"Sediment yield from various land use practices in a hilly tropical area of the Lampung region, South Sumatra, Indonesia."

"Afandi; Rosadi, B.; Maryanto; Nurarifani; Utomo, M.; Senge, M.; Adachi, T. "

"Sediment yield from various land use practices in a hilly tropical area of the Lampung region, South Sumatra, Indonesia."

2002

"Sediments transported from various land uses and entrapped by natural vegetative filter were measured from January to November 1999 in a hilly humid tropical area of Lampung, South Sumatra, Indonesia. A very simple sediment trap made from a PVC pipe with diameter of 10.9 cm was designed for measuring the sediment yield. Five types of land uses were chosen as follows: (a) coffee garden in multistrata system followed by rain-fed agriculture and grass filter, (b) mixed-coffee garden followed by short shrub filter, (c) clean-weeded coffee garden followed by long shrub filter, (d) clean-weeded coffee garden, and (e) secondary forest followed by new forest remnant. The measurement during eleven months showed that the mixed-coffee garden produced the highest sediment yield (719.7g/square m), and the lowest sediment yield was derived from secondary forest area (0.08g/square m). The sediment yield from clean-weeded coffee system was around 93.4-279.7 g/square m, and multistrata system indicated a low sediment yield (2.3 g/square m). Although mixed-coffee garden showed a very high yield of sediment, natural vegetative strips entrapped 99.7% of the sediment. The vegetative filter zone covered with grass (1.5m long) and short shrubs (3m in length) could entrap 93.5% and 99.7% of sediment respectively, and the long shrub filter (12 m in length) could entrap only 52.5% of the sediment due to the concentrated flow in the longer slope. The surface cover condition of the land use system and farming activities (weeding, tillage, fertilizer application) indicated a high contribution on sediment yield than the other erosion factor."

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