2005—2018年四川省广元市土地利用动态变化及驱动力分析

Analysis on Dynamic Change and Driving Force of Land Use in Guangyuan City of Sichuan from 2005 to 2018

  • 摘要: 为研究四川省广元市近年来土地利用变化,基于2005、2010、2015、2018年四期的土地利用遥感监测数据、统计年鉴和土地调查数据,在ArcGIS技术的支持下,借助单一土地利用变化动态度、土地转移矩阵和土地利用变化综合指数数学方法,分析了广元市近13年土地利用动态变化特征及其动因。结果表明:(1)广元市2005—2018年林地、水体、建设用地面积呈增加趋势,耕地、草地、未利用地面积有所减少;各地类的变化速率由大到为:建设用地>水体>未利用地>草地>林地>耕地,以2015—2018年变化尤为显著,各地类的变化速度和幅度差异明显,且不同地类间转换频繁。(2)土地利用综合指数快速上升,土地利用水平逐步提高,生态环境质量呈好转趋势;(3)影响广元市2005—2018年土地利用变化的主要驱动力因素为经济发展状况、交通运输及旅游业的发展、人口增长因素以及退耕还林政策的推动。其研究结果可以为广元市后期的土地和城市生态可持续发展提供决策依据。

     

    Abstract: In order to study the change of land use in Guangyuan City of Sichuan in recent years, based on the 2005, 2010, 2015, 2018, four remote sensing monitoring of land use data and land survey data and statistical yearbook, with the support of ArcGIS technology, with the help of a single dynamic change of land use, land transfer matrix and the comprehensive index of land use change research methods, analyzed the nearly 13 years in Guangyuan City land use dynamic change characteristics and motivation. The results show that: (1)from 2005 to 2018, the area of forest land, water area and construction land in Guangyuan increased, while the area of cultivated land, grassland and unused land decreased. The change rate of each local class changed from large to: construction land > water area > unused > grassland > forest land > cultivated land, which changed significantly from 2015 to 2018. The change rate and range of each local class were significantly different, and the transfer between different local classes was frequent. (2)The comprehensive land use index of Guangyuan City is rising rapidly, the land use level is gradually improved, and the ecological environment quality is improving. (3)The main driving factors influencing the land use change in Guangyuan City from 2005 to 2018 are the economic development, the development of transportation and tourism, the factor of population growth and the promotion of the policy of returning farmland to forests. The research results can provide decision basis for the land and urban ecological sustainable development of Guangyuan City in the later period.

     

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