郑州市作物需水量变化特征研究

Study on Variation Characteristics of Crop Water Requirement in Zhengzhou City

作物需水量是灌溉决策和水资源规划的重要依据,研究其变化特征对农业用水的正确决策具有重要意义。基于郑州市1955-2009年逐日气象资料,采用Mann-Kendall趋势分析法和R/S(重标极差)分析法对主要作物需水量的变化特征进行了研究。结果表明:夏玉米和冬小麦作物需水量均呈明显降低趋势。夏玉米需水主要影响因子为日照时数和风速;冬小麦的主要影响因子为日照时数、风速和平均温度。另外,夏玉米和冬小麦作物需水量均存在着分形特征和长程相关性。

Study on the variation characteristics of crop water requirement is important for irrigation scheduling,water resources planning and future decision-making.In this paper,the Mann-Kendall trend and Rescaled Range Analysis（R/S） method are adopted to study the variation characteristics of the main crop water requirement base on the daily meteorological data from 1955 to 2009 in Zhengzhou City.The results show that the water requirement of the summer maize and the winter wheat shows down trend.The main affecting factors of the water requirement of the summer maize water are sunshine hours and wind speed,while the influencing factors of winter wheat are sunshine hours,wind speed and average temperature.In addition,the water requirement of the summer maize and the winter wheat has fractal property and long-range correlation.