| 何文寿,刘阳春,何进宇.宁夏不同类型盐渍化土壤水溶盐含量与其电导率的关系[J].干旱地区农业研究,2010,28(1):111~116 |
| 宁夏不同类型盐渍化土壤水溶盐含量与其电导率的关系 |
| Relationships between soluble salt content and electrical conductivity for different types of salt affected soils in Ningxia |
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| DOI：10.7606/j.issn.1000-7601.2010.01.21 |
| 中文关键词: 盐渍化土壤 含盐量 电导率 盐分组成 |
| 英文关键词:salt-affected soil soluble salt content electrical conductivity salt component |
| 基金项目:宁夏自然科学基金项目(NZ0504) |
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| 中文摘要: |
| 根据宁夏盐渍化土壤的分布区域，采集了不同类型盐渍化土壤样品(0～20 cm)141个，测定了土壤浸提液电导率与水溶性盐含量及其盐分组成，
系统研究了残渣烘干法土壤水溶盐含量与电导率之间的关系。结果如下：(1) 土壤水溶性盐分离子阳离子以钠离子含量最高，镁、钙离子含量次之，阴离子以氯离子含量最高，硫酸根离子含量次之；(2) 从阴离子组成来看，供试土壤以硫酸盐－氯化物型、氯化物－硫酸盐型和硫酸盐型为主，从阳离子组成来看，以镁钙盐型、钙镁盐型和钠盐型为主；(3) 从5种函数模式中筛选出土壤浸提液电导率与其残渣烘干法水溶盐含量之间的最优回归关系，当不区分土壤盐分类型时，可采用二次式（通式）y=0.1609x2+2.9176x-0.0141求解土壤含盐量；当已知土壤盐分类型时，有针对性地选用不同盐分类型最优回归式计算；(4) 提出了电导率法测定土壤水溶盐含量校正为残渣烘干法水溶盐含量的关系式。 |
| 英文摘要: |
| Based on distributing areas of the salt-affected soils in Ningxia, 141 soil samples of surface layer in 0～20 cm with different types of salt-affected soils from various regions of Ningxia were collected, respectively. The electrical conductivities of the soil extracts by using 5∶1 of the ratio of water to soil and the content of soil soluble salts were determined with residue-drying method. The relationship between soluble salt content by residue-drying method and the electrical conductivity in the soil extracts was studied. The results are as follows： (1) The ionic components of the soluble salt for tested soils were proved up. The Na+ content was the highest and Ca2+ and Mg2+ contents were higher in 4 cations. The Cl- content was the highest and SO42- content was quite high in 4 anions. (2) The classifying standard of salt component types for the salt-affected soils in Ningxia Province was perfected. The salt component types for the salt-affected soils were found out. In anion components, the types of sulphate-chloride, chloride-sulphate and sulphate were dominant. In cation components, the types of Mg-Ca, Ca-Mg and
Na were dominant. (3) The regressive equations between the soluble salt content and the electrical conductivity for salt-affected soils of different types in Ningxia were obtained. The optimal regressive equation between soluble salt content by residue-drying method and the electrical conductivity had been screened out from 5 kinds of function patterns. When the soil salt component types were not differentiated, the soil salt content was calculated by using the formula of y=0.1609x2+2.9176x-0.0141. While the soil salt component types have been known, the soil salt content was calculated by using the optimal regressive equations of different salt types. (4) The revised equations of the content of soil soluble salts from an electrical conductivity method to residue-drying method wer
e put forward. The method will supply a scientific basis for testing exactly and rapidly the contents of soil soluble salts. |
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