涝渍胁迫与大气温、湿度对棉花产量的影响分析

Effects of waterlogging stress with air temperature and humidity on cotton yield

在多雨湿润地区,涝渍胁迫与大气温、湿度共同影响作物。研究发现:作物相对产量与涝渍胁迫指标和降渍过程的大气温、湿度指标之间有密切的相关关系,其中,涝对作物的影响是第一位的;作物关键生育期受单过程涝渍胁迫时,涝后10 d内不出现高温,渍对作物的影响居第二位,出现高温天气(日最高气温不低于35℃),则渍的影响小于高温天气的影响;在多个涝渍过程连续发生的条件下,涝后10 d内日最高气温≥35℃的天数对产量的影响大于地下水埋深小于80 cm的累积作用时间对产量的影响。

In rainy and humid regions, waterlogging stress with air temperature and humidity affects crop growth. Experimental study show that： a） there is a close correlation between relative yield of cotton and many factors such as waterlogging stress, air temperature and humidity when the groundwater table descending down from the land surface to a certain level. Among the influential factors the waterlogging stress ranked the first place; b） when cotton plants at a critical phase suffered one process of the waterlogging stress, the influence of subsurface waterlogging on the crop took the second place among the influential factors when the daily temperature was normal, however, in case of daily maximum temperature no less than 35℃ within ten days after surface waterlogging, the influence of subsurface waterlogging on the crop was less than that of high temperature weather on it; c） in the case of multiple waterlogged process taking place one by one, the influence upon the crop yield from the continuous days that daily maximum temperature was no less than 35℃ within ten days after surface waterlogging was greater than that from the continuous days of groundwater depth less than 80 cm.