磁性参数在红壤退化评价指标中的应用

选择浙西金华地区兰溪实验观测站六种不同退化程度的红壤为研究对象 ,分析了反映红壤退化程度的物理、化学和生物指标及红壤磁测参数与它们之间的内在联系。结果表明 ,磁性参数与反映红壤退化程度的理化及生物指标均有显著或较显著的相关性。退化程度较轻的香樟林和混交林表现了较低的细晶粒磁性矿物含量和较高的反铁磁性矿物含量 ,退化程度较高的杉木林、桔园、草地则相反 ,细晶粒磁性矿物含量较高且亚铁磁性矿物的相对含量上升。磁性参数和土壤理化生物指标之间良好的相关性表明 ,磁性参数可以作为指示红壤退化程度的重要指标。

Application of Magnetic Coefficients to the Evaluation Index System for Red Soil Degradation

Soil physical, chemical and biological characters which represent six red soil deteriorating degrees were studied and relationship between soil magnetic coefficients and the soil properties was analysed in Lanxi observation station in the western Zhengjiang. Results showed that, soil magnetic coefficients such as χ,SIRM?χ fd ,ARM,SIRM/χ have significant correlation with soil physical, chemical and biologic characters. Soils which have lower degradation degrees showed a lower concentration of finer grade magnetic minerals and a higher concentration of imperfect anti-ferromagnetic minerals, while the soils which have higher degradation detrees showed relative enrichment of finer grade magnetic minerals and ferrimagnetic minerals. It indicated that soil magnetic coefficients could be used as an important indicator for soil degradation.