Laju Infiltrasi pada Berbagai Jenis Penggunaan Lahan Di DAS Ciambulawung, Kampung Lebakpicung, Lebak-Banten

Abstract

Water is one of important resources to all living entities. Nonetheless, available water decreases by time. Water has been known having a close relation to soil. One was important factor on water availability is the infiltration. In this study, the relationship of land use and soil physical properties to infiltration rate ware studied. To achive the goal, infiltration was measured using double ring infiltrometer. The research took place in TNGHS area and the soil physics laboratory, Balittan, Bogor from February until July 2011. Samples were determined using stratified radom sampling method, based on land use and soil physical properties. Meanwhile, statistical analysis involved correlation analysis, and regression, especially stepwise regression. The result showed that soil infiltration rate ranged from moderate up to rapid. It was found that land use types tend to have a relationship with infiltration rate, as well as soil physical properties. Based on field measurements, infiltration rate in the forest area was about 51,5 cm/hours (very rapid), while in sengon plantation was 15 cm/ hours (rapid). It appears that mixed garden achieved fairly rapid infiltration (5 cm/ hours), which was quite similar to agricultural fields (2,75 cm/ hours; middle). Statistical analysis showed that variables tend to have multicollinearity. Land use presented by NDVI, did not correlate to flow infiltration. This means that NDVI value was less robust to estimate land use parameters. Meanwhile, analyses of soil characteristics, indicated that only rapid pore drainage, bulk dencity, particle dencity, and pemeability statistically influenced infiltration rate.