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冰川冻土 ›› 2018, Vol. 40 ›› Issue (4): 853-861.doi: 10.7522/j.issn.1000-0240.2018.0092

• 生态经济与可持续发展 • 上一篇    下一篇

基于EVI和MNDWI指数的石羊河流域水体、植被时空变化特征

任媛, 刘普幸   

  1. 西北师范大学 地理与环境科学学院, 甘肃 兰州 730070
  • 收稿日期:2018-01-08 修回日期:2018-06-15 出版日期:2018-08-25 发布日期:2018-10-08
  • 通讯作者: 刘普幸,E-mail:1025001508@qq.com. E-mail:1025001508@qq.com
  • 作者简介:任媛(1992-),女,藏族,甘肃天祝人,2015年在兰州城市学院获学士学位,现为西北师范大学在读硕士研究生,从事干旱区域环境与绿洲建设研究.E-mail:18993559201@163.com
  • 基金资助:
    国家自然科学基金项目(41561080)资助

Temporal and spatial variations of water and vegetation in Shiyang River basin based on EVI and MNDWI

REN Yuan, LIU Puxing   

  1. College of Geography and Environmental Science, Northwest Normal University, Lanzhou 730070, China
  • Received:2018-01-08 Revised:2018-06-15 Online:2018-08-25 Published:2018-10-08

摘要: 水体和植被是生态环境的重要自然要素,水体和植被的动态研究对认识干旱区生态环境的变化过程及保护和恢复具有重要的理论和实践意义。基于2001-2016年96期MODIS遥感数据和1992、1998、2004、2010、2016年5年Landsat遥感数据,提取EVI植被指数和改进的归一化水体指数(MNDWI),结合一元线性回归趋势分析方法对石羊河流域的水体和植被的时空变化特征进行了分析。结果表明,近16年来,流域植被EVI整体呈增加趋势,植被覆盖度上升,但随着季节变化,上、中、下游植被覆盖度变化分异明显;EVI植被指数年际变化倾向率与之一致。植被覆盖小幅增加地区占21.5%(春)、14.9%(夏)、8.8%(秋),保持不变区域占流域总面积的52.5%(春)、40.2%(夏)、35.0%(秋);此外,仍有轻度退化区和严重退化区。近25年来,研究区水域面积总体呈增大-减小-增大的波动变化趋势,1998年水域面积增大至725.92 km2,此后水域面积2010年减小至710.11 km2;但2010年以后水域面积又呈稳定增加趋势,水域面积2016年增加至723.00 km2。自然因素和人为因素是研究区水体和植被时空变化的驱动因素。

关键词: EVI, MNDWI, 石羊河流域, 时空变化

Abstract: Water and vegetation are two important natural factors of the ecological environment. Water and vegetation dynamic research to understand the change process of the ecological environment in arid region and protect and restore has important theoretical and practical significance. This article is based on 96 phase MODIS remote sensing data in 2001-2016 and 1992, 1998, 2004, 1998, 2016, 5 years Landsat remote sensing data, extracting EVI vegetation index and the MNDWI water index, combined with the trend of monadic linear regression analysis method of Shiyang River basin temporal and spatial variability of hydrological ecology. The results show that the past 16 years, the vegetation EVI in the basin has increased, and the vegetation coverage has increased, but with the change of seasons, the vegetation coverage changes in the upper, middle and lower reaches are obviously different. The spatial variation of EVI vegetation index is consistent with that of the slope. Vegetation cover a small increase in 21.5% (spring), 14.9% (summer), 8.8% (autumn), and remained unchanged at 52.5% (spring), 40.2% (summer) and 35.0% (autumn). In addition, there are still mild degenerate areas and severe degenerate areas. In the past 25 years, the water area in the study area has generally increased, decreased, and increased. The area of water area increased to 725.92 km2 in 1998 and the area of water area decreased to 710.11 km2 in 2010. However, from 2010 onwards, the area increased steadily and the area of water area increased to 723.00 km2 in 2016. Natural and man-made factors were the driving factors for the temporal and spatial changes of the hydrological ecology in the study area.

Key words: EVI, MNDWI, Shiyang River basin, temporal and spatial variations

中图分类号: 

  • X87