核农学报2024，Vol.38Issue(5)：993-1003,11.DOI:10.11869/j.issn.1000-8551.2024.05.0993
黔南山地烤烟合理群体结构的光合机制研究
Photosynthetic Mechanism of Reasonable Population Structure of Flue-Cured Tobacco in Southern Guizhou Mountainous Area
摘要
Abstract
This experiment utilized a split-plot design with row spacing as the main plots(R1:100 cm,R2:110 cm)and planting density as the sub-plots(D1:15 000 plants·hm-2,D2:18 000 plants·hm-2,D3:21 000 plants·hm-2)to investigate the photosynthetic response mechanism of flue-cured tobacco under different population structures,and to explore the most appropriate flue-cured tobacco population structure for the mountainous region of southern Guizhou.The findings demonstrated that the leaf area index(LAI)of the flue-cured tobacco population was significantly higher with R2 row spacing when compared to R1,and the population's LAI increased initially before decreasing as density increased.The leaf orientation value of the middle leaf significantly increases with the increase in row spacing and density,whereas the lower leaf shows an opposite trend.The leaf orientation values of the upper and middle R2D2 and R2D3 treatments and the lower R1D2 and R2D1 treatments were significantly higher than those of other treatments.When compared to R1,the middle and lower leaves'light transmittance was greatly improved by R2 row spacing,while the upper and middle leaves'light transmittance decreased significantly as density increased.In the R2D1 treatment,the middle leaves'light transmittance was considerably greater than those in the other treatments.In contrast,in the R1D3 treatment,the middle and lower leaves'light transmittance were significantly lower than those in the other treatments.The SPAD value of lower leaf D3 was significantly higher than that of D1.R2D3 in the bottom leaves had a substantially higher SPAD value than R2D2 and R1D1,and the value of R2D3 in the upper leaves was not substantially different from R1D2,but was significantly higher than those of other four treatments.The photochemical quenching coefficient(qP)rises with increasing row spacing,while the non-photochemical quenching coefficient(NPQ)decreases.The actual quantum yield[Y(Ⅱ)],electron transfer rate(ETR),and qP of flue-cured tobacco are all considerably reduced with density.The qP of R2D1 was significantly higher than those of R1D2,R1D3 and R2D3,and the NPQ of R1D2 was significantly higher than those of R1D3 and R2D2.While the dry matter accumulation and yield of the group grew with the increase in planting density,the proportion of dry matter accumulation and top-grade tobacco in a single plant of roasted tobacco initially increased before decreasing.In general,in the tobacco planting ecological plot of southern Guizhou Mountain,the 110 cm row spacing and planting density of 18 000 plants·hm-2 favor the development of an acceptable population structure and the enhancement of dry matter accumulation,which provides a technical reference for the high-quality and suitable yield of flue-cured tobacco in southern Guizhou Mountain.关键词
烤烟/群体结构/LAI/叶绿素荧光参数/干物质积累Key words
flue-cured tobacco/group structure/LAI/chlorophyll fluorescence parameters/dry matter accumulation引用本文复制引用
刘琳,赵强,蒋光华,蒋少阳,龙曾宇,刘大学,李章海,朱英华..黔南山地烤烟合理群体结构的光合机制研究[J].核农学报,2024,38(5):993-1003,11.基金项目
贵州省烟草公司黔南州公司科技项目(2022-522700-2-4-0001) （2022-522700-2-4-0001）
