3.2.1 Soil pH
The pH of the soils was relatively uniform (Figure 5), with the
following mean pH in KCl values: Anak Krakatau (4.62), Sebesi (4.96),
Rakata (5.60), and Pulau Panjang (5.63). The ΔpH (pH H2O
– pH KCl) values were positive (mean of 1.1 unit). The continual
eruption of Anak Krakatau had a profound effect on soil pH
(H2O), resulting soils of Anak Krakatau have the lowest
pH value. The variation within an island is noticeable with a general
trend that soils in the lower elevation had a higher pH than those at a
higher elevation.