【Key words】 Sandy desertification； Soil organic carbon； Active organic carbon； degraded gradient； Soil humus；
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ON the degraded gradient, three different active carbons content of each layer in soil profile was decreased from surface soil to the bottom. The change trends on the profiles under different degraded stages were similar.
3．随着退化程度的加深，土壤剖面中各层土壤三种不同活性有机碳含量均减少，但不同退化梯度下土壤剖面上三种不同活性有机碳含量的变化趋势相似。
参考来源 - 沙质荒漠化过程中土壤有机碳变化特征·2,447,543篇论文数据，部分数据来源于NoteExpress
If the scatter selected in phase gradient algorithm(PGA) algorithm is not isolated, the accuracy of the phase error estimation will be degraded.
当相位梯度算法挑选的散射点不是孤立散射点时，导致相位误差估计的准确性下降。
Distributed shear strain and displacement in localized shear band were investigated considering degraded stiffness in the strain-softening process based on gradient-dependent plasticity.
基于梯度塑性理论，研究了应变软化阶段的刚度劣化对剪切带内部的局部应变及相对剪切位移的影响。
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