Water in the forest: Rain-vegetation interaction to estimate canopy interception in a tropical borneo rainforest

Canopy interception has an important role in the hydrological cycle. This research was conducted in virgin forest area and Intensive Forest Management System (IFMS) with selective cutting and line planting technique in IUPHHK-HA PT. Sari Bumi Kusuma. This study aims to determine: 1) the value of canopy interception in the virgin forest area and IFMS with selective cutting and line planting technique 2) the relationship between gross rainfall and canopy interception in virgin forest area and IFMS with selective cutting and line planting technique. The value of gross rainfall, stemflow, throughfall, and vegetation canopy cover were used to determine the canopy interception. Canopy interception was calculated by volume balance approach's method. The relationship between gross rainfall and canopy interception was analyzed using SPSS software and SigmaPlot. The results of this research show that the average value of interception in the Virgin Forest is 30,44, while the average value of interception in Selective Cutting and Line Planting Silvicultural System (TPTJ) is 15,68. This result shows that there is a strong and positive relationship between gross rainfall and canopy interception, which is expressed in the equation Ic ^Ha = 0,0001 (P) ^2,9972 dan Ic ^TPTJ = 0,0004 (P) ^2,5795