| 迟春明,王志春.松嫩平原苏打盐渍土钠吸附比的间接推算[J].干旱地区农业研究,2013,31(6):198~202 |
| 松嫩平原苏打盐渍土钠吸附比的间接推算 |
| Estimating sodium adsorption ratio(SAR) of saline sodic soils in songnen plain, northeast China |
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| DOI：10.7606/j.issn.1000-7601.2013.06.034 |
| 中文关键词: 盐渍土 钠吸附比 电导率 钠离子浓度 二价阳离子浓度 阳离子总浓度 阴离子总浓度 |
| 英文关键词:saline soil sodium adsorption ration electrical conductivity sodium concentration bivalent cation concentration total cation concentration total anion concentrations |
| 基金项目:国家自然科学基金项目(41161037)；公益性行业(农业)科研专项经费项目(200903001-06) |
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| 中文摘要: |
| 土壤钠吸附比(SAR)的推算需要获得实测Na+浓度和推算Ca2++Mg2+(二价阳离子)浓度，或者实测二价阳离子浓度和Na+浓度。本文应用两批土样数据，采用实测Na+浓度与电导率(EC)推导阳离子总浓度(TCC)计算二价阳离子浓度(方法一)、实测二价阳离子浓度与推算TCC计算Na+浓度(方法二)、实测Na+浓度与实测阴离子总浓度(TAC)推算二价阳离子浓度(方法三)、实测二价阳离子浓度与TAC计算Na+浓度(方法四)四种方法推算SAR。成对样本T检验结果表明，四种方法获得的SAR推算值与实测值间无显著性差异(Ｐ>0.05)。但是，第一和第三种方法推算SAR和实测值间回归方程斜率分别为0.66和0.79；而第二和第四种方法SAR推算和实测值回归方程斜率分别为0.96和1.10，非常接近1.0。这表明，实测Na+浓度和推算二价阳离子浓度方法推算的SAR准确性较差，采用实测二价阳离子和推算Na+浓度方法推算的SAR值准确性较高。因此，在实际工作中建议使用实测二价阳离子浓度的方法(方法二和方法四)推算SAR。 |
| 英文摘要: |
| The Sodium adsorption ration (SAR) of soil can be calculated from measured Na+ concentration and predicted Ca2++Mg2+ (bivalent cation) concentration or from measured bivalent cation concentration and predicted Na++ concentration. In this study, four methods were used to estimate SAR of saline sodic soils in Songnen Plain, Northeast China by using two set of soil samples. First method, the bivalent cation concentration was calculated by the total cation concentrations (TCC) that was derived from the measured Na+ concentration and electrical conductivity (EC); second method, the Na+ concentration was calculated from the predicted TCC and measured bivalent cation concentration; third method, the bivalent cation concentration was calculated from the measured Na+ concentration and total anions concentrations (TAC); fourth method, the Na+ concentration was calculated from the measured bivalent cation concentration and TAC. The Results by T test for a paired samples were showed that: There was no significant difference between the calculated SAR and measured SAR (Ｐ>0.05). However, the slope of the regression between measured SAR and predicted SAR calculated from the first and third method was 0.66 and 0.79, respectively. This shown these methods by measured Na+ concentration and predicted bivalent cation concentration to estimate SAR with a poor accuracy. For the second and fourth method, the slop of the regression between measured SAR and predicted SAR was 0.96 and 1.10, respectively, which was very close to 1.0 with a high accuracy. So in practical use, suggested that methods by measured bivalent cation concentration and predicted Na+ concentrations to estimate SAR. |
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