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http://dx.doi.org/10.5532/KJAFM.2012.14.4.207

Impacts of Climate Change on Rice Production and Adaptation Method in Korea as Evaluated by Simulation Study  

Lee, Chung-Kuen (National Institute of Crop Science, RDA)
Kim, Junwhan (National Institute of Crop Science, RDA)
Shon, Jiyoung (National Institute of Crop Science, RDA)
Yang, Woon-Ho (National Institute of Crop Science, RDA)
Yoon, Young-Hwan (National Institute of Crop Science, RDA)
Choi, Kyung-Jin (National Institute of Crop Science, RDA)
Kim, Kwang-Soo (Department of Plant Science. Seoul Nat'l Univ.)
Publication Information
Korean Journal of Agricultural and Forest Meteorology / v.14, no.4, 2012 , pp. 207-221 More about this Journal
Abstract
Air temperature in Korea has increased by $1.5^{\circ}C$ over the last 100 years, which is nearly twice the global average rate during the same period. Moreover, it is projected that such change in temperature will continue in the 21st century. The objective of this study was to evaluate the potential impacts of future climate change on the rice production and adaptation methods in Korea. Climate data for the baseline (1971~2000) and the three future climate (2011~2040, 2041~2070, and 2071~2100) at fifty six sites in South Korea under IPCC SRES A1B scenario were used as the input to the rice crop model ORYZA2000. Six experimental schemes were carried out to evaluate the combined effects of climatic warming, $CO_2$ fertilization, and cropping season on rice production. We found that the average production in 2071~2100 would decrease by 23%, 27%, and 29% for early, middle, and middle-late rice maturing type, respectively, when cropping seasons were fixed. In contrast, predicted yield reduction was ~0%, 6%, and 7%, for early, middle, and middle-late rice maturing type, respectively, when cropping seasons were changed. Analysis of variation suggested that climatic warming, $CO_2$ fertilization, cropping season, and rice maturing type contributed 60, 10, 12, and 2% of rice yield, respectively. In addition, regression analysis suggested 14~46 and 53~86% of variations in rice yield were explained by grain number and filled grain ratio, respectively, when cropping season was fixed. On the other hand, 46~78 and 22~53% of variations were explained respectively with changing cropping season. It was projected that sterility caused by high temperature would have no effect on rice yield. As a result, rice yield reduction in the future climate in Korea would resulted from low filled grain ratio due to high growing temperature during grain-filling period because the $CO_2$ fertilization was insufficient to negate the negative effect of climatic warming. However, adjusting cropping seasons to future climate change may alleviate the rice production reduction by minimizing negative effect of climatic warming without altering positive effect of $CO_2$ fertilization, which improves weather condition during the grain-filling period.
Keywords
Rice; Climate change; Yield; Warming; $CO_2$ fertilization; Cropping season;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
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