昆明西山山原红壤和红色石灰土的pH值与磁化率关系研究

通过对昆明西山山原红壤和红色石灰土的pH值和磁化率测试研究发现,山原红壤的pH值在4.0~5.8之间,呈酸性,质量磁化率在56×10-8~174×10-8m3/kg之间,pH值与磁化率呈明显的正相关关系;而红色石灰土pH值在6.0~8.4之间,磁化率为752×10-8~5 056×10-8m3/kg,pH值和磁化率呈负相关关系。该研究表明,在我国西南地区,土壤pH值和磁化率既存在明显的负相关关系也存在正相关关系。结合前人在其他地区的研究资料,进一步发现,土壤的酸碱环境可能是决定这些关系的重要因素。

The Relationship Between pH Value and Magnetic Susceptibility of Soil——A Case Study of Mountain Red Soil and Red Limestone Soil

Based on the measurements of pH value and magnetic susceptibility of soil samples obtained from mountain red soil and red limestone soil in Kunming Western Hills. The results showed that mountain pH value of red soil mainly ranged within 4.0-5.8 while magnetic susceptibility within (56-174)×10-8 m3/kg, showed a positive correlation; but pH value of limestone ranged within 6.0-8.4 while magnetic susceptibility within (752-5 056)×10-8 m3/kg, showed a negative correlation, thus the relationship between soil pH value and magnetic susceptibility may be positive or negative in southwest China. Combined with the related results in previous studies, we farther found that the above phenomena maybe mainly affected by the acid or alkaline soil environment.