干旱对天水市冬小麦生产的影响研究

Study on Effect of Drought on Winter Wheat Production in Tianshui City

采用多因子组合的统计方法,对天水干旱的发生规律和干旱成因进行了研究。结果表明,小麦产量形成关键期仲春土壤干旱、春末大气干旱和初夏土壤干旱对小麦危害最重;小麦播前8～9月和来年冬麦返青至起身期3月大气干旱也可导致小麦减产。

Occurrence regularity and cause of drought in Tianshui City were studied with multiple factors combination statisticaimethod. The resuits showed that the damage of soil drought in mid-spring,atmosphere drought in late-spring and soil drought in early-su tamer during the key period of wheat yield formation were the most serious. Atmosphere drought from August to September before sowing of wheat and the drought in March （from turning green stage to jointing stage of winter wheat） in the second year also could lead to wheat yield reduction.