중량식 라이시미터를 활용한 재배시기에 따른 조생종 벼의 물 필요량 평가 (Evaluation of water requirements for early maturing rice on different cultivation period using weighable lysimeter)

서지정보

· 발행기관 : 한국기후변화학회
· 수록지 정보 : 한국기후변화학회지 / 16권 / 2호 / 133 ~ 145페이지
· 저자명 : 박민경, 옥정훈, 김동현, 허승오, 황선아, 오부영

초록

Water scarcity, which is exacerbated by climate change, poses significant challenges for agriculture, which accounts for more than half of global water consumption. This study investigated the water balance of early-maturing rice cultivation over three years using weighable lysimeters. Cultivation periods were classified as optimum season (OS) and late season (LS), and the analysis compared sandy loam and silty clay loam soils under continuous irrigation (maintaining a 5-cm water level).
Water inflow and outflow were calculated based on changes in lysimeter weight. Sandy loam demonstrated higher water inflow and outflow compared to silty clay loam, mainly due to its faster infiltration rate and greater subsurface outflow under continuous irrigation. The OS cultivation period exhibited greater water inflow and outflow than LS, which was attributed to higher OS evapotranspiration rates. The crop coefficients for OS were 0.97, 1.21, 1.61, and 1.47 across growth stages, peaking mid-growth, while those for LS were 0.86, 1.29, 1.26, and 1.45, with the highest values appearing later in the growth cycle. Water requirements were calculated as 4.7 mm day-1 for OS and 3.8 mm day-1 for LS, with the highest demand recorded in 2020 due to increased solar radiation and rainfall. Overall, OS required more water than LS due to higher mean temperatures and cumulative radiation. These findings offer valuable data for water resource management and adaptive agricultural strategies to address climate-induced water scarcity.

영어초록

Water scarcity, which is exacerbated by climate change, poses significant challenges for agriculture, which accounts for more than half of global water consumption. This study investigated the water balance of early-maturing rice cultivation over three years using weighable lysimeters. Cultivation periods were classified as optimum season (OS) and late season (LS), and the analysis compared sandy loam and silty clay loam soils under continuous irrigation (maintaining a 5-cm water level).
Water inflow and outflow were calculated based on changes in lysimeter weight. Sandy loam demonstrated higher water inflow and outflow compared to silty clay loam, mainly due to its faster infiltration rate and greater subsurface outflow under continuous irrigation. The OS cultivation period exhibited greater water inflow and outflow than LS, which was attributed to higher OS evapotranspiration rates. The crop coefficients for OS were 0.97, 1.21, 1.61, and 1.47 across growth stages, peaking mid-growth, while those for LS were 0.86, 1.29, 1.26, and 1.45, with the highest values appearing later in the growth cycle. Water requirements were calculated as 4.7 mm day-1 for OS and 3.8 mm day-1 for LS, with the highest demand recorded in 2020 due to increased solar radiation and rainfall. Overall, OS required more water than LS due to higher mean temperatures and cumulative radiation. These findings offer valuable data for water resource management and adaptive agricultural strategies to address climate-induced water scarcity.

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