福建农业学报2017，Vol.32Issue(3)：253-257,5.DOI:10.19303/j.issn.1008-0384.2017.03.005
种植密度对烟草冠层辐射和群体光合作用的影响
Effect of Planting Density on Light Transmittance and Canopy Photosynthesis of Flue-cured Tobacco Plants
摘要
Abstract
Canopy photosynthetic capacity determines the yield and quality,while planting density affects the growth and canopy development of a flue-cured tobacco plant.Varied planting densities (i.e.,D1at 16 529 plants per hm2,D2 at 18 182 plants per hm2,and D3 at 20 202 plants per hm2) were applied to study their effect on the leaf area index (LAI),light transmittance (LT),photosynthesis,and economy of the canopies on Yunyan 85tobacco plants.The results showed that,during the entire course of canopy development,LAI was at its highest level and the distance between leaf tips of adjacent lines (DLT) and LT at their lowest in the dome stage.As the leaves matured and upon harvest,LAI declined,while DLT and LT increased.Consequently,the canopy photosynthetic rate(RCP) peaked during the dome stage.In comparison,in the same period,an increased planting density would induce a heightened LAI but lowered DLT and LT.On the other hand,the changes of planting density or leaf-harvesting did not significantly affect RCP on the plants.LAI was found inversely correlated to DLT and LT.The correlation between RCP and planting density varied at the dome stage.RCP raised as the density increased from D1 to D2,but decreased from D2 to D3.And,RCP correlated to leaf-removal,but insignificant.RCP could not be continually risen with increasing planting density.In fact,it declined when the density exceeded a certain level.Yield and output on tobacco leaves increased significantly as the planting density increased from D1 to D2,but decreased from D2 to D3.The percentage of high-grade tobacco was maximized with D2 among the 3 treatments.Taking the canopy development,field management and production cost together into consideration,a planting density approximating 18 182 plants per hm2seemed optimal for Yunyan 85 cultivation.关键词
烤烟/密度/群体发育/冠层辐射/群体光合/经济性状Key words
flue-cured tobacco/planting density/canopy development/canopy radiation/canopy photosynthesis/economic factor分类
农业科技引用本文复制引用
许海良,赵会杰,蒲文宣,张锦韬,易克,汪耀富..种植密度对烟草冠层辐射和群体光合作用的影响[J].福建农业学报,2017,32(3):253-257,5.基金项目
湖南中烟工业有限责任公司科技项目 (KY2014JD0002) （KY2014JD0002）
