then went down with the shifting point of soil salt content being <1g/kg, it is quite the contrary for Ca2+ content in soil. Both the SAR and ESP decreased all the time and ESP almost reached zero. The real reason for pH increase during the process of desalting was not the hydralization of nonexchangeable Na+ but the leaching loss of Ca2+ and a small increase of HCO3-.Therefore the desalting process happened in seabeach soil would not cause alkalization.

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陈巍,陈邦本,沈其荣.滨海盐土脱盐过程中pH变化及碱化问题研究[J].土壤学报,2000,37(4):521-528. DOI:10.11766/trxb199911300412 Chen Wei, Chen Bang-ben, Shen Qi-rong. STUDIES ON THE CHANGES OF pH VALUE AND ALKALIZATION OF HEAVILY SALINE SOIL IN SEABEACH DURING ITS DESALTING PROCESS[J]. Acta Pedologica Sinica,2000,37(4):521-528.

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  • 收稿日期:1999-11-30
  • 最后修改日期:2000-01-07
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  • 在线发布日期: 2013-02-25
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