滨海盐土的主要特征是全盐含量高，也是作物生长的障碍因子。电导率的测定是测定土壤中水可溶性盐快速而简单的方法。国内标准方法是在25℃温度下用土水比为1:5的澄清悬液测定，但计算方法不统一。为了研究滨海盐土中可溶性全盐(Y)与电导率(X)之间本质上关系，比较了10种曲线回归方程。结果表明：在砂涂中全盐与电导率之间最佳曲线回归方程为线性方程：Y=0.045+2.935X(R2=1.000)，而其幂函数曲线方程R2=0.998。在黏涂中全盐与电导率之间最佳曲线回归方程为三次曲线方程：Y=0.194+0.3096X-0.253X2+0.046X3(R2=1.000)，但其幂函数曲线方程的R2也为0.998。

The high amount of total salts is an important characteristic of the coastal saline soils, an impeding factor to the growth crops too. Electrical conductivity (EC) measurements are quick, simple determinations for water-soluble salts in soils. The standard EC method used a soil to water ratio of 1:5 and was measured in the supernatant at 25℃ . But the calculate method differed radically. In order to investigate the essential relationships between the total soil soluble salts (Y) and the soil electrical conductivity (X) in the coastal saline soil, this paper compared 10 types of curve regression equation. The results showed the best curve equation between the total soil soluble salts (Y) and the soil electrical conductivity (X) was linear equation in the coastal sandy saline soil: Y=0.045 2.935X(R2=1.000). But the R2 of the power curve equation was 0.998. The best curve equation between the total soil soluble salts (Y) and the soil electrical conductivity (Y) was the cubic curve equation in the coastal clayey saline soil: Y=0.194 3.096X-0.253X2 0.046X3 (R2=1.000). But the R2 of the power curve equation was 0.998.