Bougainvillea spectabilis Willd was introduced from South America. The factors of flower falling were studied in Xianning area under the conditions of different light temperature and moisture. The results showed that the plant was forced to be dormant by low temperature. The flowers fell off abnormally for inadequate sunshine and withered early for too much soil moisture in non-dormant period. The flowers were not sensitive to sunshine and withered later under the condition of low temperature or low soil moisture in dormant period.%原产南美洲的三角梅(Bougainvillea spectabilis Willd)花繁叶茂,受到人们的普遍喜爱而频繁引种研究.试验把在南方盛开的三角梅盆花带到冬季的咸宁,置于不同的气温、不同光照、不同水分条件下进行相对比较分析.结果发现,三角梅盆花因温度降低到一定程度而进入被迫休眠状态;在非休眠期,三角梅因光照不足出现非正常落花,加上水分充足而花朵早谢;在体眠状态的三角梅对光照强弱不敏感,但因温度低而显寿命长,因水分少也显寿命长.
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