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应用作物产量分析源库性能模式分析棉花受旱减产的原因，结果表明，盛花期胁迫减产最重，其次盛蕾初花期、盛铃始絮期相对较轻。受旱后棉株光合产物向棉铃中分配比例有所增加，减产主要是生物产量降低所致。生育时期不同，棉花光合性能、产量构成各因素对水分胁迫的反应及其对产量形成的影响不同，导致棉花不同时期受旱减产的程度和原因有所不同
The reason of cotton drought-reduced yield was analyzed by using the source-sink performance model of crop yield analysis. The results showed that the maximum yield reduction was at full-flowering stage, followed by the flowering stage of Sheng-Lei and the relatively low initial-stage florescence. After drought, the distribution proportion of photosynthate to cotton bolls in cotton plants increased, the decrease was mainly due to the decrease of biological yield. Different growth stages, cotton photosynthetic performance, yield components of the response to water stress and its impact on yield formation, resulting in different periods of drought cotton yield and the reasons for the different