Figure 2
From: Nitrogen and potassium limit fine root growth in a humid Afrotropical forest
Nutrient addition effect on fine root biomass (mean ± SE, n = 16 plots), measured from six randomly located soil monoliths (20 cm × 20 cm × 10 cm) per plot after the first year (2019) and second year (2020) of the full factorial N-P-K experiment in the Budongo Forest Reserve, Uganda. Fine root biomass responses in (a) − N (Control, P, K, PK) compared to + N (N, NP, NK, NPK) treatments, (b) − P (Control, N, K, NK) compared to + P (P, NP, PK, NPK) treatments, and (c) − K (Control, N, P, NP) compared to + K (K, NK, PK, NPK) treatments. Fine root biomass decreased with N addition (F1,24 = 20.21; P = 0.0001; panel a).
