岷江上游干旱河谷演化研究及生态安全评价

发布时间：2018-06-18 10:21

本文选题：岷江上游 + 干旱河谷　；参考：《西南科技大学》2015年硕士论文

【摘要】：岷江上游是岷江流域的生命线,是成都平原及长江流域的生态环境屏障,其生态环境质量及生态安全状况直接关系到成都平原及四川盆地丘陵区的可持续发展。多年来,自然环境的恶化以及人类活动的加剧对岷江上游的生态环境造成了强烈干扰和破坏,导致生态环境质量下降,生态安全受到威胁。研究针对岷江上游独特的区域特征,逐渐退化的自然环境以及日趋尖锐的人类需求与自然资源之间的矛盾,以GIS和RS作为技术支撑,以遥感数据和其他多源空间数据为基础数据,提取了1994年、2001年、2007年、2009年、2013年五个时期20年岷江上游干旱河谷的范围,分析研究其演化特征,得出干旱河谷演化波动性较强,受人类干扰较明显;利用层次分析法构建了岷江上游生态安全评价指标体系,并确定各指标的权重值,利用综合指数法计算了2001年和2009年各评价单元的生态安全指数,对岷江上游地震前后生态安全状况及其变化进行了评价分析,得出岷江上游生态安全状况有变好的趋势,且干旱河谷和生态安全在空间分布和属性特征上都存在相关性,两者相互影响,相互制约。对岷江上游生态安全变化特征及驱动因素的研究,对岷江上游甚至整个长江流域生态环境治理与恢复工作的实施都具有指导意义,亦为社会经济发展制定决策提供基础的科学参考。
[Abstract]:The upper reaches of Minjiang River is the lifeline of Minjiang River basin and the ecological environment barrier of Chengdu Plain and Yangtze River basin. Its ecological environment quality and ecological security condition are directly related to the sustainable development of Chengdu Plain and Sichuan Basin hilly area. Over the years, the deterioration of the natural environment and the intensification of human activities have caused strong interference and destruction to the ecological environment in the upper reaches of Minjiang River, resulting in the deterioration of the quality of the ecological environment and the threat to the ecological security. In view of the unique regional characteristics of the upper reaches of Minjiang River, the gradual degradation of the natural environment and the increasingly sharp contradiction between human needs and natural resources, GIS and RS are taken as the technical support. Based on remote sensing data and other multi-source spatial data, the range of arid valleys in the upper reaches of Minjiang River in 1994, 2001, 2007, 2009 and 2013 was extracted, and its evolution characteristics were analyzed and studied. The ecological security evaluation index system of the upper reaches of Minjiang River was constructed by AHP, and the weight of each index was determined, and the ecological security index of each evaluation unit in 2001 and 2009 was calculated by comprehensive index method. The ecological security status and its changes before and after the earthquake in the upper reaches of Minjiang River are evaluated and analyzed. It is concluded that the ecological security situation in the upper reaches of Minjiang River has a tendency to improve, and there is a correlation between the spatial distribution and the attribute characteristics of the arid valley and ecological security. The two influence and restrict each other. The study on the characteristics and driving factors of ecological security in the upper reaches of Minjiang River is of guiding significance to the implementation of ecological environment control and restoration work in the upper reaches of Minjiang River and even the whole Yangtze River basin. Also for social and economic development to provide a basis for decision-making scientific reference.
【学位授予单位】：西南科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：X826;X171.1

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