Forests within major cities, such as Table Mountains, Afromontane forests, are constantly subjected to industrial and urban pollution sources. Cape Town is one of the most profound areas in the world for plant extinction and already has a high occurrence of threatened species. The objective of this study was to determine the concentrations of the metals, aluminium and iron, commonly emitted from anthropogenic activities in key forest organisms (mosses, lichens and millipedes), soil and leaf litter in three forests (Platbos, Orange Kloof and Newlands) in the Western Cape, South Africa. In general, the metal concentrations increased with traffic volumes and traffic behaviour (frequent braking and acceleration). Factors, such as the locations of the sites and forests, wind and different accumulation abilities of bioindicators had a notable impact, as did the natural geological origin of aluminium and iron. Of significance in this study was the metal contamination in forests in close proximity of the centre of the city Cape Town.

主要城市的森林，如桌山、非洲山地森林，经常受到工业和城市污染源的影响。开普敦是世界上植物灭绝最严重的地区之一，并且已经是濒危物种的高发地区。本研究的目的是确定三个森林（Platbos、Orange Kloof 和 Newlands）中主要森林生物（苔藓、地衣和千足虫）、土壤和落叶中的人为活动通常排放的金属、铝和铁的浓度在南非西开普省。一般来说，金属浓度随着交通量和交通行为（频繁刹车和加速）而增加。场地和森林的位置、风力和生物指标的不同积累能力等因素有显着影响，铝和铁的自然地质起源也是如此。在这项研究中，重要的是开普敦市中心附近森林中的金属污染。