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首页> 外文期刊>Allelopathy Journal >Effects of potassium application on functional diversities of microbes in rhizospheric soil of continuous cropped tobacco
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Effects of potassium application on functional diversities of microbes in rhizospheric soil of continuous cropped tobacco

机译：施钾对连作烟草根际土壤微生物功能多样性的影响

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摘要

This study aimed to evaluate the effects of potassium application on the functional diversity of microbial community in rhizosphere soil of continuously cropped tobacco to understand the mechanism for development of replanting disease (continuous cropping problem) in tobacco. The inhibitory effects of tobacco rhizosphere soil on lettuce and tobacco seedlings were decreased with increase in dose of potassium. BIOLOG analysis indicated that in terms of the properties using different carbon sources, the microflora was not significantly different in the rhizosphere soil of continuous cropping tobacco under different potassium doses, except for the microorganisms using phenolic acid as the carbon source. Besides the correlative analysis suggested that the autotoxic effects of tobacco in the continuous cropping system were significantly and positively correlated with the inhibitory effects of tobacco rhizosphere soil on the target plants, lettuce. Further, the inhibitory effects of tobacco rhizosphere soil on the target plants were also positively correlated to the microorganisms using the carboxylic acid, amine, and phenolic acid as carbon sources. However, the microorganisms utilizing the amine were significantly and negatively correlated with the use of carboxylic acid and phenolic acid as carbon sources. In addition, the microbe feeding on the carboxylic acid was also significantly and negatively correlated to phenolic acid. The findings suggest that it is crucial to optimize the structure of microbial community in rhizosphere soil of tobacco in the continuous cropping system by using reasonable farming practice.
机译：本研究旨在评估钾肥对连作烟草根际土壤微生物群落功能多样性的影响，以了解烟草再种植疾病（连作问题）发展的机理。烟草根际土壤对生菜和烟草幼苗的抑制作用随钾剂量的增加而降低。 BIOLOG分析表明，就使用不同碳源的特性而言，在不同钾浓度下，连作烟草的根际土壤中的微生物区系无显着差异，但以酚酸为碳源的微生物除外。此外，相关分析表明，烟草在连作系统中的自毒作用与烟草根际土壤对目标植物生菜的抑制作用呈显着正相关。此外，使用羧酸，胺和酚酸作为碳源，烟草根际土壤对目标植物的抑制作用也与微生物呈正相关。然而，利用胺的微生物与使用羧酸和酚酸作为碳源显着负相关。另外，以羧酸为食的微生物也与酚酸显着负相关。研究结果表明，通过合理的耕作方式，优化连作系统中烟草根际土壤微生物群落的结构至关重要。

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