[논문]APEX 모델을 이용한 콩 재배 밭 전환 논의 물수지 특성 평가

최순군; 정재학; 엽소진; 김명현; 김민경

doi:10.5389/ksae.2021.63.4.055

APEX 모델을 이용한 콩 재배 밭 전환 논의 물수지 특성 평가
Water Budget Assessment for Soybean Grown in Paddy Fields Converted to Uplands Using APEX Model 원문보기

한국농공학회논문집 = Journal of the Korean Society of Agricultural Engineers, v.63 no.4, 2021년, pp.55 - 64

최순군 (Climate Change Assessment Division, National Institute of Agricultural Sciences) , 정재학 (AgriLife Research, Texas A&M University) , 엽소진 (Climate Change Assessment Division, National Institute of Agricultural Sciences) , 김명현 (Climate Change Assessment Division, National Institute of Agricultural Sciences) , 김민경 (Climate Change Assessment Division, National Institute of Agricultural Sciences)

Abstract ▼ AI-Helper

The expansion of upland crop cultivation in rice paddy fields is recommended by the Korean government to solve the problem of falling rice price and reduction of rice farmer's income due to oversupply of rice. However, water use efficiency is significantly influenced by the land use change from paddy field to upland. Therefore, this study aimed to evaluate the water budget of soybean grown in using APEX (Agricultural Policy and Environmental eXtender) model. The amount of runoff was measured in a test bed located in Iksan, Jeollabu-do and used to calibrate and validate the simulated runoff by APEX model. From 2019 to 2020, the water budget of soybean grown in uplands were estimated and compared with the one grown in paddy fields. The calibration result of AP EX model for runoff showed that R2 (Coefficient of determination) and NSE (Nash-Sutcliffe efficiency) were 0.90 and 0.89, respectively. In addition, the validated results of R2 and NSE were 0.81 and 0.62, respectively. The comparative study of each component in water budget showed that the amounts of evapotranspiration and percolation estimated by APEX model were 549.1 mm and 375.8mm, respectively. The direct runoff amount from upland was 390.1 mm, which was less than that from paddy fields. The average amount of irrigation water was 28.7 mm, which was very small compared to the one from paddy fields.

주제어

표/그림 (9)

그림 Fig. 1 Location of study area and meteorological station (google.com/earth)
표 Table 1 Schedule of test bed operations
그림 Fig. 2 Cultivation characteristics of the test bed (furrow shape and seed row spacing)
그림 Fig. 3 Input/output of APEX model
그림 Fig. 4 Sampling system of runoff water in test bed
그림 Fig. 5 Sensitivity analysis of parameters for runoff in APEX model
그림 Fig. 6 APEX model calibration and validation result for runoff of soybean grown in paddy field
그림 Fig. 7 Water budget characteristics of soybean grown in paddy field (1991∼2020)
표 Table 2 Comparison of water budget between rice paddy and soybean grown in paddy field

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