STUDY OF INFILTRATION RATE BASED ON SOIL PHYSICAL PROPERTIES AND VEGETATION DENSITY IN TELAGA WARNA CISARUA NATURE PARK, BOGOR

• Main Author: Alya Khirunnisa, Nurina
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/43099
• Institution: Institut Teknologi Bandung

Telaga Warna Cisarua Nature Park, Bogor is a 4,6 hectare conservation area that was previously stated as nature preserve. However, this area still has significant environmental services to support the surrounding ecosystem and prevent the degradation of the upstream Ciliwung River Basin in the hydrological aspect. The existence of the lake also needs to be maintained to support the sustainability of the nature park. A form of management to determine and maintain the condition of hydrological aspect in this area is by determining the volume of infiltration. Infiltration is affected by soil physical properties and vegetation density. The correlations between infiltration rate, soil physical properties, and vegetation density are measured to estimate the level of groundwater reserves in this area. The objectives of this study are: to measure the correlation between soil physical properties and infiltration rate; to measure the correlation between vegetation density and infiltration rate; and to measure the infiltration volume at Telaga Warna Cisarua Nature Park in a year. The study began from December 2018 to May 2019. The data were obtained by measuring and taking samples in the field, satellite imagery, and supporting data from related parties. Data collection in the field was carried out by making eight sample plots based on the species-area curve developed by Rice and Kelting (1955) at three observation stations determined by purposive sampling. Soil samples are measured in the field and in the laboratory to determine soil texture, mass density, porosity, organic matter content, and soil moisture content. In predicting the infiltration rate the Horton Model is used. The correlations between variables were measured by multiple linear regression with a 95% confidence level to determine the coefficient of determination (R2). The correlation between soil physical properties and infiltration rate has a value of R2 = 0.861 (very strong) with mass density, organic matter content and soil water content together affecting the infiltration rate. The correlation between vegetation density and infiltration rate has a value of R2 = 0.399 (low). The infiltration volume in Telaga Warna Cisarua Nature Park based on Horton Model is 226,155,012 m3 / year.