Final Technical Report - weADAPT

5.2.3 Conclusion
The change in tributary’s run-off is not in proportion of to the change in
precipitation. Increasing in tributary’s discharge is higher than the increasing of
precipitation in the catchments. The increased discharge is excess water as the current
water condition is sufficient to maintain the ecosystem of the watershed, e.g.
evapotransporation of plant in the watershed, soil moisture, etc.
5.3 Study of impact of climate change on rain-fed rice productivity in lower Mekong
River region
Change in climate pattern will affect agriculture system directly, especially the
rain-fed system. This study focused the study of climate change impact on rain-fed rice
cultivation as it is considered as the most important food crop of the Southeast Asia
region with focus on 3 selected study sites in Lao PDR, Thailand and Viet Nam.
Figure 24: Selected study sites on impact of climate change on rain-fed rice
productivity
5.3.1 Description of Scientific Methods and Data
This study analyzed the impact of climate change by using crop model to simulate
potential future yield of rice productivity in the region under different climate scenarios.
The crop model used is Decision Support System for Agro Technology Transfers
(DSSAT version 4.0) crop modeling software (Hoogenboom et al, 1998) with daily
Final technical report – AIACC AS07 50