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夏玉米高产群体呼吸速率随着植株的生长发育逐渐增强,开花期达最大值,乳熟后急剧下降.高密度处理的群体呼吸速率大于低密度处理.叶面积大小是影响玉米群体呼吸速率的重要因素,随着叶面积指数的增加(5以下),群体呼吸速率不断增强,其后趋于相对稳定.单位干重的呼吸速率生长早期较高,尔后逐渐下降,至成熟时最低.群体呼吸占总光合的值因生育时期而异,供试品种三年全生育期总平均为30.64%.
The respiration rate of high-yielding population of summer maize increased gradually with the growth and development of the plant, reaching the maximum during flowering stage, dropping sharply after milk ripening.The respiration rate of high density treatment group was higher than that of low density treatment.The leaf area size was important to affect respiration rate of maize population The respiration rate of the population tended to be relatively stable with the increase of the leaf area index (below 5), and the respiration rate per unit dry weight was higher at early growth stage and then gradually decreased to the lowest at maturity. The total photosynthetic values vary with the growth period, the test three years the total growth period average of 30.64%.