Variation Characteristics on Water Requirement of Main Crops in Huaihe River with Climatic Changes
According to the monthly meteorological data from 1962 to 2011,the average annual ET0 and crop water requriement of winter wheat,summer maize and rice were calculated and analyzed in Huaihe river basin using Penman-Monteith formula and single crop coefficient approach assuming that temperature increased by 1～3 ℃,and their variation characteristics were also discussed.The results showed that the average annual ET0 in the different areas reduced with the temperature rising.When the temperature increased by 3 ℃,the average annual ET0 in the Huaihe river basin would increase largely,which was much higher than those of temperature increasing by 1～ 2 ℃.Crop water requirement was more sensitive in some regions such as Xinyang,Bengbu,Xuzhou,but it was not sensitive to the temperature response in other areas,such as the coastal river of Shandong peninsula,Yishusi river and the downstream of Huaihe river (down outlet of Hongzehu) when the temperature increased by 2～3 ℃.Variation characteristics of summer maize and winter wheat were similar under the same situation.The increment of rice water requirement was much higher than ones of winter wheat and summer maize when the temperature increased by3 ℃.
climatic changethe average annual ET0crop water requiriementthe Huaihe river basinvariation characteristic
国家科技期刊平台
NSTL
万方数据
维普
