Topographical Position
It was found that paddy fields located at higher topographical positions (middle terraces, high terraces, and
hills) in the landscape have a higher mean density of trees
(14 and 17.3 trees/ha, respectively) than those located at
lower positions (flood plain and low terraces) (9.4 trees/ha)
(Table 4). The differences are highly significant
(|p| B 0.01). This result supports the hypothesis and is in
keeping with the findings of previous studies (Grandstaff
et al. 1986; Vityakon 1993, 2001; Prachaiyo 2000)