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Variation research of coffea arabica water requirement at different temporal scale in Yuanmou Irrigation District |
Fu Na, Liu Xiaogang, Li Chuang, Wan Mengdan, Wang Lu, Yang Qiliang |
Faculty of Modern Agricultural Engineering, Kunming University of Science and Technology, Kunming, Yunnan 650500, China |
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Abstract The analysis of water requirement regulation for coffea arabica at different temporal scale can provide a basis for optimal water management. Based on the daily meteorological observation data in Yuanmou during 1955—2010, coffea arabica water requirement and crop water surplus deficit index were estimated, and the variation characteristics were analyzed at different temporal scale. The impact of several meteorological factors on water requirement was studied by the partial correlation analysis method. The variation pattern was conducted on the data of the annual water requirement and crop water surplus deficit index by using the Mann-Kendall test and moving t-test. The result showed that the curve of water requirement had a single peak parabolic shape within a year, and the maximum va-lue of water deficit was delete March to May while the minimum from June to October. Coffea arabica water requirement was fluctuant decrease in recent 55 years. Since the 1980s, water requirement and water deficit began to decrease significantly. The changes of coffea arabica water requirement were primarily attributed to wind speed and sunshine duration in Yuanmou Irrigation District.
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Received: 23 September 2014
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