This paper focuses on the characteristics of soil humus components and their changing tendency influenced by biological soil crusts in the rehabilitated grassland of the hilly loess region. The results showed that: 1) There was clear hierarchical characteristics of the distributions of humic acid, fulvic acid and humin content of the soil humus components influenced by biological soil crusts, all in the order of the crust layer>0 ~ 2 cm layer>2 ~ 5 cm layer. Humus contents of different years showed an...
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