Simulated increased N deposition impacts on forest productivity as stand development.

<p>(Panel A) The magenta solid line stands for the stem wood biomass production in tone dry matter per hector (t DM ha⁻¹), and green solid line refers to the net primary production in tone dry matter per hector (NPP, t DM ha⁻¹ year⁻¹). (Panel B) Annual increment of ANR (red solid line, ANR, kg N ha⁻¹ year⁻¹). (Panel C) The blue solid line represents current status of soil available N for growth in kg N per hector (kg N ha⁻¹), olive solid line refers to soil organic C (SOC, t C ha⁻¹) of <i>C. lanceolata</i> plantation in southern China from seedling to 120 years of age. In panels A, B, and C, a0, b0 and c0 represent growth trends from the basic, under initial level of N deposition (N4.9) and without rotation practice (RL120), simulation that made up the baseline data set; and a1–5, b1–5, as well as c1–5 represent predicted growth response trends generated under increased N deposition. The dashed lines represent growth constraint equilibrium state.