|Title||Carbon Stock Assessment for A Forest-To-Coffee Conversion Landscape in Sumber-Jaya (Lampung, Indonesia): From Allometric Equations to Land Use Change Analysis. |
|Publication Type||Working Paper |
|Authors||Hairiah, K.; Arifin, J.; Berlian; Prayogo, C.; van Noorddwijk, M. |
|Year of Publication||2002 |
|Publication Language||English |
|Abstract||Assessment of above ground C stock were made in upland coffee production areas near Malang (East Java) and in Sumber Jaya in West Lampung (Sumatra, Indonesia). The above ground C stock of mono cultural and multistrata coffee based system were compared with that of remnant natural forest and plantation forestry. For the various systems we found general agreement between the two sites. For the remnant natural forest in Sumberjaya we derived an estimate of above ground tree C stock (195 Mg ha-l) that was j slightly above the value for a near-mature Pinus stand in Malang (175 Mg ha-I).
For the monoculture coffee systems we estimated aboveground tree C stocks of 7 Mg ha-1 in Sumberjaya, while this land cover type was not found in Malang. For simple shade coffee systems the values agreed well between sites (23 and 19 Mg ha-1 for Sumberjaya and Malang, respectively). The Malang version of the multi strata systems had a higher aboveground tree C stock than those in Sumber jaya (49 and 34 Mg ha-l, respectively), related to the presence of the larger fraction of 'forest' trees in the plots. Annual above ground C stock accumulation rates of mixed coffee system was found to be about 1.9
Mg ha-' yr-l, nearly double the value (1.0 Mg ha-1 yr-l) found for coffee monoculture system. A ratio of Corg/Cref value that can be expected for forest soils of the same texture and pH, sampled at the same elevation and soil type, can be used as a 'sustainability indicator'. A value of the Corg/Cref ratio of 1 mean a "fertile soil" similar to that found in the forest, smaller values indicate partial loss of the soil C stocks and related loss of soil fertility. Conversion of (remnant) forest to coffee based systems reduced the Corg/Cref ratio from 0.8 to 0.5, equivalent with a loss of soil C of about 57 Mg C ha-l.
|Keywords||Carbon stocks, CO2, coffee, natural forest, sumberjaya |
|Citation Key||635 |