关键词: 棉花, 棉花, 诱导长柱头, 杂交制种, 采粉器, 授粉器

Abstract: The paper aims to study the influence of ecological environment change at Shiyang river basin on main meteorological disasters, based on the number of days of main meteorological disasters recorded by 5 weather stations from 1987 to 2016 at Shiyang river basin, and using time series trend analysis and various statistical analysis method of the mutation detection. The results showed that: since the beginning of the comprehensive control at Shiyang river basin, the meteorological disasters had an obviously decreasing trend, and obvious differences from the three periods of the first 10 years, middle 10 years and last 10 years; the number of drought days increased for the beginning 20 years and reduced for the last 10 years; hail, gale, fly ash, sand blowing and sand storm all reduced evidently, especially for the gale and sand blowing; atmospheric dust fall also declined each year since 2010, and acid rain vanished since 2011. As the comprehensive control at Shiyang river basin continues, the groundwater depth has risen again, soil moisture has increased, vegetation coverage area has expanded, the ecological environment has obvious improvement and the meteorological disasters have decreased significantly.