论文部分内容阅读
基于河东地区冬小麦、春小麦各5个站近50年气象资料,利用FAO推荐的Penman-Monteith公式,得到河东地区近50年来冬、春小麦全生育期的需水量和缺水量,并用Mann-Kendall法分析其变化趋势,利用相关分析法得到影响小麦需水量变化的主要气象因子。结果表明:环县冬小麦需水量呈略微减少趋势,崆峒、天水、武都、西峰冬小麦需水量呈增加趋势;景泰春小麦需水量呈显著减少趋势,临洮、临夏、岷县、榆中4站春小麦需水量呈增加趋势;冬小麦缺水量均呈增加趋势,增加幅度在7.32~25.19 mm·10 a-1;景泰春小麦缺水量为下降趋势,减小幅度为20.81 mm·10 a-1,其他4站缺水量为增加趋势,幅度在0.42~20.4 mm·10 a-1;对冬小麦需水量影响最大的气象因子是日平均温度、风速;对春小麦需水量影响最大的气象因子是日平均温度、相对湿度和风速。
Based on the past 50 years’ meteorological data of five stations of winter wheat and spring wheat in Hedong area, the Penman-Monteith formula recommended by FAO was used to obtain the water requirement and water deficit during the whole growth period of winter and spring wheat in Hedong area. The Mann-Kendall method Analyze its changing trend, and use correlation analysis to get the main meteorological factors that affect the change of water requirement of wheat. The results showed that the water requirement of winter wheat in Huanxian showed a slight decreasing trend, and the water requirement of winter wheat in Qionglai, Tianshui, Wudu and Xifeng showed an increasing trend. The water requirement of Jingtai spring wheat decreased significantly, and the spring wheat in Lintao, Linxia, Minxian and Yuzhong Water deficit increased with the increasing trend of 7.32 ~ 25.19 mm · 10 a-1. The water deficit of Jingtai Spring decreased with the decrease of 20.81 mm · 10 a-1 and the others The station 4 has an increasing trend of water deficit, ranging from 0.42 to 20.4 mm · 10 a-1. The meteorological factor that has the greatest impact on winter wheat water requirement is the daily average temperature and wind speed. The meteorological factor that affects spring wheat water demand is the daily average temperature , Relative humidity and wind speed.