Effects of Tobacco-Sweet Potato Intercropping Systems on Rhizosphere Soil Microbial Community Structure and Tobacco Leaf Quality
FAN Jinglei
ZHAO Yuanyuan
CHEN Shengli
ZHANG Shuwei
FAN Yikuan
SONG Ruifang
QI Caining
WANG Luheng
SHI Hongzhi
Abstract：To optimize the intercropping structure of tobacco and sweet potato,an experiment was conducted in Mianchi County,Sanmenxia City,Henan Province.Three treatments were set up,including tobacco monoculture(CY),tobacco and sweet potato planted in the same ridge(YS-T),and tobacco and sweet potato planted in separate ridges(YS-Y),to investigate the effects of the tobacco-sweet potato intercropping system on soil fertility,microbial community structure,and tobacco leaf quality.The results showed that compared with tobacco monoculture,the tobacco-sweet potato intercropping significantly altered the physicochemical properties and microbial community structure of rhizosphere soil.In particular,the YS-Y treatment significantly decreased soil pH and significantly increased the contents of organic matter,available phosphorus,and available potassium.Among soil microorganisms,the relative abundances of fungi such as Ascomycota and Basidiomycota,and bacteria such as Acidobacteriota and Actinomycetota increased,while the relative abundances of Chytridiomycota and Pseudomonadota decreased.The Shannon and Chao1 indices of rhizosphere fungi increased by 19.24%(p<0.05)and 7.85%(p>0.05),respectively,and the Shannon and Chao1 indices of rhizosphere bacteria increased significantly by 8.64% and 18.41%.After curing,the contents of total sugar,reducing sugar,and potassium in tobacco leaves were higher than those in the tobacco monoculture,increasing by 8.90%—15.52%,13.40%—13.68%,and 21.08%—25.35%,respectively,while total nitrogen,nicotine,and chlorine contents decreased.The contents of aroma compounds such as megastigmatrienone,neophytadiene,and β-dihydroactinidiolide increased,resulting in more balanced chemical composition in the tobacco leaves and improved sensory quality.In summary,tobacco-sweet potato intercropping,especially the YS-Y pattern,promotes soil nutrient cycling by optimizing the microbial community structure in the rhizosphere of flue-cured tobacco,thereby enhancing tobacco leaf quality.
Keywords：TobaccoSweet potatoIntercroppingSoil microorganismsTobacco leaf quality
Publication Date：2026-06-15
Online Publishing Date：2026-09-12(First online date of this platform, not the publication date of the document)
Pages：13( 31-43 )