中文摘要：

以科棉1号和美棉33B为材料,以江苏南京（118°50′E,32°02′N,长江流域下游棉区）和河南安阳（114°13′E,36°04′N,黄河流域黄淮棉区）为生态试点,研究种植密度对棉纤维品质形成的影响。结果表明,纤维长度、成熟度和马克隆值随花后天数的累积动态以及对密度的响应趋势基本一致,且均与种植密度呈极显著负相关关系;而纤维细度随花后天数的增加逐渐减小,且与种植密度呈正相关关系;随种植密度的增大,两个供试品种的纤维比强度均呈开口向下的抛物线变化趋势,南京试点和安阳试点分别以3.3万株/hm2和5.1万株/hm2密度处理的纤维比强度为最高;过低和过高密度均不利于高强纤维的形成,高密度尤其不利;品种、生态试点和开花期对棉纤维品质的形成动态及其对种植密度的响应趋势没有明显影响;种植密度对棉纤维品质的影响与群体冠层光照条件变化密切相关;适宜的种植密度最有利于纤维品质的提高。

英文摘要：

The experiment materials kemianl and Meimian 33B,Jangsu Nanjin（118°50′E,32°02′Yangtze river cotton area）and Henan Anyang（114°13′E,36°04′N,Yellow river cotton area）as eco pilot Effects of different plant population densities on the formation of cotton fiber quality were studied.Fiber length,fiber maturity and fiber micronarie with the cumulative dynamic of days post anthesis and the cotton planting population of the dynamic response of the trend was basically consistent and both showed highly significant negative correlation.Fiber fineness increased with days post anthesis decreased gradually acquired,and with a positive correlation between cotton planting population.With the increase of cotton planting population,the two varieties of fiber strength changed according to a parabolic curve.The highest fiber strength was obtained at 3.3×105plants ha-1 in Nanjing and 5.1×105plants ha-1 in Anyang,respectively.The too low or too high density was not conducive to the formation of high-strength fiber.High density is particularly vulnerable.Variety,site,and flowering period had no significant effect on the trends of fiber quality formation and response to cotton planting population. It was most favorable to improve the fiber quality that suitable cotton planting population.The impacts of cotton planting population on fiber quality were closely related in canopy light conditions.