土壤阳离子代换量低是云杉死亡的一个因素；
However, the low cation exchange capability is one of the reasons to result in spruce death.
实验结果表明：非磁性离子代换量的变化引起材料磁特性的规律性变化。
The experimental results show that the quantitative changes of nonmagnetic ion substitution cause the regular changes of magnetic properties.
根据非磁性离子代换量和磁晶各向异性的关系，对实验结果作了合理的解释。
According to the relation between nonmagnetic ion substitution quantity and magnetocrystalline anisotropy, a reasonable interpretation for the experimental was obtained.
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