우리나라에서 수수-수단그라스 교잡종에 대한 극단기상과 정상기상 간 생산량 비교
Comparison of Forage Production between Extreme Weather and Normal Weather for Sorghum-Sudangrass Hybrid (Sorghum bicolor L.) in Korea
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초록
본 연구는 우리나라에서 수수-수단그라스 교잡종(sorghum bicolor L.: SSH)에 대해 극단기상과 정상기상 간 생산량을 비교할 목적으로 수행하였다. SSH 데이터(n=1,025)는 농촌진흥청의 신품종 적응성 실험보고서(1979―2019)로부터 수집하였다. 기상자료는 기상청으로부터 평균기온, 최저기온, 최고기온, 최대 강수량, 누적 강수량, 최대풍속, 평균풍속 및 일조시간을 10일 기준으로 계산하여 수집하였다. 극단기상과 정상기상 간 구별을 위해 상자 그림을 이용하여 탐색하였다. 극단기상과 정상기상 간 생산량 차이는 5% 유의수준 하에서 t-검정 및 ANOVA를 통해 확인하였다. 그 결과, 극단기상은 극단적으로 강한 바람을 동반한 봄 가뭄, 극단적으로 높은 강우량을 기록하는 여름장마와 가을장마가 두드러졌다. 예측 생산량 피해(kg/ha)는 각각 1,961―6,541, 2,161―4,526 및 508―5,582로 나타났다. 본 연구는 우리나라의 SSH에 대한 취약성 및 피해 산정에 도움이 되는 기초자료로서 극단기상과 정상기상 사이의 생산량 차이를 확인하는 데 의의가 있다.
Abstract
This study evaluated the differences in sorghum-sudangrass hybrid (SSH) forage production in Korea under extreme and normal climate conditions. Data for SSH (n=1,025) sources were analyzed from the Rural Development Administration’s adaptability reports on new varieties between 1979 and 2019. The climatic data, including mean and highest air temperatures, maximum hourly precipitation, accumulative precipitation, maximum and mean wind speeds, and sunshine duration, were derived from the Korean Meteorological Administration and were calculated for ten-day intervals during the SSH growth period. Box plots were used to detect outliers and distinguish extreme and normal climate conditions. The dry matter yield disparity under extreme and normal climate conditions was determined using a t-test at a 5% significance level. The study identified a considerable incidence of spring droughts accompanied by severe winds and a summer-to-autumn monsoon season with excessive rainfall under extreme climatic conditions. The estimated impact on SSH production (kg/ha) ranged from 1,961–6,541 in spring, 2,161–4,526 in summer, and 508–5,582 in autumn. The study establishes a foundation for assessing vulnerability and estimating damages associated with climatic variations in Korea, underscoring the importance of evaluating the impact of extreme weather events on forage production.
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