Fig 1.
Flow chart of the AWD suitability analysis.
Fig 2.
The Philippines and key spatial datasets for Cagayan province.
Panel A: The Philippines, with Cagayan province highlighted. Panel B: Extent of the rice growing area in Cagayan province: Panel C: Soil Mapping Units (SMU) in Cagayan province derived from the Harmonized World Soil Database (HWSD).
Table 1.
Overview of external data sets used in the suitability assessment.
Fig 3.
10 year mean rainfall in mm/dekad.
Top left panel shows the rice extent map as a reference, then sequentially from left to right, top to bottom the remaining 37 panels show the spatial distribution of the 10 year mean daily rainfall per dekad. The border of each rainfall map shows if the dekad is in the dry season (red), wet season (blue) or off-season (gray).
Table 2.
Soil types and their share within each soil mapping unit in Cagayan province.
Fig 4.
Schematic display of the water balance in flooded rice fields without irrigation (redrawn with modifications after [32]).
Blue (thick) arrows in the figure are the only water fluxes considered in the water balance calculations. Black arrows show other water flows that are not considered.
Table 3.
Overview of derived data sets used in the suitability assessment.
Fig 5.
10 year mean Pot_ET in mm/dekad.
Top left panel shows the rice extent map as a reference, then sequentially from left to right, top to bottom the remaining 37 panels show the spatial distribution of the 10 year mean Pot_ET per dekad. The border of each Pot_ET map shows if the dekad is in the dry season (red, wet season (blue) or off-season (gray).
Table 4.
Potential percolation rates as a function of soil texture.
Table 5.
Breakpoints on the DEF score index for the sensitivity analysis on low (LS), moderate (MS) and high (HS) suitability for AWD.
Fig 6.
Dekad wise scoring maps in the wet season.
Fig 7.
Suitability map for AWD in the wet season.
Map shows the pixels identified as suitable for AWD in the wet season based on soil specific percolation rates (using the basic settings column in Table 4) and for suitability class breakpoints (using the basic settings row in Table 5).
Fig 8.
Sensitivity analysis on Pot_Pc for AWD in the wet season.
Area of wet season rice (in hectares) deemed climatically suitable for AWD, by suitability class. The basic setting breakpoints were used for the suitability classes and each bar in the chart represents the suitable area for different Pot_Pc setting in the soil specific Pot_Pc rates (top panel) and fixed Pot_Pc rates (bottom panel).