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Figure S1. Average diameter at breast height (DBH, 1.3 m) in March 2012 after different nitrogen treatments.

Figure S2. Microclimates (A: atmospheric temperature; B: atmospheric humidity) of the plantation under different nitrogen treatments. Atmospheric temperature and humidity were determined by TES Humidity/Temperature Meter (TES-1361, Electrical Electronic Corp).

Table S1. The mean values of soil ions in 0–20 cm and 20–40 cm layers after 8 years of nitrogen treatments. Statistical analysis only found that the Mn element showed significant changes among nitrogen treatments as indicated by different labels.

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