《Table 2 Effects (P and F values) of long-term (12 years) N fertilization on soil p H, SOC content a

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《"Hierarchical responses of soil organic and inorganic carbon dynamics to soil acidification in a dryland agroecosystem,China"》

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At each soil depth，there were no significant difference in soil p H and soil carbon contents among different N fertilizer application levels（Fig.1）and N fertilization exhibited no significant effect on both soil p H and soil carbon contents（Table 2），after a long-term（12 years）N fertilization in the experimental field.However，there was a marginally significant effect of N fertilization on soil p H in relation to soil depths after the long-term N fertilization（P=0.058；Table 3）.The soil p H value decreased in all three N fertilizer treatments after the long-term N fertilization in the experimental field（Table 3）.Although the N fertilization did change the soil carbon stock at the0–200 cm soil depth，the recommended N fertilizer application rate（i.e.，N120）had the highest SOC stock.Meanwhile，the projected N fertilizer application rate（i.e.，N240）had the lowest SIC stock.