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北方园艺  2014 

种植密度对蓝蓟光合特性和产量的影响

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Keywords: 蓝蓟,密度,光合特性,产量,影响

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Abstract:

以蓝蓟为试材,采用裂区试验设计,以种植行距(30、60cm)为主区,株距(10、15、20、25、30cm)为裂区,研究了大田环境下不同种植密度对蓝蓟光合特性和产量的影响。结果表明在行距30cm、株距25cm(T4)和行距60cm、株距20cm(S3)情况下,蓝蓟各光合特性指标数值相互接近;随着株距的增高,光合指标增长缓慢,随着冠层的增高,光合速率呈增长趋势,T4和S3二者群体叶面积指数相似,S3时叶面积指数(LAI)小高峰出现于鼓粒期(9月7日),晚于T4时的盛花期(7月27日);随着密度的增加,百粒重和单株籽粒数逐渐降低,产量总体逐渐减少(T5(行株距30、30cm)、S4(行株距60、25cm)、S5(行株距60、30cm)除外);T4和S3处理产量显著高于其它株距配置,表明高产最终取得的是群体产量的提高,而不仅是单株个体产量的增加,产量随种植密度增加到一定程度后不再增加,说明T4和S3是蓝蓟合理的栽培密度。

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