Hypothesis 3 Paddy fields in areas with nearby forests
have higher densities than fields in areas without easy
access to forests.
In order to examine if the density of trees in paddy fields
is related to the availability of natural forest resources, GIS
data of land use and forest cover in 2000 were obtained on
1 August, 2011 from an online website (http://www.rsgis.
ait.ac.th/-souris/thailand.htm#THAIDEM300). The map,