| 滨海盐土脱盐过程中pH变化及碱化问题研究 |
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| 引用本文： | 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. |
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| 作者姓名： | 陈巍 陈邦本 沈其荣 |
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| 作者单位： | 南京农业大学资源与环境科学学院，农业部“作物生长调控”重点开放实验室，南京 210095 |
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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＾－、ＳＯ４＾２－、Ｃａ＾２＋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ＳＯ４＾２＋、Ｍｇ＾２＋、Ｋ＾＋特别是Ｃａ＾２＋、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，Ｃａ＾２＋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Ｃａ＾２＋含
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| 关 键 词： | 滨海盐土 pH值 碱化 脱盐过值 土壤离子含量 海涂土壤改良 |
| 收稿时间： | 1999/11/30 0:00:00 |
| 修稿时间： | 1999年11月30 |
STUDIES ON THE CHANGES OF pH VALUE AND ALKALIZATION OF HEAVILY SALINE SOIL IN SEABEACH DURING ITS DESALTING PROCESS |
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| Chen Wei,Chen Bang-ben and 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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| Authors: | Chen Wei Chen Bang-ben and Shen Qi-rong |
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| Institution: | College of Resources and Environmental Sciences and MOA Key Lab of Plant Growth and Regulation, Nanjing Agricultural University, Nanjing 210095;College of Resources and Environmental Sciences and MOA Key Lab of Plant Growth and Regulation, Nanjing Agricultural University, Nanjing 210095;College of Resources and Environmental Sciences and MOA Key Lab of Plant Growth and Regulation, Nanjing Agricultural University, Nanjing 210095 |
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| 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－, SO2－4, Mg2＋, Ca2＋ and K＋ decreased gradually with the decreasing of salt content while that of HCO－3 increased. Furthermore, the relative contents of Cl－ and Na＋ decrease slowly but those of SO2－4, Mg2＋, K＋, especially of Ca2＋ and HCO－3, 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, HCO－3 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 HCO－3. Therefore the desalting process happened in seabeach soil would not cause alkalization. |
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| Keywords: | Saline soil pH Desalting Alklization |
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