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Effects of simulated nitrogen (N) deposition on soil net nitrogen mineralization (NNM) were examined  in situ  during two growing seasons, using the resin-core technique in the semiarid meadow steppe in Inner Mongolia, China. The aim of this study is to clarify the effect of N levels (0, 10, and 20 kg N ha −1 yr −1 ) and forms (NH 4   +  and NO 3   - ) on soil mineral N and NNM. Our results showed that N levels had no significant differences on soil mineral N and NNM. In the first year, three N treatments ((NH 4 ) 2 SO 4 , NH 4 Cl and KNO 3 ) increased soil NH 4   +  concentrations but had no significant effects on soil NO 3   -  concentrations. In the second year, (NH 4 ) 2 SO 4  treatment increased soil NO 3   -  concentrations, NH 4 Cl and KNO 3  treatments decreased them. Three N treatments significantly decreased soil NH 4   +  concentrations in the later stages of the second year. As for the soil NNM, three N treatments had no significant effects on the rates of soil NNM ( R   m ) and net nitrification ( R   n ) in the first year, but significantly decreased them in the second year. The contribution of N addition to  R m   was higher from (NH 4 ) 2 SO 4  than from NH 4 Cl and KNO 3 . However, Soil  R   m  was mainly affected by soil water content (SWC), accumulated temperature (T a ), and soil total N (TN). These results suggest that the short-term atmospheric N deposition may inhibit soil NNM in the meadow steppe of Inner Mongolia.

Effects of Simulated Nitrogen Deposition on Soil Net Nitrogen Mineralization in the Meadow Steppe of Inner Mongolia, China