昆明红色石灰土经酸碱处理后的pH值与磁化率的关系研究  

THE RELATIONSHIP BETWEEN pH VALUE AND MAGNETIC SUSCEPTIBILITY OF KUNMING RED LIMESTONE SOIL BY ACID-ALKALI DISPOSED

作　　者：钟望春[1] 苏怀[1] 张丹[1] 

机构地区：[1]云南师范大学旅游与地理科学学院,云南昆明650500

出　　处：《云南地理环境研究》2012年第5期86-91,共6页Yunnan Geographic Environment Research

基　　金：国家自然科学基金(41001010)

摘　　要：土壤磁性变化机制的研究中,越来越多的证据指示成壤作用的影响,而土壤理化性质是其分类的主要因素,却很少有关于土壤理化性质与磁化率关系的研究报道。通过对碳酸盐岩上覆红色石灰土的酸碱处理实验,探究土壤pH值与其磁化率的影响。研究结果表明:酸碱处理前,红色石灰土的磁化率集中在3 000～4 500×10-8m3/kg,pH值在7～8,为碱性土壤;经HCl溶液处理后,pH值下降到1～4,磁化率下降到250～4 000×10-8m3/kg,pH值与磁化率呈现正相关关系;经NaOH溶液处理后,pH值上升到8～13,磁化率反而下降到2 500～4 000×10-8m3/kg,pH值与磁化率呈现负相关关系。上述现象的产生,与酸和强碱所分别带来的还原和氧化环境有关,改变了弱磁性矿物和强磁性矿物之间的转化方向,抑制了趋磁细菌作用,最终引起土壤磁化率的变化。About the research of soil magnetic change mechanism, more and more evidences indicate the impact of pedogenesis. The physical and chemical properties of soil decided soil classification, rarely reported on he relationship between soil properties and magnetic susceptibility. Based on studied the red limestone soil Acid - Alkali disposed, try to analysis the relationship between soil pH and the Magnetic susceptibility. Our result indicate that the magnetic susceptibility of the soils changes from 3 000 -4 500 × 10^ -8m^3/kg before disposing and the pH value of the soil stays from 7 -8, belongs to alkaline soil. After disposing the soil samples with HCl, the magnetic susceptibility changes from 250 -4 000 × 10^-8m^3/kg and the pH value drops tol -4, the pH value and the magmefic susceptibility are positive correlation. After disposing the soil samples with NaOH, the magnetic susceptibility changes form 2 500 - 4 000 × 10^-8m^3/kg and the pH value rises to 8 - 13, the pH value and the magnetic susceptibility are negative correlation. The primary cause of the above phenomenon, Strong acid and alkali were brought to reduction and oxidation environment, changed the transformed direction between the weakly magnetic minerals and strong magnetic minerals, inhibited magnetic bacterial action, ultimately affect the changes of soil magnetic susceptibility.

关 键 词：红色石灰土 PH值 磁化率 

分 类 号：P539.3[天文地球—古生物学与地层学]