Figure 1:
Schematic representation of the randomized block factorial experiments along an elevational gradient on Yulong Mountain (a). Two factors of experimental warming and nitrogen addition and two levels for each factor (b). For experimental warming, two OTCs were used to raise the air temperature by 1.0–2.0 °C consistently along the elevational gradient. For nitrogen addition, half of the area of each block was fertilized using urea fertilizer at the beginning of the rainy season at a rate of 5 g/m2/year.
