Climate change and its impacts on summer maize yield in Wugong region
DING Hao, WANG Zhi-Nong, SHANG Hu-Jun, ZHANG You-Gong
(1.College of Water Resources and Architectural Engineering, Northwest A＆F University, Yangling, Shaanxi 712100, China; 2.Baojixia
Irrigation Management Bureau of Drawing Weihe River, Xianyang, Shaanxi 712000, China)
Abstract Based on the monthly weather data and summer maize yield data in Wugong station from 1935 to 2010, applying the MannKendall method, straight line slipping average simulating method and path analysis method, the changing characteristics of each meteorological factor, and the impacts of climate changes on the summer maize yield in Wugong region were analyzed. The results showed that: the lowest temperatures have an increasing trend; wind speed and hours of sunshine have been decreasing gradually and have reached an extremely remarkable level; in summer maize growth period, the lowest temperatures and relative humidity have been trending upwards; the highest temperatures, hours of sunshine and wind speeds have been trending downwards and have reached an extremely remarkable level. Their changing rates are 0116 ℃／10a，0006／10a，-0158 ℃／10a，-26707 h／10a and-0063 m／(s·10a),respectively. SPI is diminishing and the climate is gradually evolving into drought; in summer maize growth period, each meteorological factor, together with other meteorological factors, can affect individual summer maize yield and hours of sunshine has the most influential effect on comprehensive summer maize yield, the decisionmaking coefficient being 2309％; decreasing precipitation trend is the major restrictive meteorological factor in increasing summer maize yield, the decisionmaking coefficient being-673％. The negative impacts of climate changes on summer maize yield in Wugong region can be mitigated to some extent by technological innovations and other measures.
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