Journal of Korean Society of Forest Science (한국산림과학회지)

Korean Society of Forest Science (한국산림과학회)
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Investigation Into Reflectance Characteristics of Trees Infected by Pine Wilt Disease

소나무재선충병 감염목의 분광반사 특성 구명

  • Kim, So-Ra (Division of Environment Science and Ecological Engineering, Korea University) ;
  • Lee, Woo-Kyun (Division of Environment Science and Ecological Engineering, Korea University) ;
  • Nam, Kijun (Division of Environment Science and Ecological Engineering, Korea University) ;
  • Song, Yongho (Division of Environment Science and Ecological Engineering, Korea University) ;
  • Yu, Hangnan (Division of Environment Science and Ecological Engineering, Korea University) ;
  • Kim, Moon-Il (Division of Environment Science and Ecological Engineering, Korea University) ;
  • Lee, Jong-Yeol (Division of Environment Science and Ecological Engineering, Korea University) ;
  • Lee, Seung-Ho (Division of Forest Economics and Management, Korea Forest Research Institute)
  • 김소라 (고려대학교 환경생태공학과) ;
  • 이우균 (고려대학교 환경생태공학과) ;
  • 남기준 (고려대학교 환경생태공학과) ;
  • 송용호 (고려대학교 환경생태공학과) ;
  • 유항남 (고려대학교 환경생태공학과) ;
  • 김문일 (고려대학교 환경생태공학과) ;
  • 이종열 (고려대학교 환경생태공학과) ;
  • 이승호 (국립산림과학원 산림경제경영과)
  • Received : 2013.05.31
  • Accepted : 2013.09.30
  • Published : 2013.12.31
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Abstract

Pine wilt disease has known as a serious forest disease in East Asia such as Japan, Korea and China. Fumigation and burning are considered as best way to treat infected tree at early detection. For investigate spectral reflectance characteristics of infected trees, periodic measurement has been done in both infected and non-infected trees. Infected and non-infected trees' reflectance (400 nm~2,500 nm wavelength) are detected from June to October with GER3700 spectrometer. Noise of reflectance data was corrected using cubic spline interpolation method. Reflectance was changed in most of infected trees with ranges Red (600 nm~700 nm) and Middle Infrared (1,400 nm~1,500 nm) within two months after injected by Pine Wood nematode (PWN), but there was no differences in non-infected trees. Infected and non-infected trees were compared statistically in each period. As a result, we found that a statistically significant difference was occurred at Red and Middle Infrared (MIR) 2 months after injection (p<0.05), however, no significant difference in near infrared (p>0.05). Therefore, the early detection of infested pine trees by PWN may possible through detecting the change of spectral reflectance at red and MIR.

소나무재선충병(Bursaphelenchus xylophilus)은 한국, 일본, 그리고 중국과 같은 동아시아의 소나무류 산림에 심각한 피해를 유발시킨다. 재선충병에 의한 병해는 그 치료방법이 훈증, 소각외에는 거의 없기 때문에 감염목을 조기 탐지하여 그 피해가 주변 임목 및 임분에 확산되지 않도록 하는 것이 최선책이라 할 수 있다. 본 연구에서는 소나무재선충병 감염목과 비감염목의 분광반사율을 주기적으로 측정하여 감염목의 분광반사 특성을 구명하였다. 이를 위하여, 6월에서 10월까지 GER3700 spectroradiometer를 이용하여 감염목과 비감염목의 400 nm~2,500 nm 파장대의 분광반사값을 측정하였다. 측정된 값의 noise를 보정하기 위하여 cubic spline 보간법을 사용하였다. 그 결과, 대부분의 감염목들은 재선충 주입 후 2개월 이내에 적색(600 nm~700 nm) 그리고 중적외선(1,400 nm~1,500 nm) 파장대에서 분광반사값의 변화를 보였으나, 비감염목들의 분광반사값은 어느 파장대에서도 특별한 변화가 나타나지 않았다. 시기별로 감염목과 비감염목의 분광반사값 변화를 통계적으로 비교해 본 결과, 소나무재선충 주입 2달 후 적색 파장대역과 중적외선 파장대역에서 가장 빠르게 통계적으로 유의한 차이를 보였으나(p<0.05), 근적외선 파장대역에서는 통계적으로 유의한 차이가 나타나지 않았다(p>0.05). 따라서 적색과 중적외선 파장대역에서의 분광반사율 변화를 통해 소나무재선충병 감염목의 조기 탐지가 가능한 것으로 판단되었다.

Keywords

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