不同时期干旱胁迫对棉花生长和产量的影响Ⅰ.棉花受旱减产原因分析

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

Effect of Drought Stress on Growth and Lint Yield of Cotton at Different Growing Stages I.The Causes Analysis of Cotton Yield Reducing Under Drought Stress

The causes of lint yield reducing under water stress was investigated with the viewpoint of the mode of Sourth Sink properties of crop yield analysis .It has been found that the degrees and causes of the reduction vary with the stages in which the water stress was practised.The most serious reduction was at full blossoming stage of the stress,followed by full budding and early blossoming stage,and the less reduction was observed at full bolling and early boll opening stage.The causes of the reducing were possibly low total biomass and not the distribution of dry matter.In addition,the different response of each factor of photosynthetic properties and yield formation to stress led to the different degrees and causes of cotton yield reducing in different growing stage.