marginally significantP < 0.10
In contrast, several variables showed marginally significant trends (0.05 < P < 0.10): soil pH ( P = 0.071; Figure 3b ), non-photochemical quenching ( P = 0.082; Figure 3e ), legume abundance ( P = 0.077; Figure 3i ), and species richness ( P = 0.082; Figure 3m ) all exhibited slight non-linear trajectories.