连作年限对植烟根际土壤化感物质积累的影响——以湖北黄棕壤烟田为例

为明确烤烟不同连作年限对土壤化感物质积累的影响,以湖北典型的植烟黄棕壤为例,采用甲醇提取–乙酸乙酯3次萃取-GC-MS检测方法,分析其根际土壤中化感物质的组成和含量.结果共检测出化感物质5类13种,其中邻苯二甲酸、对羟基苯甲醛和邻苯二甲酸二异辛酯等在以往植烟土壤研究中未见报道;化感物质含量随连作年限的延长呈增加趋势,与...

Effects of Continuous cropping years on allelochemicals in Flue-cured Tobacco

Allelochemicals are secondary metabolites or transformants released from plants into the environment and can influence the nearby plants harmfully or beneficially. In this study, the allelochemicals in typical yellow brown soils with different years of tobacco continuous cropping were detected by GC-MS after being extracted by methanol and ethyl acetate respectively. The results showed that in total 13 kinds of allelochemicals were detected, including 5 kinds of the acids, 3 kinds of the esters, 2 kinds of the phenolics, 2 kinds of the aldehydes and 1 kind of the alcohols, among of which, phthalic acid, p-hydroxybenzaldehyde and di (2-ethylhexyl) phthalate were first reported in tobacco study. The contents of allelochemicals in rhizosphere soil showed an increasing trend with the year of tobacco continuous cropping. Comparing with 1 a of tobacco planting, the contents of phthalic acid, benzoic acid, terephthalic acid, diisobutyl phthalate, 3,4-di-tert-butyl-pheno and 2-Methoxy-4-formylphenol increased more than 10 times under 10 a continuous cropping, which could possibly reduce or deteriorate the yield and quality of tobacco.