A WATERSHED-SCALE ASSESSMENT OF PRESENT AND FUTURE CARBON STOCK: GIS APPLICATION IN KHLONG YAI WATERSHED OF THAILAND

摘要

A study was carried out to assess the current carbon stock in different agricultural land uses and investiga te the respe ctive trend of changes in the com ing ten years using available methodologies. A nested quadrate sampling technique of different quadrate sizes was used to collect the biom ass data of eleven major land uses of the watershed. Existing soil data was used to estimate soil carbon. All the data preparation and analysis works were carried out in GIS environm ent. The total carbon stock of agricultural land uses of the study area was estimated to be 20.5 million tons, out of which 4 1.5% was biomass carbon and 58.5% was soil carbon. Para rubber land use had the highest av erage biomass C while paddy land use had the lowest. It was also analyzed that th e type of land uses that would m aintain desirable level of C in coming ten years from sustainability viewpoints.