The spatial distribution of density of trees in paddy fields in
all the sample grid cells in Northeast Thailand is shown in
Fig. 4. It is evident that there are large variations in tree densities among different areas within the region. Figure 5 is a
map showing the zones with different mean densities of trees in
paddy fields in the region. It can be seen that the southeastern
part of the region tends to have higher densities of trees, while
the northern central part has much lower densities. In particular, most of the area in Amnat Charoen and Ubon Ratchathani
provinces belongs to the very high density zone (more than
17.1 trees/h) whereas most of the area in Khon Kaen province
belongs to the very low density zone (9.0 trees/ha)