The dry weight
of the annual litterfall on the upper part of the study slope
(plots R and U, see later) was 5.91Mgha1 in 1997,
5.88Mgha1 in 1998, and 3.75Mgha1 in 1999, and
leaf litter accounted for 55% of the total litterfall on
average (Marod, unpublished data, 2000). The soil at the
study sites was classified as Alfisols (Soil Survey Staff
2006) derived from sedimentary rock, gneiss, and limestone
(Suksawang 1995).