Abstract
Soil physicochemical properties and microbial diversity both play equally important roles in tobacco cultivation. However, the relationship between these factors remains unclear. In this study, we investigated their correlations through the whole tobacco growth period, including the pretransplanting (YX-p), root extending (R), flourishing (F), and mature (M) stages in the Yuxi region of the Yunnan-Guizhou Plateau by measuring physicochemical properties and conducting 16S/18S rRNA analysis. The analysis demonstrated that the microbial community richness and diversity continuously changed along with the growth course of the tobacco. Multiple environmental factors showed a certain correlation with the diversity of microbial communities. Some bacteria could accumulate nitrogen during the growth stages, and the diversity of the bacterial community also increased when the content of organic matter rose. In addition, the water content and available K also influenced the diversity of the microbial community. The dynamic changes in soil physicochemical properties and enzyme activities gave rise to differences in the microbial community composition and structure, all of which affected the growth of tobacco. This study revealed the time-course relationship between environmental factors and microbial diversity in tobacco soil. An understanding of this relationship provides guidance for research on the interaction system of plants, soil and microbes and on improving plant yield and quality.
Highlights
Soil physicochemical properties and microbial diversity both play important roles in tobacco cultivation
Wang et al.[29] explored the bacterial community structure and functional potential of rhizosphere soils as influenced by nitrogen addition and bacterial wilt disease under continuous sesame cropping, proposing that they had a significant impact on the structure of bacterial communities in rhizosphere soil and that signal transduction and translation could play an important role in preserving plant health
In this study, based on the superior physicochemical characteristics and microbial community richness/diversity of the optimum plot (YX-2) compared to those of the general plot (YX-1), a YX-2 plot was chosen for analysis of the time-course relationship between the soil physicochemical properties in tobacco cultivation and the soil microbial community structure
Summary
Soil physicochemical properties and microbial diversity both play important roles in tobacco cultivation. This study revealed the time-course relationship between environmental factors and microbial diversity in tobacco soil An understanding of this relationship provides guidance for research on the interaction system of plants, soil and microbes and on improving plant yield and quality. It is worth mentioning that the soil enzyme activities result from the integrative action of multiple microbes and other factors (including temperature, water content, nitrogen, phosphorus and crop root system), giving rise to their differences in soil enzyme activity in different regions or growth stages[6,10]. Chen et al.[30] studied the mechanism by which organic fertilizer and effective microbes could mitigate the yield constraints of peanut continuous cropping in a red soil of southern China These studies failed to study the relationship between the soil physicochemical properties and the microbial diversity of rhizosphere soils during the different growth stages of tobacco cultivation. A correlation between microbial diversity and soil physicochemical properties was proposed that could benefit soil improvement and fertilization strategy optimization during tobacco cultivation
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