中文摘要：

【目的】为采取适宜栽培措施减轻花铃期不适宜温光条件对棉花纤维品质的影响提供理论依据。【方法】以温度敏感性差异较大的科棉1号（低温弱敏感型品种）和苏棉15号（低温敏感型品种）为材料,通过分期（4月25日、5月25日、6月10日）播种和花铃期遮阴（相对光照率CRLR为100%、80%、60%）,形成花铃期不同的温光条件,研究温光互作（用铃期内累积辐热积PTP表示）对棉花不同空间部位纤维品质的影响。【结果】（1）铃期内日均温、日均最高温、日均最低温和光合有效辐射是造成棉纤维品质差异的主要气象因子,棉株不同空间部位各气象因子值纵向随果枝数增加、横向随果节数增加均逐渐降低。（2）纤维品质指标中马克隆值对温光互作最为敏感,其次为纤维比强度、纤维长度。（3）各空间部位棉纤维长度、比强度、马克隆值随铃期内PTP的增加均呈抛物线型变化。各空间部位各纤维品质指标理论最大值,纵向比较内围果节以中部果枝最大,下部次之,上部最小,横向外围果节的理论最大值均小于其内围果节。中部内围铃各纤维品质指标达到优质棉A级、AA级时适宜PTP范围最广。低温敏感型品种各纤维品质指标适宜PTP范围皆低于低温弱敏感型品种。（4）纤维比强度的适宜PTP范围较小,是优质棉A级的主要限制因素;马克隆值和比强度适宜PTP匹配性差,是优质棉AA级的共同限制因素。棉纤维品质在PTP 183.5—633.7 MJ.m^-2（科棉1号）、229.0—589.6 MJ.m^-2（苏棉15号）时达到优质棉A级,在304.7—452.9 MJ.m^-2（科棉1号）、346.6—357.8 MJ.m^-2（苏棉15号）时达到优质棉AA级,两年试验中除6月10日播期CRLR60%处理外其余处理均达到优质棉A级;而达到优质棉AA级的只有4月25日播期CRLR80%、CRLR60%处理和5月25日播期CRLR80%处理。【结论】棉花各纤维品质指标均有其适宜的PTP范围,纤维比?

英文摘要：

【Objective】The objective of this study is to provide a theoretical basis for taking suitable cultivation measures to reduce the decrease extent of fiber quality caused by inappropriate temperature and solar radiation during flowering and boll-forming stage.【Method】The field experiment was carried out in Nanjing with two cotton cultivars（temperature-insensitive cultivar Kemian1 and temperature-sensitive cultivar Sumian 15）. Three sowing dates（25-Apr, 25-May and 10-Jun） and three relative light rates（CRLR100%, 80%, and 60%） were set, thus cotton fiber development and the quality formation can be arranged at different temperature-light（PTP） conditions and different fruiting branch positions.【Result】During the flowering and boll-forming stages,difference in cotton fiber quality was mainly caused by mean daily temperature, mean daily maximum temperature, mean daily minimum temperature and photosynthetic active radiation, which were all reduced with the increase of fruiting branch or fruiting position. Micronaire was the most sensitive fiber quality index to the change of meteorological conditions, followed by fiber strength and fiber length. Cotton fiber length, strength and micronaire were quadratic with PTP. The theoretical maximum value of fiber quality at the 1st and 2nd fruiting positions was highest on the middle fruiting branches（6th to 8th node）, followed by the low fruiting branches（2nd to 4th node） and the upper fruiting branches（10th to 12 th node）; and they were higher than those at the 3rd or greater fruiting positions. Range of optimum PTP for greater fiber quality（reach A grade and AA grade） was broader on the 1st and2 nd fruiting positions of the 6th to 8th fruiting branches. And the range of optimum PTP for fiber quality of temperature-sensitive cultivar was smaller than temperature-insensitive cultivar. Fiber strength was the main restrictive factor to achieving fiber quality with A grade for a smaller range of optimum PTP. Fiber strength and micronaire wer