Abstract:
Papua is the final fortress of forests in Indonesia. However, floods recently occurred in Jayapura, Paniai, and Manokwari, among causes is improvement runoff and sediment. The purpose of this study is to find the effect of land use change on the hydrological behavior of runoff and sediment in the Arui watershed. Five treatments: forest, plantation, shrubs, rice field and settlements. Study of physical and chemical properties of soils and infiltration on 5 landuse. The results showed that settlement land use significant effect on the runoff, the amount of runoff in the settlement, because settlement dominated by a layer of concrete, paving, soil is hardened thus difficult infiltration and water, flows freely. The land use as forest a rainfall does not have a significant effect on runoff due to the big biodiversity. Rainfall in the rainy season on land use was significantly shrubs against runoff and sediment, caused by vegetation dominated by Imperata cylindrica and Piper aduncum make the land that is not maintained, open and as a pet food which so that water easily erodes and surface runoff. The use of rice field land for rain did not significantly affect runoff and sediment due to farmers who had applied soil and water conservation techniques such as mounds, use of organic fertilizers, alley cropping and intercropping. Value of infiltration five land use are slow and the medium with the highest infiltration on the use of rice field while the lowest settlement.
Increased infiltration will reduce surface runoff affecting the flood.
