A comparison of the two west–east transects across the survey area in 1995

A comparison of the two west–east transects across the survey area in 1995, showing changes from east to west in (a) total Al (nitric acid) and exchangeable Al concentrations in the O-horizon; (b) total Al concentrations in moss and Al (aqua regia extracts) concentrations in the C-horizon; and (c) the exchangeable Al:(Ca+Mg+K+Na) ratio in the O-horizon