Spatial and Temporal Changes of Soybean Water Requirment during Recent 30 Rears in Northeast Inner Mongolia
This study was based on observed daily meteorological data of 12 meteorological stations during recent 30 years in northeast Inner Mongolia from 1991 to 2020,analyzed the spatio-temporal characteristics of the effective precipitation,water requirement(ETc)and climate trend rate in different growth periods of soybean.The results showed that the effective precipitation manifest decreased first and then increased trend from south to north in northeast Inner Mongolia,the climate tendency rate of effective precipitation showed a decreasing trend.The high value area was concentrated in the eastern part of Hulun Buir;The distribution trend of effective precipitation increased in early,middle,and late stages of soybean growth.The proportion of effective precipitation in middle growth period was the highest,account for 65％of the average effective precipitation.The regional characteristics of water requirement(ETc)were obvious,decreased from south to north,increased from west to east.The high value area was concentrated in the southern Xing'an League of Tuquan County and Horqin Right Wing Middle Banner,in each growth stage the water requirement of soybean was concentrated in the southern Xing'an League of Horqin Right Wing Middle Banner,Tuquan County,Horqin Right Wing Front Banner and Ulan Hot City.In general,the main soybean producing areas in northeastern Inner Mongolia had low precipitation and high water requirement.Effective precipitation fails to meet soybean demand and was prone to meteorological disasters such as drought.Therefore,irrigation should be appropriately increased in production to ensure stable and high soybean yields.
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