Development for Data Base for Eco-System Changes and Emission Changes of GHG Using Remote Sensing and GIS in Sumatra Island, Indonesia

GHG flux of soil varies depend on type the site condition and season. The values of each unit were based on flux measurement conducted in November 1997 in several points of Pasir Mayang area (Fig.2). The calculation results of total flux based on 1993, 1995 and 1999 land cover data for major land cover presented in Fig. 4. Comparison of the total GHG flux of the three periods of time studies could not be performed since there are still no information on GHG flux of soil surface under cash crops plantation and secondary forest. However, it seems that the conversion of natural forest will cause on the decrease of methane gas absorption and induce the increase of nitrous oxide and carbon dioxide flux emission as Fig.5.

Note :

• Above ground biomass was estimated using the data of BIOTROP, Indonesia.
• The calculation of GHG fluxes was based on mean value of 10 months (10 time) measurement.
• The measurements were made in Jan., Feb., Mar., June, July, Aug., Sep., Oct., Nov. and Dec