However, as elevation increased, TCS did not present a clear trend, which countered the findings of Seedre et al . 21 .
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Effects of stand age on carbon storage in dragon spruce forest ecosystems in the upper reaches of the Bailongjiang River basin, China.
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Other carbon pools did not change significantly with increasing stand age ( P > 0.05), although they presented a decreasing trend.
The present study showed a trend of increasing soil pH and ρ with the soil depth in each age group (Fig. 3 ), but SOC exhibited the opposite trend, as low soil pH and ρ are more favorable to an accumulation of SOC 27 .