N disturbances can make B. utilis soil urease, catalase, invertase enzymes activities improve in various degrees, C disturbances did not influence on the catalase enzyme activity obviously;

• 施N干扰可使糙皮桦林地土壤脲酶、过氧化氢酶和蔗糖酶活性较对照有不同程度的提高，而施C对土壤过氧化氢酶活性影响不明显；