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棉花学报  2013 

氮素水平对棉花幼苗生长和光合特性的影响

DOI: 1002-7807(2013)05-0403-07, PP. 403-409

Keywords: 氮素,棉花幼苗,生长,光合特性

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Abstract:

为研究氮素水平对棉花幼苗生长和光合特性的影响,测定了营养液培养下棉苗的生长指标、叶绿素含量及光合作用参数等指标。结果表明棉花幼苗地上部干重、叶绿素a+b、叶绿素a/b、净光合速率、气孔导度、蒸腾速率、PSII的潜在活性、PSII光化学最大效率均随氮浓度的增加呈先升高后降低趋势。棉花幼苗生长的最适宜氮浓度为4mmol·L-1;随处理时间延长,处理间差异先增加后减少,处理第12天时,除根冠比外,各指标均与氮浓度极显著相关;气孔导度和净光合速率对氮素的响应最为灵敏;鲁棉研28各光合指标下降程度大于银瑞361和农大棉8号,3个品种对氮素敏感性依次为鲁棉研28>银瑞361>农大棉8号。

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