KAJIAN DAMPAK DINAMIKA PENGGUNAAN LAHAN TERHADAP EROSI DAN KONDISI HIDROLOGI DAS WANGGUDS

Abstract

ABSTRACT
Land erosion and hydrological conditions of Wanggu-DS watershed assessed based on the data: land use dynamic, soil physical, erosion, and run off coefficient, and ration discharge (Qmax/Qmin). This research is using survey methods and experimental plots. The data land biophysical: climate, topography, soil type and land use derived from the results of previous studies. This research was conducted from July 2009 - Juni 2010. The objective of the research was assessed: 1) the impact of land use dynamic in Wanggu watershed to erosion, ratio discharge (Qmax/Qmin), 2) to study of land use dynamic and agrotechnology model that can improve soil infiltration capacity and water availability, reduce the ratio discharge (Qmax/Qmin) and rate of erosion. The results of the research showed that land use dynamic which incompatible with its ability to cause increasing of erosion on: up land agriculture, shrubs, settlements with the erosion > Tollerable Soil Loss are 36.3 >21.0; 21.4 >14.9 and 19.5 >18 ton/ha/yr on slopes > 8%, run off is 626.9 mm/yr, coefficient run off 0.32, average ratio of river discharge (Qmax/Qmin) is 29.3 but not to forest land use. Land use planning model and agroteknology of the best is Scenario-5 can decrease of land erosion, run off, coefficient run off, ratio of discharge (Qmax/Qmin fron 33.56 to be 10.03).