Layanan lingkungan agroforestri berbasis kopi: cadangan karbon dalam biomasa pohon dan bahan organik tanah (studi kasus dari Sumberjaya, Lampung Barat)

Loss of carbon (C) stocks from terrestrial ecosystems continues to be a significant contributor to the increasing concentrations of greenhouse gases in the atmosphere. Forest conversion to intensive agricultural systems leads to a reduction of ecosystem C stocks, mainly due to removal aboveground biomass as harvest and loss of C asCO2 through farm activity such as burning and decomposition of organic materials. We estimated the C sequestered by vegetation derived initially by complete land clearing, based on C stored in the biomass, necromass and in the soil as soil organic matter (SOM). This research was conducted in 1998 and 2001/2002 in agroforestry gardens in Sumberjaya (West Lampung). The purpose of this research was (1) to estimate the C stock in agroforestry coffee based system, (2) to measure the C stock of shade trees in coffee based agroforestry systems, (3) To measure the soil C stock. The measurements were done along Way Besai catchment covering five type of land uses i.e. Remnant forest, coffee based agroforestry system (multistrata coffee system), shaded- coffee system, and monoculture (sun) coffee system. Agroforestry systems in Sumberjaya maintain above-ground C stocks of about 18 21 Mg ha-1 compared to 10 Mg ha-1 for sun coffee, and 195 Mg ha-1 for remnant forest. The soil C stock in the agricultural system was 50% lower than that in the forest (64 Mg ha-1). The annual C accumulation rate of the coffee-based systems was about 0.9 Mg C ha-1 yr-1, and 0.6 Mg ha-1 for shaded coffee systems. As a part of Clean Development Mechanism, further activity on identification of tree diversity and C stock of different of agroforestry types inIndonesia is still needed..

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