Keywords :
Long-Term Monitoring; Remote Sensing; CLUE-S Model
บทคัดย่อ :
Deforestation has been given much attention in land use and landscape changes because of the high rate of forest change and the ecological importance of the forest ecosystem. Forest loss in Thailand was ranked the highest of all countries in the Greater Mekong subregion and as fourth in the "top 10" of tropical countries in terms of annual rate of loss in 1995 (CFAN 2005 ) . The Royal Forest Department in Thailand has had long-term monitored forest cover using satellite images for the last four decades. The results revealed that in 1961 the forest cover was 53.3% of the country area whereas approximately 25.2% remained in 1998. The average annual loss was approximately 400,000 ha, or 2.0%, during this 37-year period (RFD 2005 ). Deforestation in Thailand is mainly caused by commercial logging of primary forest, by agribusiness, and by urban development, driven by ongoing population growth and the national development strategy to gain foreign income (Trisurat 2007). Deforestation has a number of consequent effects on the biological and physical environment, such as habitat loss, habitat fragmentation, species extinction, deterioration of soil properties, drought, and fl ooding, among others. Habitat fragmentation is the process of dissecting large, contiguous areas of similar native vegetation types into smaller units separated by different vegetation types and/or areas of intensive human activity (Saunders et al. 1991 ) . Fragmentation occurs in conjunction with loss of area and includes changes in composition, shape, and con fi guration of resulting patches (Rutledge 2003 ) . A number of landscape indices have been developed to measure the effects of fragmentation. Increased fragmentation often results in subdivision of the natural environment into isolated patches of different size and shapes (Turner and Corlett 1996 ) . The effects of fragmentation include decreased species richness, increased habitat edges (thus favoring species adapted to edge habitats but preventing species living in core areas), diminished species distribution, and gene fl ow (Raabova et al. 2007 ) . Another consequence of habitat fragmentation is alteration of physical fl uxes of radiation, wind, and water across the landscape (Saunders et al. 1991 ) .
เอกสารอ้างอิง :
Trisurat, Y. (2012). Long-term monitoring and prediction of ecosystem using remote sensing and the CLUE-S Model: Sakaerat Environmental Research Station. In The Biodiversity Observation Network in the Asia-Pacific Region (pp. 309-319). Springer, Tokyo.
