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http://dx.doi.org/10.5389/KSAE.2017.59.1.045

Analysis of Paddy Rice Water Footprint under Climate Change Using AquaCrop  

Oh, Bu-Yeong (Department of Rural Systems Engineering, Seoul National University)
Lee, Sang-Hyun (Department of Biological and Agricultural Engineering, Texas A&M University)
Choi, Jin-Yong (Department of Rural Systems Engineering, Research Institute of Agriculture and Life Sciences, Institutes of Green Bio Science and Technology, Seoul National University)
Publication Information
Journal of The Korean Society of Agricultural Engineers / v.59, no.1, 2017 , pp. 45-55 More about this Journal
Abstract
Climate change causes changes in rainfall patterns, temperature and drought frequency. Climate change impact influences on water management and crop production. It is critical issue in agricultural industry. Rice is a staple cereal crop in South Korea and Korea uses a ponding system for its paddy fields which requires a significant amount of water. In addition, water supply has inter-relationship with crop production which indicates water productivity. Therefore, it is important to assess overall impacts of climate change on water resource and crop production. A water footprint concept is an indicator which shows relationship between water use and crop yield. In addition, it generally composed of three components depending on water resources: green, blue, grey water. This study analyzed the change trend of water footprint of paddy rice under the climate change. The downscaled climate data from HadGEM3-RA based on RCP 8.5 scenario was applied as future periods (2020s, 2050s, 2080s), and historical climate data was set to base line (1990s). Depending on agro-climatic zones, Suwon and Jeonju were selected for study area. A yield of paddy rice was simulated by using FAO-AquaCrop 5.0, which is a water-driven crop model. Model was calibrated by adjusting parameters and was validated by Mann-Whitney U test statistically. The means of water footprint were projected increase by 55 % (2020s), 51 % (2050s) and 48 % (2080s), respectively, from the baseline value of $767m^2/ton$ in Suwon. In case of Jeonju, total water footprint was projected to increase by 46 % (2020s), 45 % (2050s), 12 % (2080s), respectively, from the baseline value of $765m^2/ton$. The results are expected to be useful for paddy water management and operation of water supply system and apply in establishing long-term policies for agricultural water resources.
Keywords
AquaCrop; water footprint; green water; blue water; climate change;
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Times Cited By KSCI : 7  (Citation Analysis)
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