Journal of the Korean Association of Geographic Information Studies (한국지리정보학회지)

The Korean Association of Geographic Information Studies (한국지리정보학회)
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Suitability Assessment of Arbor Day Using Satellite-Based Soil-Thaw Detection and Analyses

위성 기반의 토양 융해 탐지 자료를 이용한 식목일의 적합성 검토

  • Received : 2023.08.13
  • Accepted : 2023.10.13
  • Published : 2023.12.31
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Abstract

Arbor Day is a day that encourages people to plant trees and symbolizes the timing of planting. Arbor Day has been honored on April 5th in Korea, but it often does not agree to actual planting time due to global warming. This study confirmed the discrepancy between Arbor Day and regional soil-thawing times and reviewed alternative dates for tree planting using satellite-based soil-thaw data (FT-ESDR) from 1991 to 2020. Study results showed that the start time of planting on the Korean Peninsula, which was indicated by soil-thaw dates, was March 24 during 1991-2000, and it progressively changed to March 17 during 2011-2020. Should Arbor Day be changed based on soil-thaw periods, mid-March would be the most comprehensive, suitable alternative period considering the number of governmental administration units (cities and counties) and the land area of soil-thaw. Tree-Planting Day (March 14) and International Day of Forests (March 21) were found suitable for alternative dates to Arbor Day because they were close to the average soil-thaw time of Korean Peninsula (March 19) and land area whose soil-thaw time was within 10 days from those two dates ranged from 52.5% to 58.8% centered geographically on the mid-section of the peninsula. Since the periods of soil-thaw will continue to change due to climate change, it is necessary to reflect the trend of advancing planting periods in the future if Arbor Day is changed to an earlier date.

식목일은 식재를 권장하고 식재 시기가 도래했음을 상징하는 날로서 우리나라의 경우 4월 5일로 정해져 있지만, 지구온난화로 인해 식목일이 실제 식재 시기와 큰 차이를 보이고 있다. 본 연구에서는 1991~2020년 기간을 대상으로 인공위성 기반의 토양 융해 관측 자료(FT-ESDR)를 이용하여 식재 가능 시기의 시작과 현행 식목일 간의 불일치 현상을 확인하고 식재를 위한 대안 시기를 검토하였다. 연구 결과, 한반도의 토양 융해일은 평균적으로 1991~2000년 기간 중 3월 24일이었던 것이 2011~2020년 기간에는 3월 17일로 변화하였다. 토양 융해일을 고려하여 식목일을 변경할 경우, 시·군 수와 면적을 모두 고려할 때 3월 중순을 채택하는 것이 식재 시기의 적합성 측면에서 가장 포괄성이 큰 것으로 분석되었다. 따라서 현행 식목일의 대안으로 적합도가 높은 날은 식수절(3월 14일)과 세계 산림의 날(3월 21일)인데, 이는 시기적으로 한반도 평균 토양 융해일인 3월 19일에 가깝고, 토양 융해일과의 편차가 10일 이내 범위에 놓이는 면적이 한반도 중부를 중심으로 전체의 52.5~58.8%에 달한다는 장점을 갖는다. 기후 변화의 영향으로 토양 융해 시기는 변화할 것으로 예측되기 때문에 식목일 일자를 변경하고자 할 경우에는 미래의 식재 적합 시기가 지속적으로 앞당겨지는 경향을 반영할 필요가 있다.

Keywords

Acknowledgement

이 논문은 2020년 대한민국 교육부와 한국연구재단의 지원을 받아 수행된 연구이며(NRF-2020S1A5A2A01043062), 박강민(2023)의 석사학위청구논문 일부를 수정·보완한 것임.

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