甘肃省生态系统胁迫评估及生态恢复分析-环境科学专业论文.docxVIP

I II 进行分析。 (3)采用主成分分析法，体现指标之间显著的相关性和包含性，综合评价各 单元、不同时段生态环境胁迫的相对大小，结果显示，全省范围内生态环境胁迫 指数嘉峪关市最高，2000 年为 4.7127，至 2010 年增加到 5.5833，生态胁迫较 大，说明嘉峪关市生态问题仍较严重，亟待解决生态环境问题；其次为兰州市， EPI 指数由 2000 年的 2.4590 下降至 2010 年的 1.7466。说明兰州市近年来在生 态环境保护工作中有所成效，生态环境有所好转，但仍需加强城市生态建设，改 善市区环境状况。生态胁迫综合指数最小的地区是陇南市及甘南藏族自治州，说 明以上地区人类经济活动对生态环境影响都较小，生态环境相对较好，生态胁迫 压力小，但由于草场退化加速、自然灾害频繁等，其生态环境仍向不利的方向发 展，应加快生态恢复的步伐，以期实现区域的可持续发展。 (4)根据甘肃省的生态功能区划分和相应指标体系，针对自然地理条件和主 要及典型生态系统环境特征等因素，对甘肃省生态胁迫主要问题进行分析，提出 对策与措施，并将全省划分为四大地区，并结合各地区主要生态环境问题，进行 分地区生态胁迫主要问题的分析和评价，并提出对策和措施。 关键词：生态胁迫；生态系统；甘肃省；生态恢复；环境保护 PAGE PAGE IV Abstract Recent years, the regional ecological degradation is a threat to normal life and development. Study of the human and ecosystem degradation mechanisms’ recovery method and management mode is an important area of research regional ecology. Northwest Territories over the years has been the key areas of ecological and environmental protection work in China. with resource development degree improve and intensification of economic and social activities, Arid, low utilization of water resources, over-exploitation and utilization; desertification process faster, serious soil erosion, over-grazing, grassland degradation, frequent mudslides, landslides and other natural disasters; serious environmental pollution problems , has become the biggest problem in our life, also is currently the worlds attention hot issues. Assessment The Ecosystem Pressure and Ecosystem Restoration in Gansu Province, provide an important scientific basis for the Northwest regional ecological environmental protection and economic construction decisions. Through assessment nearly a decade of this area ecosystem stress and ecological restoration, we can Grasp the ecological environment background condition and its variation, put forward the countermeasures and suggestions. The regional ecosystem restoration is conducive to economic development and environmental protection implementations, to provide a reference for stress and ecolog