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首页> 外文期刊>Soil Biology & Biochemistry >Does the depletion of pentachlorophenol in root-soil interface follow a simple linear dependence on the distance to root surfaces
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Does the depletion of pentachlorophenol in root-soil interface follow a simple linear dependence on the distance to root surfaces

机译：根-土壤界面中五氯苯酚的消耗是否遵循与根表面距离的简单线性关系

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To understand root-soil-microbe interactions in rhizo-depletion of xenobiotics, we conducted a glasshouse study using specially designed laminar rhizoboxes which allow intact layers of near- (1-5 mm) and far- (>5 mm) rhizosphere soil to be harvested separately from root surfaces without the removal of the root material itself. Plant (Lolium perenne L.) seedlings were grown for 90 days in a soil treated with PCP at 20 and 50 mg kg-1. Changes in PCP depletion, soil microbial biomass and community structure (as indicated by phospholipid fatty acids (PLFAs) profiles) with increasing distance from the root surfaces were then assessed after harvesting. Surprisingly, depletion of PCP in the planted rhizoboxes exhibited a nonlinear dependence on the distance to root surfaces, with the most rapid loss in the 2 or 3 mm near-rhizosphere layers, contrasting to the well-known linear gradient of root exudates and mineral nutrients etc. (generally, the extent gradually decreased with increasing distance from the root surface). Soil microbial biomass carbon, however, decreased linearly as expected with increasing distance from the roots. The microbial community structures as indicated by PLFA profiles showed distance-dependent selective enrichment of competent species that may be responsible for efficient PCP depletion. The results suggest that root exudates induced modifications of microbial communities in the PCP contaminated rhizosphere and spatially modified the dominant species within these communities, resulting in the nonlinear PCP depletion pattern.
机译：为了了解异源生物根际枯竭中的根-土-微生物相互作用，我们使用专门设计的层状根状盒子进行了温室研究，该层状根盒子允许完整的近-（1-5 mm）和远-（> 5 mm）根际土壤层与根表面分开收获，而不去除根材料本身。使植物（黑麦草）幼苗在用20和50 mg kg-1的PCP处理过的土壤中生长90天。然后在收获后评估PCP消耗，土壤微生物生物量和群落结构（如磷脂脂肪酸（PLFA）图谱）随距根表面距离增加的变化。出人意料的是，种植的根际箱中的五氯苯酚消耗量与根表面距离之间存在非线性关系，在根际2或3毫米附近损失最迅速，这与根系分泌物和矿质养分的线性梯度形成对比（通常，程度会随着距根表面距离的增加而逐渐减小）。然而，土壤微生物生物量碳随着与根部距离的增加而线性下降。 PLFA谱图表明，微生物群落结构表明感受态物种的距离依赖性选择性富集可能是有效PCP消耗的原因。结果表明，根系分泌物诱导了受PCP污染的根际中微生物群落的修饰，并在空间上修饰了这些群落中的优势种，从而导致了PCP的非线性消耗模式。

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