旅游和环境污染对广州城市公园森林植物和土壤的影响

研究了旅游和环境污染对广州城市公园森林群落土壤理化性质、植物种类多样性、群落结构和演替以及环境质量的影响.结果表明，由于旅游干扰，城市公园森林土壤的容重增加，而表土的物理性黏粒（＜0.01mm）、有机质和总氮含量降低.植物种类数目及多样性也随旅游强度的增加而降低.由于人为干扰，群落的结构变得简单，群落演替缓慢或停止.此外，环境污染也影响着城市公园植被,公园内植物叶中的硫和重金属含量明显高于远离污染源的中山大学校园树叶中的硫和重金属含量．

The impact of tourism and environmental pollution on plants and soil of forests in urban parks of Guangzhou

This study deals with the impact of tourism and environmental pollution on physical and chemical characteristics of soil, plant species diversity, structures and succession of communities, and environmental quality in urban parks of Guangzhou. The results show that due to disturbance of tourism in urban parks, the soil density inereases; and physical clay (<0.01mm), organic matter and total nitrogen of topsoil decrease. The number and diversity of plan species also decrease with increase of tourism intensity. The structures of communities are simple with their succession slow or stopped by human disturbance. In addition, the environmental pollution also affects the vegetation of urban parks. The concetrations of sulphur and heavy metals of tree leaves in urban parks are obviously higher than those in campus of Zhongshan University,which is far from the pollutant source.