%A TONG Changfu*, LI Heping, HU Cuiyan, ZHANG Na, BAI Lifang, BAI Rujun, LI XiaoliŠĪ %T Temporal and spatial variation of reference crop evapotranspiration in Inner Mongolia %0 Journal Article %D 2018 %J Journal of Drainage and Irrigation Machinery Engin %R 10.3969/j.issn.1674-8530.18.1139 %P 1071-1075 %V 36 %N 11 %U {http://zzs.ujs.edu.cn/pgjx/CN/abstract/article_2557.shtml} %8 2018-11-25 %X 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.ŠĪ