种植密度与施氮量对烤烟光合特性及代谢酶活性的影响
Effects of Planting Density and Nitrogen Application on the Photosynthetic Characteristics and Metabolic Enzyme Activities of Flue-Cured Tobacco
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摘要: 采用田间裂区试验，研究3种种植密度（主处理）与3个氮水平（副处理）对烤烟产量、光合特性及代谢酶活性的影响.结果表明：1）种植密度与施氮量对地上部生长具有正交互作用.2）种植密度、施氮量、种植密度×施氮量对叶绿素a、叶绿素b和类胡萝卜素含量无显著影响.高密度与中密度处理叶片光合速率之间无显著差异，两者均显著高于低密度处理；高密度时光合速率在高氮时高于中、低氮处理；中密度时光合速率在中氮时与低、高氮时均无显著差异，高氮时显著高于中氮时；低密度时光合速率在高氮时低于低氮时，中氮处理与低、高氮处理均无显著性差异.3）种植密度与施氮量互作对旺长期和成熟期叶片硝酸还原酶活性、淀粉酶活性具有调控作用.Abstract: A field experiment was carried out to investigate the effects of planting density and N application on the yield, photosynthetic characteristics and enzyme activities of tobacco. The results showed that: 1) Planting density and N had a positive interaction with shoot biomass; 2) Planting density, N and planting density×N had no effects on chlorophyll a,chlorophyll b and carotenoids content. Photosynthetic rate had no difference between high and medium density, which was higher than that of low density. Under the condition of high density, the photosynthetic rate of high N was higher than that of medium and low N treatment. Under the condition of medium density, photosynthetic rate at medium N had no difference compared with that at either low or high N. Photosynthetic rate at high N was higher than that at medium N, and photosynthetic rate at low N had no difference with that at medium or high N. Under the condition of low density, photosynthetic rate at high N was lower than that at low N, but photosynthetic rate at medium N had no difference compared with that at either low or high N; 3) Planting density and N had a significant impact on nitrate reductase activities and amylase activities at growing and maturing stages.
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