a positive trendp = 0.056
The Organic Matter Decomposition module was significantly correlated with AP (r = 0.457, p = 0.046), pH (r = 0.492, p = 0.021), and Fe (r = 0.521, p = 0.007), and also showed a positive trend with NO 3 − -N (r = 0.691, p = 0.056).