近50 a滹沱河平原冬小麦灌溉需水时空特征研究

Study on Temporal and Spatial Characteristics of Wheat Maize in Hutuo Plain from 1961 to 2010

应用彭曼公式、反距离权重插值(IDW)及相关分析等方法,研究了气候变化对滹沱河平原冬小麦灌溉需水量时空变化的影响,主要得出以下几点结论:(1)近50a来滹沱河平原冬小麦灌溉需水量以18.5 mm/10 a的速率呈显著下降趋势(P<0.01);(2)在空间特征上,冬小麦需水量以藁城、赵县和宁晋一线为界,分界线以东需水量在500~530 mm,分界线以西在530~600 mm;(3)降水量是冬小麦需水量变化的主控因素,降水量每增大100 mm,需水量将减少124 mm,日照时数和近地风速显著下降是造成该区需水量下降的主要原因。

In this paper,we studied the temporal and spatial characteristics of wheat maize subject to climate change in Hutuo plain through the methods of penmen equation,IDW and correlation analysis.The results as follows:from 1961 to2010,the irrigation water requirement(IWR)of wheat maize of Hufu plain showed an obviously declined tendency(P<0.01),and the rates of decrease was 18.5 mm/10 year;there is an apparent divided boundary in Hufu plain for IWR of wheat maize,which was Gaocheng,Zhaoxian and Ningjin,in the east of the divided boundary,the IWR was 500~530 mm,and the west of the divided boundary was 530~600 mm;Precipitation is the driving factor of the IWR variation,and an increase of 100 mmfor precipitation,the IWR will decrease 124 mm. sunshine duration and the wind speed significantly decline was the main reason for IWR decrease.