关键词: 玉米, 玉米, 冷害, 生理, 光合作用, 遗传

Abstract: The paper aims to reveal the characteristics of main meteorological disasters in the hilly loess plateau in the context of global climate change, based on daily precipitation data of 12 weather stations from 1971 to 2010 in the hilly loess plateau, the authors analyzed the temporal and spatial distribution characteristics and change regulations of the main meteorological disasters, such as jujube florescence rain, drought in fruit growth period, and the mature period overcast and rainy in the hilly area of loess plateau during the nearly 40 years. The results indicated that the jujube florescence rain and fruit growth period drought showed an increasing trend, and the mature period overcast and rain showed a decreasing trend. The decadal variability of each disaster was relatively stable. The distribution of prone areas of the main meteorological disasters had obvious regional characteristics. The occurrence rate of florescence rain in mid- east and southwest part of the study area was higher than that in other regions. The frequency of the young fruit arid in the west bank of the Yellow River was higher. The mature period overcast and rain in the south was more serious than that in the north.