Mechanisms for the retention of inorganic N in acidic forest soils of southern China.

NH 4 + immobilization ranged from 0 to 3.74 mg N kg −1 d −1 (with an average of 1.8 mg N kg −1 d −1 ) in southern soils and from 0 to 2.58 mg N kg −1 d −1 (with an average of 0.59 mg N kg −1 d −1 ) in northern soils, but the difference was only marginally significant (p = 0.053).

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