我国油菜主产区大部分分布于长江流域冬油菜区和北方春油菜区。长江中游油菜主产区常常受到秋、冬干旱危害,而长江上游油菜主产区和北方春油菜主产区则常常受到春旱的危害。干旱是限制油菜生产和发展的重要因素之一。近年来随着全球气候变暖,我国长江流域秋旱发生 Most of China’s major rapeseed areas are located in the winter rapeseed area of ​​the Yangtze River Basin and the northern spring rapeseed area. The main areas of rapeseed in the middle reaches of the Yangtze River are often endangered by autumn and winter droughts, while the main producing areas of rape in the upper reaches of the Yangtze River and the main producing areas of spring rape in the north are often endangered by spring droughts. Drought is one of the important factors that limit rapeseed production and development. In recent years, with the global warming, the autumn droughts of the Yangtze River in China occur