岷江上游高山聚落区土地利用对干旱河谷上线的影响

发布时间：2018-01-14 00:35

本文关键词：岷江上游高山聚落区土地利用对干旱河谷上线的影响　出处：《西南科技大学》2015年硕士论文　论文类型：学位论文

【摘要】：岷江上游干旱河谷地处四川盆地与青藏高原的过渡地带,是岷江上游的生态脆弱带和敏感区。以岷江上游干旱河谷为研究对象,利用3 S技术,提取岷江上游土地利用空间信息,准确界定岷江上游干旱河谷的范围,构建岷江上游土地利用数据库,并分析土地利用变化过程及驱动力、干旱河谷边界位移特征和土地利用变化对干旱河谷的影响,研究结果可为岷江上游干旱河谷植被恢复、土地资源的合理利用和生态建设提供重要的科学参考。本文主要研究内容及成果有:(1)在A r c G IS 9.3的平台下,以G e o d a t a b a s e数据模型为构建工具,建立岷江上游土地利用数据库。利用土地利用模型,分析了土地利用的时空演变特征。(2)运用主成分分析法,并结合野外调查,选取了21个自然和社会经济因子,揭示自然环境的变化、经济发展、人口增长和农业技术革新是土地利用变化的主要原因。(3)利用遥感资料和地理信息技术,准确界定了岷江上游干旱河谷的范围,定量分析了岷江上游干旱河谷面积的变化及其与局地环境的关系、聚落与非聚落区干旱河谷边界位移的差异。(4)选取海拔、坡向和坡度3个因子,利用SPSS定量分析1 9 9 9~2 0 0 9年间土地利用变化对干旱河谷的影响。阐明不同高程和坡度上,干旱河谷面积减少量和边界垂直位移与耕地减少量的相关性最大且呈正相关。
[Abstract]:The arid valley in the upper reaches of Minjiang River is located in the transitional zone between Sichuan Basin and Qinghai-Tibet Plateau, which is the ecological fragile zone and sensitive area in the upper reaches of Minjiang River. Taking the arid valley in the upper reaches of Minjiang River as the research object, the 3s technique is used. The spatial information of land use in upper reaches of Minjiang River was extracted, the range of arid valley in upper reaches of Minjiang River was accurately defined, the database of land use in upper reaches of Minjiang River was constructed, and the process and driving force of land use change were analyzed. The effects of the boundary displacement characteristics and land use change on the arid river valley are discussed. The results of the study can be used to restore the vegetation of the arid valley in the upper reaches of Minjiang River. The rational utilization of land resources and ecological construction provide important scientific reference. The main research contents and results of this paper are as follows: 1) under the platform of Arc GIS 9.3. The land use database of upper reaches of Minjiang River was established by using the data model of GE o d a t a b a s e as a tool, and the land use model was used. This paper analyzes the characteristics of space-time evolution of land use. Using principal component analysis and field investigation, 21 natural and social economic factors are selected to reveal the changes of natural environment and economic development. Population growth and agricultural technological innovation are the main causes of land use change. (3) using remote sensing data and geographic information technology, the range of arid valley in the upper reaches of Minjiang River is accurately defined. The variation of arid valley area and its relationship with local environment in the upper reaches of Minjiang River are quantitatively analyzed. The difference of boundary displacement between settlement and non-settlement area in arid river valley is analyzed. (4) three factors, altitude, slope direction and slope degree, are selected. The effects of land use change on arid river valley during the period of 2009 ~ 2009 were analyzed quantitatively by SPSS, and the different elevation and slope were clarified. The correlation between the area reduction and vertical displacement of the dry valley and the decrease of cultivated land is the largest and positive correlation.
【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】：P942;F301.2

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