快速城市化的珠江三角洲非污染生态影响初步分析

人类生活和生产中各种开发利用自然资源活动是引起非污染生态影响的主要原因,而城市化是其中影响最深的过程之一.珠江三角洲作为我国快速城市化的典型区域,城市化引起的非污染生态问题显著.该区域的土地利用变化大,城镇、交通用地迅速增加,林地、草地、耕地则大幅减少.城市植被的种类少、优势种突出、外来物种较多,从而明显降低了区域的生物多样性.由于不合理开发土地资源的人为活动,城市区域的水土流失严重,而且侵蚀强度相当大.

Study on Non-polluted Ecological Impact of Fast Urbanization in the Pearl River Delta

Human activities are main causes of non_polluted ecological impact, and urbanization is one of the most important impacts. The Pearl River Delta is a typical region of fast urbanization in China. The non_polluted ecological impact is very obvious in this region, where the land use has changed rapidly. The build_up area increased fast and woodland, grassland, farmland decreased significantly. Species diversity was low; dominant species was outstanding and there was many exotic species in urban vegetation. Thereby, the biodiversity in the region was reduced by urbanization. In addition, the soil erosion was serious because of unreasonable exploitation of land resources in the region.