电导法测定黄土-古土壤序列易溶盐含量的方法学研究

doi:10.7523/j.issn.2095-6134.2014.06.010

摘要/Abstract

摘要：

尝试使用电导法测定黄土-古土壤序列中的易溶盐总量.着重考察配制溶液时的水土比例、溶解时间等具体实验条件对测试结果的影响.当水土比固定时,若溶解时间增加,电导率也随之增加;溶解时间固定时,随着水土比的增加,电导率则逐渐降低.水土比变化对电导率测量值的影响较震荡时间更高,是最重要、需要最先确定的实验条件.为了尽可能保证易溶盐溶解、避免难溶盐参与溶解,建议测定黄土-古土壤序列电导率时,使用5:1的水土比;选择至少10 min的震荡时间,30 min为最优.若样品年代较早,或地理位置偏东南,则建议更长的震荡时间.

关键词: 黄土-古土壤, 电导率, 易溶盐, 水土比

Abstract:

Electrical conductivity method is a simple and rapid way to determine soil salinity, and it has been widely applied to modern soil, but limitedly applied to loess-paleosol sequence. In this paper, samples from Luochuan and Zhouyuan loess sections have been analyzed to measure the salinity by using electrical conductivity method. We focus on the impact of water-soil ratio and oscillation time on the determination, and the optimum conditions for conductivity determination of salinity in loess-paleosol sequence are identified on the basis of numerous experiments.

Key words: loess-paleosol, electrical conductivity, soluble salts, water-soil ratio

中图分类号:

P532

潘国勇, 李玉梅, 罗明奇, 王利贤. 电导法测定黄土-古土壤序列易溶盐含量的方法学研究[J]. 中国科学院大学学报, 2014, 31(6): 791-798.

PAN Guoyong, LI Yumei, LUO Mingqi, WANG Lixian. Study on determination of soluble salts by electrical conductivity method in loess-paleosol sequence[J]. , 2014, 31(6): 791-798.

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