Dr. Suria Tarigan is associate professor at Department of Soil and Land Resources Faculty of Agriculture Bogor Agricultural University (IPB), Indonesia.
His research interests are hydrological functions, land use change and water flow regulation ecosystem services. Currently, he serves also as Head of Watershed Management Study Program of Bogor Agricultural University (IPB).

Assessing relative impact of change in soil infiltration and plant transpiration on the catchment water yield component and water scarcity in the Tropical Lowland Rainforest Transformation Systems (Sumatra, Indonesia)

We measured soil infiltration across different land use types including forest, rubber and monoculture oil pam. We found that soil infiltration under oil palm plantation is significantly lower compared to those from other land-use types. Soil degradation and compaction can be the reason for the lower infiltration in oil palm plantation. In addition, according to the tree transpiration measurements carried out by CRC990 researchers in A02 group, oil palm showed higher transpiration compared the other land-use types. The research question is, do the increased transpiration and reduced infiltration had caused significant impact on the catchment water yield and respective water scarcity? For this purpose, we calibrated and validated catchment hydrological model (SWAT) and upscaled relative impact of change in plant transpiration and soil infiltration on the catchment water yield component. The result of this study will confirm whether oil palm plantation significantly contributed to the local water scarcity problem found in the study area during dry season.