Figure 4.

Temporal and spatial distributions of exchangeable Ca, Mg, and K in the soil of bayberry orchards. The contents of exchangeable Cations (abscissa axis) in different soil depth (axis of ordinates) from sample soil of the different tree ages of T10 for 10 years old, T20 for 20 years old, and T30 for 30 years old were showed for exchangeable K in (a), for exchangeable Ca in (b), and for exchangeable Mg in (c). Different letters between different bayberry tree ages represent significant differences (p < 0.05).