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为了探明红壤的灼烧磁性增强特征，测定了五种红壤在不同温度下灼烧后样品的磁化率，依频磁化率，软剩磁，硬剩磁，饱和等温剩磁和非滞后剩磁．结果表明：红壤灼烧至３５０℃开始产生磁性增强，在６５０～７５０℃和９５０℃出现磁化率峰值．五种供试土壤的磁性增强强度在３．４９～４２．７５之间．红壤灼烧磁性增强主要由于非铁磁性的无定形氧化铁转化为铁磁性的氧化铁所致．大约在３５０～６５０℃灼烧产生“软”多畴和超顺磁的磁铁矿／磁赤铁矿．所生成的“软”多畴和超顺磁磁铁矿／磁赤铁矿颗粒在相对较高的温度下转变为ＦＶ颗粒，在７５０℃以上转化为不完全反铁磁质的赤铁矿
In order to investigate the magnetic enhancement characteristics of red soil, the magnetic susceptibility, frequency dependent susceptibility, soft remanence, hard remanence, saturated isothermal remanence and non-hysteresis remanence . The results show that the magnetic field increases with the red soil burning to 350 ℃, and the magnetic susceptibility peak appears at 650-750 ℃ and 950 ℃. The magnetic intensities of the five soils tested ranged from 3.49 to 42.75. The enhanced magnetic ignition of red soils is mainly due to the conversion of nonferromagnetic amorphous iron oxide to ferromagnetic iron oxide. Burning at about 350-650C results in “soft” multi-domain and superparamagnetic magnetite / maghemite. The resulting “soft” multidomain and superparamagnetic magnetite / maghemite particles are converted to FV particles at relatively high temperatures and converted to hematite with incomplete antiferromagnetism above 750 ° C