CESAM (Centro de Estudos do Ambiente e do Mar) & Departamento de Química, Universidade de Aveiro, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal.
Chemosphere. 2010 Nov;81(7):968-75. doi: 10.1016/j.chemosphere.2010.07.050. Epub 2010 Aug 14.
The determination of fatty acids (FA) has been extensively used as a sensitive and reproducible parameter for characterizing the soil microorganism communities and to detect various environmental stresses. The aim of this study was to assess the variability of FA in urban soils, in an attempt to use it as a differentiator of urban soil usage. FA were extracted from soils of five different usages (ornamental gardens, ornamental gardens/roadsides, roadsides, parks and urban agricultural areas) in three Portuguese cities and FA concentration was determined by gas chromatography coupled to mass spectrometry (GC-MS). A total of fifteen FA have been detected and the concentration of each FA, in general, decreased in the following order: Lisbon>Estarreja>Viseu, for all the usages of urban soil. According to soil microbial indicators, the concentration of Gram-negative bacteria was lower than the concentration of Gram-positive bacteria, which together were, in turn, higher than the concentration of fungi for all the usages of urban soil and city. This study assessed the FA profiles of urban soils, which differ as a function of soil usage. The FA profile also is at the source of the inference that stress in soil microorganism communities results from the different urban environment in each city.
脂肪酸（FA）的测定已广泛用于作为表征土壤微生物群落和检测各种环境胁迫的敏感和重现性参数。本研究的目的是评估城市土壤中 FA 的变异性，试图将其用作城市土壤使用的区分因素。从葡萄牙三个城市的五种不同用途（园林、园林/路边、路边、公园和城市农业区）的土壤中提取 FA，并通过气相色谱-质谱联用（GC-MS）测定 FA 浓度。共检测到十五种 FA，总的来说，所有城市土壤的 FA 浓度均按以下顺序降低：里斯本>埃斯特雷拉>维塞乌。根据土壤微生物指标，革兰氏阴性菌的浓度低于革兰氏阳性菌的浓度，而革兰氏阳性菌的浓度又高于所有城市土壤和城市中真菌的浓度。本研究评估了城市土壤的 FA 分布，这些分布因土壤用途而异。FA 分布也表明，土壤微生物群落的压力源于每个城市不同的城市环境。
