Remote sensing analysis of forest damage by selection logging in the Kabaung Reserved Forest, Bago Mountains, Myanmar |
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Authors: | Rosy Ne Win Reiji Suzuki Shinya Takeda |
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Institution: | (1) Graduate School of Asian and African Area Studies, Kyoto University, 46 Shimoadachi-cho Yoshida, Sakyo-ku, Kyoto 606-8501, Japan;(2) Institute of Sustainability Science and Center for Southeast Asian Studies, Kyoto University, 46 Shimoadachi-cho Yoshida, Sakyo-ku, Kyoto 606-8501, Japan |
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Abstract: | Selection logging is a principal management scheme in natural teak-bearing forests in Myanmar. Monitoring the spatial extent
and intensity of selection logging is important for sustainable forest management. This study applied the normalized difference
vegetation index (NDVI) image differencing method using two SPOT-5 pan-sharpened images (2.5 m spatial resolution) taken in
October 2007 and January 2009 to analyze canopy changes associated with damage from forest harvesting. According to the pixel-based
analysis, NDVI changes were larger in most logging road/log landing points whereas smaller NDVI changes were seen in most
unlogged points. NDVI changes in teak stump areas were related to distance from a logging road and the number of stumps within
the estimated crown area (a circular area with a 10 m radius from the center of each stump). A Fisher’s exact test showed that one of the main factors
causing the high NDVI change in teak stump areas was the effect of road construction. The distribution pattern of teak stumps
indicated that teak stumps with estimated crown areas that contained more than one stump had high mean change in NDVI. The spectral difference between before and after logging
revealed that logging roads had a greater effect on canopy changes than teak stumps. |
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