According to ( Figure 7b ), the C/N ratios between the soil layers exhibit a highly significant positive correlation (*), with correlation coefficients (greater than 0.8) that are higher than those on sunny slopes.
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Effects of restoration duration on plant community and soil chemical stoichiometry characteristics in mine waste dumps.
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Each plot exhibited a continuous increase in species number over time, leading to a more diversified species composition, while the artificially established vegetation showed a trend of degradation. 3.2.
The difference of N/P ratio in the vertical direction was small, but the 6Y and 10Y plots showed a decreasing trend with the deepening of soil layer.
When C/N > 25, the organic matter accumulation rate exceeds the decomposition rate ( Bui and Henderson, 2013 ), and the soil carbon pool shows an increasing trend.