松嫩平原盐碱土饱和浸提液与土水比1：5浸提液间化学参数的换算关系

Conversion relationships between the chemical parameters in saturated and in 1:5 soil/water extracts of saline and alkaline soils in Songnen Plain of Northeast China

采用饱和浸提液与土水比1:5浸提液两种方法分析了松嫩平原94份盐碱土样品的电导率、钠吸附比、主要阳离子(Na+、K+、Ca2+、Mg2+)以及总阳离子浓度等化学参数,并对两种方法测定的盐碱化参数相关性进行了研究。结果表明:饱和浸提液电导率、钠吸附比、总阳离子浓度、Na+离子浓度与土水比1:5浸提液相应参数存在极显著的相关关系,其关系方程可用于松嫩平原盐碱土饱和浸提液与1:5浸提液间化学参数的换算;而K+、Ca2+、Mg2+离子浓度在两种浸提液间不存在相关性。

Ninety-four saline and alkaline soil samples were collected from the Songnen Plain of Northeast China, and their electrical conductivity （EC）, sodium adsorption ratio （SAR）, total cation concentration （TCC）, and major cations （ Na^＋, Ca^2＋, Mg^2＋, K^＋ ） concentrations in saturated and in 1 ： 5 soil/water extracts were determined. The EC, SAR, TCC, and Na^＋ concentration in saturated and in 1 ： 5 soil/water extracts had significant correlations, and the established regression equations could be used to convert these parameters in the two extracts. However, no correlations were observed between the K^＋, Ca^2＋ and Mg^2＋ concentrations in saturated and in 1 ： 5 soil/water extracts.