影响土壤浸提液电导率的盐分化学性质要素及其强度研究

CHEMICAL FACTORS TO ELECTRICAL CONDUCTIVITY OF SOIL EXTRACT AND THEIR INTENSITY

为评估土壤盐分化学性质对土壤溶液电导率的影响强度,应用通径分析方法研究了滨海盐土的1∶5土水比土壤浸提液电导率(EC1∶5)与土壤盐分化学性质各要素的关系。研究结果表明:土壤浸提液盐分浓度(SSC)、Cl-和钠吸附比(SAR)是影响土壤浸提液电导率的最重要因素,而pH、CO2 -3 、HCO-3 、可溶性钠百分率(SSP)和钠钙镁比(SDR)对土壤浸提液电导率的影响很微弱;SO2 -4、Ca2 + 、Mg2 + 、K+ 和Na+ 对土壤浸提液电导率的直接通径系数并不高,但由于被其他各化学性质要素的间接效应所增强,使得其对溶液电导率的间接通径系数之和较大。验证结果表明:EC1∶5与土壤浸提液盐分浓度(SSC)、Cl-和SAR的多元线性函数具有较高精度和良好可靠性,在土壤盐分过高的情况下。

In order to assess effects of chemical properties of soil salinity on electrical conductivity of 1∶5 soil water extract (EC 1∶5 ), the relations between EC 1∶5 and chemical properties of soil salinity were studied through Path Coefficient analysis. The results obtained show that total soluble salt concentration (SSC), Cl -, and sodium adsorption ratio (SAR) were the most primary factors to EC 1∶5 of coastal salt affected soils, while pH, content of CO 2- 3 or HCO - 3, soluble sodium percentage (SSP) and sodium dianion ratio(SDR) affected EC 1∶5 very faintly. Though direct path coefficients between content of SO 2- 4, Ca 2+ , Mg 2+ , K + or Na + and EC 1∶5 were not high, they were enlarged by influence of other chemical factors, making the summation of indirect path coefficients between EC 1∶5 and these factors relatively higher. Verification showed that the multifactor regression function between EC 1∶5 and most of the primary factors had sound reliability and very good accuracy, while errors in deducing electrical conductivities based on the function would somewhat be greater when soil salinity was excessively high.