A two‐way ANOVA test demonstrated extremely significant relationships between soil depth and vegetation type on enzyme activity (amylase, urease, sucrase) in all samples studied (Table 3 ). 3.4 Relationships among the SOC fractions, enzyme activities, physical and chemical characteristics A correlation analysis (Table 4 ) demonstrated that the MBC content displayed an extremely significant positive correlation with catalase.
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Changes in soil carbon fractions and enzyme activities under different vegetation types of the northern Loess Plateau.
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