3.0- 
cf 1-5 
Q_ 
0.0 
3.0 
o 
Dl 1.5 
0.0 
a) 
PO=-16.2+ 0.0087* Year 
4 
p = 0.01 • 
• t = 0.13 
* 4 
1M 
b) 
i ; iy !> 
I960 
1970 
1980 1990 
Year 
3- 
2000 
Figure 6.3 Comparison of historic and recent PO 4 during the dry season in a) Zone 1 and b) Zone 2. 
The line in the upper panel shows a significant increasing trend in Zone 1 (Mann Kendall, p = 
0 . 01 ). 
The line in the upper panel shows a significant decreasing trend in Zone 1 (Mann Kendall, p< 
0 . 01 ). 
1 ^ 
47 
