种植密度和留叶数对彭水山地烟叶光合特性的影响

Effects of Plant Density and Remained Leaf Number on Photosynthetic Characteristics of Flue-cured Tobacco in Pengshui

为了解彭水山地烟叶的光合特性,设置种植密度和留叶数2个试验因素,以烤烟(Nicotiana tobacum L.)品种云烟97为材料,于2012年研究了不同栽培技术对烤烟烟叶光合特性的影响。结果表明:在A1B1(种植密度为13 500株/hm2、留叶数14片/株)处理下,净光合速率、气孔导度、蒸腾速率等均处于最大值,而胞间CO2浓度在A3B3(种植密度为19 500株/hm2、留叶数22片/株)处理下达到最大值。而气孔导度、胞间CO2浓度、蒸腾速率在A2B1(种植密度为16 500株/hm2、留叶数14片/株)处理下最小。尽管叶绿素相对含量在不同处理下表现出不同的变化,但处理间没有达到显著性差异。经过综合分析,在本试验中,彭水山地烟区的烟叶在A1B1处理即较低种植密度和留叶数下烤烟光合特性表现较好。

In order to understand the photosynthetic characteristics of flue-cured tobacco leaves in Pengshui,a field experiment with two factors （plant density and remained leaf number） was carried out to investigate the effects of different cultivation technique on photosynthetic characteristics of flue-cured tobacco leaves using a tobacco（Nicotiana tobacum L.） cultivar of YunYan 97.The results showed that under A1 B1 （plant density 13500 plant/hm2 and remained leaf number 14 piece/plant） treatments,the net photosynthetic rate（Pn）,stomatal conductance （Gs）,transpiration rates （Tr） got the highest level,while the intercellular CO2concentration （Ci） reached the highest level at A3B3 （plant density 19500 plant/hm2 and remained leaf number 22 piece/plant）treatment.For stomatal conductance （Gs）,intercellular CO2concentration （Ci） and transpiration rates （Tr）,A2B1 （plant density 16500 plant/hm2 and remained leaf number 14 piece/plant）treatment led to the lowest level.Even the relative content of chlorophyll are different from treatments,but did not reached a significant level.In this research,photosynthetic characteristics of flue-cured tobacco leaves in Pengshui under the A1 B1 treatment,i.e.at lower plant density and remained leaf number show better.