2025년 의성-안동 산불 피해 소나무의 초기 고사에 대한 형성층 전기저항과수피 그을음 지표의 판별력 평가

초록

Cambial electrical resistance (CER), bark scorch height (BSH), and bark scorch index (BSI) were measured in 126 Pinus densiflora trees in the Baegunjeong and Gaehosong forest area damaged by the 2025 Uiseong-Andong wildfire. Field measurements were conducted on 3 July 2025, approximately three months after the fire. A subsequent survey in March 2026, approximately one year after the fire, classified the trees into 109 living and 17 dead individuals. Differences in diameter at breast height (DBH), tree height, CER, BSH, and BSI between the two groups were compared, and correlations of CER with BSH and BSI were analyzed. The discriminatory performance of each indicator was additionally evaluated using logistic regression and receiver operating characteristic curve analysis. DBH and tree height did not differ significantly between the two groups. In contrast, CER was significantly higher in dead trees (20.6 kΩ) than in living trees (11.3 kΩ) (p = 0.008), and both BSH and BSI were also significantly higher in dead trees (p < 0.001). CER showed significant positive correlations with BSH (r = 0.356) and BSI (r = 0.405), although the correlations were moderate in strength (p < 0.001). The areas under the curve were 0.818 for BSI, 0.804 for BSH, and 0.700 for CER. At the optimal cut-off values, BSI and BSH showed high sensitivities of 94.1% and 88.2%, respectively, whereas CER showed a high specificity of 88.1%. These results suggest that BSH and BSI may be applied to the screening of dead trees and CER to the confirmation of living trees. Combined use of the three indicators is expected to enable a more comprehensive assessment of fire damage.

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