秸秆覆盖与揭膜互作对坡耕地烟田土壤细菌群落及烟叶品质的影响

选择云南省典型坡耕地烟田,以烤烟K326和玉米秸秆为试材,设置秸秆覆盖和揭膜交互方式的6个处理:对照(CK),为常规栽培模式,不覆秸秆+揭膜培土;T1,秸秆覆盖+揭膜培土;T2,秸秆覆盖+破膜培土;T3,秸秆覆盖+不揭膜;T4,不覆秸秆+破膜培土;T5,不覆秸秆+不揭膜.通过大田小区比较试验,揭示不同处理对坡耕地烟田土...

Effects of Straw Mulching and Film-uncovering on the Bacterial Community of Sloping Farmland Soil and Tobacco Leaf Quality

In the typical sloping tobacco field of Yunnan Province, flue-cured tobacco K326 and corn straw were selected as test materials, and six treatments were set: conventional mode without straw covering and film-uncovering (CK); straw mulching and film-uncovering (T1); straw mulching and film breaking (T2); straw mulching and film-covering (T3); no straw mulching and film breaking (T4); no straw mulching and film-covering (T5). The effects of different treatments on soil nutrients, bacterial community structure and tobacco leaf quality were investigated in order to provide a scientific guidance for straw mulching and film-uncovering of sloping farmland in a flue-cured tobacco planting region of Yunnan Province. The results showed that, compared with CK treatment, 1) straw mulching was beneficial to improve the level of nutrient content of sloping farmland red soil, but was undesirable to richness and diversity of bacterial community, T5 treatment was beneficial to improve richness and diversity of soil bacterial community, especially for Proteobacteria (29.26%) and Acatinobacteria (36.23%) had a greater influence on the relatively abundance, T2 treatment significantly increased the number of endemic bacteria and Proteobacteria (29.10%). Firmicutes (6.75%), Planctomycetes (1.01%) relatively abundance; 2) Straw mulching was beneficial to improve the chemical composition coordination and sensory quality of upper tobacco leaves, the comprehensive index of chemical composition of B2F grade tobacco leaves was increased by 6.1% and 1.9%, and the comprehensive index of sensory quality was increased by 6.0% and 4.5%, respectively, in the processing,by T1 treatment to improve the effect of upper tobacco leaf chemical components and sensory quality of coordination, T2 treatment took second place, and T5 was the worst treatment, As a whole, straw mulching and film breaking mode is more suitable for tobacco cultivation of sloping farmland.