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首页> 外文期刊>International journal of soil science >Influence of the Tropical Grass Brachiaria brizantha (Hochst. ex A. Rich.) Stapf on Bacterial Community Structure in Petroleum Contaminated Soils
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Influence of the Tropical Grass Brachiaria brizantha (Hochst. ex A. Rich.) Stapf on Bacterial Community Structure in Petroleum Contaminated Soils

机译：热带草Bracharia brizantha（Hochst。ex A. Rich。）Stapf对石油污染土壤中细菌群落结构的影响

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Phytoremediation of organics is presumed to be based on the stimulation of microorganisms in the rhizosphere, resulting in a higher microbial population and activity and an altered community composition. Substrate utilization patterns of BIOLOG Eco PlatesTM, consisting of 31 carbon source s, were used to determine the effect of the tropical grass Brachiaria brizantha on microbial carbon source utilization patterns in heavy crude oil contaminated soil and to find a possible correlation with enhanced crude oil degradation found in previous experiments. Counts of numbers of carbon source s used only resulted in differences between contaminated and uncontaminated soil while Principal Component Analysis (PCA) showed different carbon source utilization patterns between rhizosphere soil and non-rhizosphere or unplanted soil. Similar to its influence on oil degradation, B. brizantha had a significant effect on microbial community patterns after 14 weeks but only a minor effect after 30 weeks. In particular, D, L-α-glycerol phosphate was more used by microbial communities of the rhizosphere, pointing to a possible key role of phosphorus in the highly nutrient deficient savannah soils of Venezuela and its mobilization in the rhizosphere. Missing incisiveness of the results can be related to the fact that fungi might play a central role in phytoremediation of petroleum hydrocarbons in the tropics but are not detected by the BIOLOG assay.
机译：据推测，有机物的植物修复是基于对根际微生物的刺激，从而导致更高的微生物种群和活性以及改变的群落组成。利用由31个碳源组成的BIOLOG Eco Plates TM 的底物利用模式来确定热带草臂蕨（Brachiaria brizantha）对重质原油污染土壤中微生物碳源利用模式的影响并找出可能与先前实验中发现的原油降解加剧有关。碳源使用数量的计数仅导致受污染和未污染土壤之间的差异，而主成分分析（PCA）显示，根际土壤与非根际土壤或未种植土壤之间的碳源利用方式不同。与其对油类降解的影响相似，B。brizantha对14周后的微生物群落模式有显着影响，而对30周后的影响很小。尤其是，D，L-α-甘油磷酸根被根际微生物群落所广泛使用，这表明磷在委内瑞拉高度缺乏营养的稀树草原土壤中的可能关键作用及其在根际中的迁移。缺少清晰的结果可能与以下事实有关：真菌可能在热带地区石油烃的植物修复中起着核心作用，但无法通过BIOLOG分析检测到。

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