Korean Journal of Environmental Biology (환경생물)

Korean Society of Environmental Biology (한국환경생물학회)
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Assessment of drought stress in maize growing in coastal reclaimed lands on the Korean Peninsula using vegetation index

식생지수를 활용한 한반도 해안 간척지 옥수수의 한발스트레스 해석

  • Seok In Kang (Department of Plant Resources and Landscape Architecture, Hankyong National University) ;
  • Tae seon Eom (Department of Plant Resources and Landscape Architecture, Hankyong National University) ;
  • Sung Yung Yoo (Institute of Ecological Phytochemistry, Hankyong National University) ;
  • Sung ku Kang (Department of Fruit Science, Korea National University of Agriculture and Fisheries) ;
  • Tae Wan Kim (Department of Plant Resources and Landscape Architecture, Hankyong National University)
  • 강석인 (한경국립대학교 식물자원조경학부) ;
  • 엄태선 (한경국립대학교 식물자원조경학부) ;
  • 유성영 (한경국립대학교 식물생태화학연구소) ;
  • 강성구 (국립한국농수산대학교 원예학부) ;
  • 김태완 (한경국립대학교 식물자원조경학부)
  • Received : 2023.08.08
  • Accepted : 2023.09.15
  • Published : 2023.09.30
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Abstract

The Republic of Korea reclaimed land to increase its food self-sufficiency rate, but the yield was reduced due to abnormal climate. In this study, it was hypothesized that rapid and continuous monitoring technology could help improve yield. Using the vegetation index (VI) analysis, the drought stress index was calculated and the drought stress for corn grown in Hwaong, Saemangeum, and Yeongsan River reclaimed tidal land was predicted according to drying treatment. The vegetation index of corn did not decrease during the last 20 days of irrigation when soil moisture rapidly decreased, but decreased rapidly during the 20 days after irrigation. The reduction rate of the vegetation index according to the drying treatment was in the order of Saemangeum>Yeongsan River>Hwaong reclaimed tidal land, and normalized difference vegetation index(NDVI) decreased by approximately 50% in all reclaimed tidal lands, confirming that drought stress occurred due to the decrease in moisture content of the leaves. In addition, structure pigment chlorophyll index (SIPI) and photochemical reflectance index (PRI), which are calculated based on changes in light use efficiency and carotenoids, were reduced; drought stress caused a decrease in light use efficiency and an increase in carotenoid content. Therefore, vegetation index analysis was confirmed to be effective in evaluating and predicting drought stress in corn growing on reclaimed tidal land corn.

본 연구는 건조처리에 따른 화옹, 새만금, 영산강 간척지 토양에서 키운 옥수수의 한발스트레스를 분광 반사율 분석을 통해 해석하였다. 옥수수의 식생지수는 모든 간척지 처리구에서 토양수분이 급격히 감소하는 관수 정지 20일후까지는 감소하는 경향이 없는 것이 확인되었으며 이후 급격히 감소하는 경향이 확인되었다. 건조처리에 따른 식생지수의 감소율은 새만금>영산강>화옹 간척지 순으로 나타났으며, NDVI는 모든 간척지 토양에서 50%가량 감소하여 잎의 수분함량 감소로 인한 한발스트레스가 발생한 것이 확인되었다. 모든 간척지 토양에서 카로티노이드의 변화를 기반으로 계산되는 SIPI와 PRI가 크게 감소하여 한발스트레스로 인한 광이용효율의 감소와 카로티노이드 함량의 증가가 일어난 것으로 판단되었다.

Keywords

Acknowledgement

본 연구는 2021학년도 한경국립대학교 연구년 경비의 지원에 의한 것임.

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