论文部分内容阅读
秋封是汉中地区水稻生产中的重要农业气象问题之一,对其产量及全地区粮食总产量都影响很大。所谓“秋封”是指从8月中旬至9月上旬由于立秋后强冷空气活动,致使少数早、中茬口生育期较长的水稻品种和部分晚茬口的水稻品种在幼穗分化期和抽穗杨花期遭受低温危害,出现大量翘穗和空壳,使产量显著下降的现象。七十年代以来,汉中地区先后于1972和76年出现过两次低温。1972年从8月29日至9月7日出现连续10天的日平均气温≤20℃的低温,9月4日曾低到14.4℃,使当年全地区大量水稻秋封,比前一年显
Autumn seal is one of the important agro-meteorological problems in rice production in Hanzhong area, which has a great impact on its output and the total grain output in the whole region. The so-called “autumn seal” refers to the mid-August to early September due to strong cold air after the beginning of the autumn, resulting in a small number of early and middle stubble stubborn longer rice varieties and some late crop varieties of rice in panicle differentiation and heading Poplar suffered low-temperature damage, a large number of Qiao spike and empty shell, so that significantly reduced the phenomenon of production. Since the 1970s, Hanzhong has experienced two low temperatures in 1972 and 76 respectively. From August 29 to September 7, 1972, there appeared a low temperature of 20 ℃ for 10 consecutive days and a low of 14.4 ℃ on September 4 so that a large amount of rice was sealed in the whole area in that year,