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Projection of Consumptive Use and Irrigation Water for Major Upland Crops using Soil Moisture Model under Climate Change

토양수분모형을 이용한 미래 주요 밭작물 소비수량 및 관개용수량 전망

  • Nam, Won Ho (School of Natural Resources, University of Nebraska-Lincoln) ;
  • Hong, Eun Mi (Research Institute for Agriculture & Life Sciences, Seoul National University) ;
  • Jang, Min Won (Department of Agricultural Engineering and Institute of Agriculture & Life Science, Gyeongsang National University) ;
  • Choi, Jin Yong (Department of Rural Systems Engineering and Research Institute for Agriculture & Life Sciences, Seoul National University)
  • Received : 2014.08.08
  • Accepted : 2014.09.22
  • Published : 2014.09.30

Abstract

The impacts of climate change on upland crops is great significance for water resource planning, estimating crop water demand and irrigation scheduling. The objective of this study is to predict upland crop evapotranspiration, effective rainfall and net irrigation requirement for upland under climate change, and changes in the temporal trends in South Korea. The changes in consumptive use and net irrigation requirement in the six upland crops, such as Soybeans, Maize, Potatoes, Red Peppers, Chinese Cabbage (spring and fall) were determined based on the soil moisture model using historical meteorological data and climate change data from the representative concentration pathway (RCP) scenarios. The results of this study showed that the average annual upland crop evapotranspiration and net irrigation requirement during the growing period for upland crops would increase persistently in the future, and were projected to increase more in RCP 8.5 than those in RCP 4.5 scenario, while effective rainfall decreased. This study is significant, as it provides baseline information on future plan of water resources management for upland crops related to climate variability and change.

Acknowledgement

Supported by : 한국연구재단

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