【Key words】 Sandy desertification； Soil organic carbon； Active organic carbon； degraded gradient； Soil humus；
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草地退化梯度 degradation gradient of pasture
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
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