不同水文年型北方春玉米需水量时空变化特征研究

Temporal and Spatial Variations of Water Requirements of Spring Maize under Different Hydrological Years in the North of China

在北方春玉米详细分区的基础上，研究了不同水文年型春玉米典型站点年内、年际需水量的变化与整个北方春玉米区春玉米需水量的空间分布以及不同水文年型春玉米需水量与降雨量的相关性。结果表明．时间尺度上．典型站点不同水文年型年内眷玉米需水量变化较大，年内最大、最小旬需水量相差20-30mm．年际间最大相差50-70mm。空间分布上，不同水文年型同一地区春玉米需水量变化趋势一致，但整个北方春播玉米区春玉米需水量相差500-600mm。降雨量与春玉米需水量极显著相关，相关系数在0．945-O．998之间。

Based on detailed partition of north spring maize, the change characteristics of spring maize water requirements in typical websites, spatial distribution of spring maize water requirements in the entire north area and the correlation between water requirements of spring maize and rainfall in different hydrological years were studied. The results showed that water requirements of spring maize in typical websites changed largely in different hydrological years, the differences between maximum and minimum water requirements per ten days ranged from 20 mm to 30 mm while the yearly differences changed from 50 mm to 70 mm on time scales. In spatial distribution, spring maize water requirements changed similarly in the same area under different hydrological years, but the differences of spring maize water requirements was from 500 mm to 600 mm in the entire north area. The correlation between spring maize water requirement and rainfall was extremely significant and its correlation coefficient changed from 0. 945 to 0. 998.