Abstract
The magnetization rate to the paddy soils and their neighboring upland soils distributed in the northeast of China was measured by the WCL-1 type magnetization rate measure meter, and the correlation between the magnetization rate and the physico-chemical properties of these soils was studied. Its significance to soil formation process of paddy soils in the northeast of China was also discussed in this paper. The results showed that magnetic rate of polowed layer of paddy soils was evidently lower than that of the neighboring upland soils. The higher the magnetic rate of the original soils, the more the magnetic rate decrease after rice cultivation. And for those derived from the same original soils, the longer the period of rice cultivation, the bigger the magnetic rate drops. Moreover, magnetic rate of paddy soil was correlated negatively with the content of clay (<0.002 mm) but positively with the content of organic matter, the free humic acid fHa, PQ_1 value and organic complex Fe level.
