Effects of climate change on paddy water use efficiency with temporal change in the transplanting and growing season in South Korea |
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| Authors: | Sang-Hyun Lee Seung-Hwan Yoo Jin-Yong Choi Bernard A Engel |
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| Institution: | 1.Department of Biological and Agricultural Engineering,Texas A & M University,College Station,USA;2.Rural & Bio-Systems Engineering,Chonnam National University,Gwangju,Republic of Korea;3.Department of Rural Systems Engineering, Research Institute for Agricultural and Life Sciences,Seoul National University,Seoul,Republic of Korea;4.Department of Agricultural and Biological Engineering,Purdue University,West Lafayette,USA |
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| Abstract: | The aim of this study was to assess the effects of climate change on green and blue water use with temporal change in the transplanting and growing season for paddy fields in South Korea using the representative concentration pathway (RCP) 4.5 and 8.5 scenarios in 2025 (2011–2040), 2055 (2041–2070), and 2085 (2071–2100). The optimal transplant date determined by an accumulated temperature analysis, between 27 April and 21 May in 1995, was delayed until 29 June in 2085, and the average growing period was decreased by about 20 days in 2085. Changes in the transplanting season and growing period could influence the efficiency of future green water use and blue water savings. Approximately 810.5 Mm3 of green water was available during the 1995 transplanting season, but the predicted use of green water was 1524.7 Mm3 in future for the optimal transplanting season. In addition, 923.0 Mm3 of blue water savings can be expected in 2025. This study showed that appropriate change of transplanting season could mitigate the water requirements in paddy fields by optimizing phenology, improving green water efficiency, and blue water savings. |
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