However, some investigations also reported a positive trend of SOC stock with increasing soil depth 40 ; a finding which we attribute to an unusual trend due to mixing effects of tillage 40 .
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Spatial distribution of soil organic carbon stock in Moso bamboo forests in subtropical China.
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The sentences
Results show that SOC stock showed a decreasing trend with increasing soil depth; for 0–20 cm, SOC stock fell within 20.7–90.0 Mg ha −1 , and it was 10.5–72.2 Mg ha −1 for 20–40 cm, 6.6–80.1 Mg ha −1 for 40–60 cm and 52.8–229.7 Mg ha −1 for 0–60 cm.