旱灾是指土壤水分不足,不能满足牧草等农作物生长的需要,造成较大的减产或绝产的灾害。旱灾是普遍性的自然灾害,不仅农业受灾,严重的还影响到工业生产、城市供水和生态环境。中国通常将农作物生长期内因缺水而影响正常生长称为受旱,受旱减产三成以上称为成灾。经常发生旱灾的地区称为易旱地区。 Drought is the lack of soil moisture, can not meet the needs of the growth of crops such as forage, resulting in greater reduction of production or abortion disaster. Droughts are a universal natural disaster that not only affected agriculture but also severely affected industrial production, urban water supply and the ecological environment. In China, the normal growth due to lack of water during the crop growth period is usually called drought. More than 30% of drought-affected crops are called disaster. Areas where drought often occurs are called drought-prone areas.