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가장자리와 산불피해강도가 산불피해지역 초기식생재생에 미치는 효과
이주미 ( Joo Mee Lee ),원명수 ( Myoung Soo Won ),임주훈 ( Joo Hoon Lim ),이상우 ( Sang Woo Lee ) 한국산림과학회 2012 한국산림과학회지 Vol.101 No.1
The edge area with burn severity is known as significant factor that has great effects on the ecosystem recovery. However, there is little study on the edge area and its effects in the South Korea, Thus, this study aimed to analyze immediate responses of vegetation following forest fires due to combined effect of burn severity and edge-interior effect. Burn Severity (BS), or ΔNBR values were computed using satellite images of pre and post-forest fire in Samcheock areas, The burn forest was classified 231 1-km2 girds and these grids were further reclassified into 4 groups by BS type (low BS and high BS areas) and forest areas (edge areas and interior areas). These four groups of grids including low BS-interior (group A), low BS-edge (group B), high BS-interior (group C) and high BS-edge (group D). Post-fire vegetation responses measured with ΔNDVI among four groups were then compared and tested by T-test. The results indicated that group C (ΔNDVI=0.047) and D (ΔNDVI = 0.059) showed considerably greater vegetation regeneration than those of low BS areas including group A (ΔNDVI = -0.039) and group B (ΔNDVI=-0.036). It was also observed that edges areas showed greater vegetation regeneration than interior areas when BS is the same. Group B (ΔNDVI = -0.036) showed greater ΔNDVI values than group A (ΔNDVI= -0.039) in low BS condition. Similar relationship is observed between group C and group D in high BS condition. Thus adequate restoration practices for burned areas might need to pay close attention to interior areas with low BS to minimize the secondary damages and to rehabilitate the burned forests.
이현주 ( Hyun Joo Lee ),이주미 ( Joo Mee Lee ),원명수 ( Myoung Soo Won ),이상우 ( Sang Woo Lee ) 한국산림과학회 2012 한국산림과학회지 Vol.101 No.1
CBI (Composite Burn Index) developed by USDA Forest Service is a index to measure burn severity based on remote sensing. In Korea, the CBI has been used to investigate the burn severity of fire sites for the last few years. However, it has been an argument on that CBI is not adequate to capture unique characteristics of Korean forests, and there has been a demand to develop KCBI (Korean Composite Burn Index). In this regard, this study aimed to develop KCBI by adjusting the CBI and to validate its applicability by using remote sensing technique. Uljin and Youngduk, two large fire sites burned in 2011, were selected as study areas, and forty-four sampling plots were assigned in each study area for field survey. Burn severity (BS) of the study areas were estimated by analyzing NDVI from SPOT images taken one month later of the fires. Applicability of KCBI was validated with correlation analysis between KCBI index values and NDVI values and their confusion matrix. The result showed that KCBI index values and NDVI values were closely correlated in both Uljin (r =-0.54 and p<0.01) and Youngduk (r = -0.61 and p<0.01). Thus this result supported that proposed KCBI is adequate index to measure burn severity of fire sites in Korea, There was a number of limitations, such as the low correlation coefficients between BS and KCBI and skewed distribution of KCBI sampling plots toward High and Extreme classes. Despite of these limitations, the proposed KCBI showed high potentials for estimating burn severity of fire sites in Korea, and could be improved by considering the limitations in further studies.
산림 공간구조 특성과 산불 연소강도와의 관계에 관한 연구
이상우 ( Sang Woo Lee ),임주훈 ( Joo Hoon Lim ),원명수 ( Myoung Su Won ),이주미 ( Joo Mee Lee ) 한국환경복원녹화기술학회 2009 한국환경복원기술학회지 Vol.12 No.5
Because fire has significant impacts on fauna and flora in forest ecosystems, as well as socioeconomic influences to local community, it has been an important field of study for decades. One of the most common ways to reduce fire risk is to enhance fire-resilience of forest through fuel treatments including thinning and prescribed burning. Since fuel treatment can`t be practiced over all forested areas, appropriate and effective strategies are needed. The present study aims to look at the relationship between spatial characteristics of forest structure measured with landscape pattern metrics and burn severity to provide guidelines for effective fuel treatments. Samchuck fire was selected for the study, and 232 grids covering the study areas were generated, and the grid size was 1km. The burn severity is measured with dNBR derived from satellite imagery, and spatial characteristics of forest structure were measured using FRAGSTATS for both landscape and class levels for each 1km grid. The results of this study strongly indicated that heterogeneity in composition and configuration of forests may significantly reduce burn severity. By enhancing heterogeneity of forests, fuel treatments for fire-resilience forest could be more effective.