Abstract:
Monitoring forest plantations and assessing soil loss with Multi-temporal satellite imageries in MaeMoh Mine has two objectives. They are 1) to monitor forest plantations in different time in MaeMoh Mine and 2) to assess soil loss in forest plantation areas in Mae Moh Mine. The period of time in 1996, 2003 and 2007 were selected to compare. Satellite images, Landsat 5 TM are in 1989,2006 and Landsat 7 ETM+ are in 2002 and 2011 were chosen to perform. Normalized Difference Vegetation Index (NDVI) and The Universal Soil Loss Equation (USLE) are used to analyze. The USLE consists of 5 factors. There are 1) rainfall erosivity factor (R-factor) 2) soil erodibility factor (K-factor) 3) slope length and steepness factor (LS-factor) 4) crop management factor (C-factor) and 5) soil conservation measures factor (P-factor). NDVI from the first step is used to calculate C-factor. Soil loss level is divided into 5 levels. They are 1) very low level (0-2 ton/rai/year) 2) low level (2-5 ton/rai/year) 3) moderate level (5-15 ton/rai/year) 4) high level (15-20 ton/rai/year) and 5) very high level (more than 20 ton/rai/year). The forest plantation monitoring results found that NDVI values before planting forest in 1996, 2003 and 2007 are 0.01, -0.04 and 0.15, respectively. NDVI values after planting forest are 0.23, 0.15 and 0.32, respectively. The results of assessing soil loss before planting forest in 1996, 2003 and 2007 are 162.26, 174.39 and 11.00 ton/rai/year, respectively. And soil loss after planting forest in 1996, 2003 and 2007 are 108.97, 114.89 and 18.50 ton/rai/year, respectively. In conclusion, soil loss level both before and after planting forest in 1996 and 2003 are very high level. And soil loss level before planting forest in 2007 is moderate level and after planting forest high level.