In order to realize scientific irrigation of winter wheat in Jiangsu Province,improve the efficiency of agricultural water use,clarify the spatial and temporal characteristics of winter wheat water demand and climatic influences in Jiangsu Province,and provide scientific and technological support for the province's irrigation management of winter wheat and the efficient use of agricultural water resources,this paper utilized the meteorological data related to the 2013-2022 winter wheat season in a total of 12 areas in Jiangsu Province.The water demand of winter wheat in Jiangsu Province in the past decade was calculated by the Penman-Montieth method.The spatial and temporal changes in the water demand of winter wheat in Jiangsu Province in the past decade were analyzed by the Pearson correlation analysis method,as were the characteristics of the water demand and the meteorological factors affecting the winter wheat in Jiangsu Province.During the past ten years,average annual temperature,average daily humidity,surface temperature,precipitation,evaporation,and average sunshine hours in Jiangsu Province have all shown a general upward trend,and total solar radiation has shown a decreasing trend.The average value of winter wheat water demand in Jiangsu Province is 451.82～692.50 mm,and the province's winter wheat water demand shows a decreasing trend in different years of the present field period,with an inter-annual variation range of 540.19～646.70 mm,and the province's wheat water demand shows a decreasing trend from northwest to southeast.In most areas of Jiangsu Province,the minimum winter wheat water demand intensity occurs in January,and the maximum water demand intensity occurs in May-June during the tasseling period and grouting period.Winter wheat water demand in Jiangsu Province exhibits a negative correlation with average annual rainfall and average daily humidity,and a positive correlation with average annual water surface evaporation,average annual sunshine hours and average annual air temperature in Jiangsu Province.Among these factors,average daily humidity,average annual water surface evaporation and average annual air temperature have the most obvious influence on winter wheat water demand.Moreover,the overall slightly decreasing trend of winter wheat water demand during the whole reproductive period in the last decade may be due to its significantly higher negative correlation with mean daily humidity.In conclusion,in the past ten years,winter wheat water demand in Jiangsu Province has a decreasing trend year by year,and decreasing from northwest to southeast,and the province's average daily humidity,average annual evapotranspiration from the water surface,the average annual temperature is the main influencing factor of the change of winter wheat water demand in recent years.
Jiangsu Provincewinter wheatcrop water requirementwater requirement characteristicsspatial and temporal distributionmeteorological factors
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万方数据
