广东省地处低纬,南临南海,北依南岭南坡,位于中亚热带南部至热带北部。热量资源、雨量资源都极为丰富,是我国著名双季稻产区之一。但产量很不稳定。究其原因主要是受季风影响,雨季雨量变化大,特别是早、晚稻抽穗扬花至灌浆结实期前后的5—6月和9月下旬至10月下旬雨量变化大而引起早、晚稻产量的波动。参照国内外有关研究报道,及据我们计算的结果,可以认为,在季风热带和亚热带地区,引起水稻产量波动的气候原因是降水的变化,越往南,其影响越突出。 Guangdong Province is located at low latitude, south of the South China Sea, south of the southern slope of Nanling, located in the southern subtropics to the tropical north. Thermal resources, rainfall resources are extremely rich, is one of China’s famous double cropping rice producing areas. But the output is very unstable. The main reason is due to monsoon, rainy season rainfall changes, especially the early and late rice heading and flowering to grain filling period before and after 5-6 months and late September to late October rainfall changes caused by early and late rice production fluctuations . With reference to the research reports at home and abroad, and based on our calculations, we can conclude that the climatic reason for fluctuations in rice production in the monsoon tropical and subtropical regions is the change in precipitation. The more southward the impact is, the more prominent it is.