Abstract
Reducing CO2 emission is basically simultaneous processes between suppressing the carbon (C) release and increasing C sequestration. These can be carried out by plants as they have capability to fix CO2. The objective of this study was to investigate the C stock and sequestration in dryland with two systems, namely teak tree-based agroforestry and food crop system on Saobi Island, Madura. Data were collected from three measuring plots of each system, which were determined purposively. For the agroforestry system, the employed plot was the one having relatively regular tree spacing; while for the food crop system, the plot compromised the border where the jaran trees planted. Teak tree biomass and C stock were calculated by employing allometric equations, while for food crops, undergrowth, and litter were determined by using destructive methods. Carbon stock was calculated by an allometric equation and conversion from biomass weight. The results showed that agroforestry and food crop systems produced biomass up to 11.59 and 14.97 t/ha respectively. Although the biomass of both systems was quite similar, the C stock in the agroforestry system was higher than that of the food crop system; as the agroforestry one could sequestrate CO2 as much as 2308.23 t/ha, and 20.96 t/ha in existing conditions.
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