As shown in Figures 2b , f , SOC and AK generally showed a trend of increasing first and then decreasing, with levels ranging from 1.04 to 2.08 g/kg and 62.95 to 91.62 mg/kg, respectively.
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Metabolic limitations of soil microorganisms during the decay of <i>Salix psammophila</i> sand barriers.
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The sentences
The results showed that (1) soil C:N showed an increasing trend, but soil N:P showed a decreasing trend over time.