Temporal and spatial variation of reference crop evapotranspiration in Inner Mongolia
TONG Changfu1*, LI Heping1, HU Cuiyan2, ZHANG Na3, BAI Lifang2, BAI Rujun4, LI Xiaoli4
1.State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, China Institute of Water Resources and Hydropower Research, Beijing 100044, China; 2.Water Conservancy and Water and Soil Conservation Bureau of Etuoke Banner, Erdos, Inner Mongolia 016100, China; 3.Ningxia Institute of Water Resources Research, Yinchuan, Ningxia 750021, China; 4.Water Conservancy and Water and Soil Conservation Bureau of Wushen Banner, Erdos, Inner Mongolia 017300, China
In order to have a thorough understanding of the variation characteristics of reference crop evapotranspiration(ET0)in Inner Mongolia, the Penman-Monteith method recommended by the United Nations Food and Agriculture Organization in 1998, was used to estimate the monthly ET0 at 50 meteorological stations in Inner Mongolia in 1981—2012. Also, the global drought index(UNEP)proposed by the United Nations Convention on Combating Desertification was applied to carry out the climate partitions, and the spatiotemporal variation of ET0 in different climatic zones was analyzed by using spatial interpolation and sliding average method in eight years. Results showed that ET0 variation ranges were 1 401-1 573 mm, 1 145-1 269 mm, 900-1 013 mm, 710-857 mm and 571-735 mm in special arid, arid, semi-arid, arid and humid, moist sub-humid climate zones, respectively, with a less than 200 mm fluctuation amplitude. Additionally, the ET0 value was gradually reduced, i.e. the more humid the climate zone, the smaller the cumulative annual ET0. Based on the dates when the highest and lowest ET0 have occurred, ET0 shows strong randomness.
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