Straw mulching and nitrogen application altered ammonia oxidizers communities and improved soil quality in the alkaline purple soil of southwest China.

In addition, the correlation analysis confirmed that pH was negatively significantly correlated with TN, AN, and NH 4 + -N ( P < 0.05), and there were significant or extremely significant positive relationships among SOC, TN, AN, NH 4 + -N, and AP ( P < 0.01, 0.05; Fig. 3 ).

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