甘肃长江流域水土保持与生态安全评价

摘要

针对甘肃长江流域的生态安全现状，从生态环境压力、状态、响应3个方面选取了12个评价指标，采用PSR模型建立了该流域生态安全指标体系，对指标阈值数据归一化后，得到各单项指标的生态安全值，结合指标权重，得到区域生态安全值。结果表明，近年来，该流域生态安全状况得到明显改善，生态经济系统的承载能力不断增强，生态安全总体水平呈现出由风险态向较安全态转变的逐步上升趋势。%For-evaluating-ecological-security-of-Yangtze-River-Basin-in-Gansu-Province-,-an-index-system-of-basin-ecological-se-curity-is-established-using-PSR-model-that-contains-12-assessing-indicators-by-consideration-of-pressure-,-ecological-status-and-re-sponse-of-ecological-environment-.The-ecological-security-value-of-each-indicator-is-obtained-after-threshold-of-the-indicator-is-nor--malized,-and-the-ecological-security-value-of-the-area-is-obtained-in-combination-with-weights-of-indicators-.The-results-show-that-the-ecological-security-status-of-the-area-has-gained-significant-improvement-in-recent-years-and-the-capacity-of-ecological-economy-system-is-getting-stronger-,-and-the-total-level-of-ecological-security-is-in-an-upward-trend-with-a-transformation-from-risk-status-to-safer-status.