基于EVI和MNDWI指数的石羊河流域水体、植被时空变化特征

doi:10.7522/j.issn.1000-0240.2018.0092

摘要/Abstract

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:

任媛, 刘普幸. 基于EVI和MNDWI指数的石羊河流域水体、植被时空变化特征[J]. 冰川冻土, 2018, 40(4): 853-861.

REN Yuan, LIU Puxing. Temporal and spatial variations of water and vegetation in Shiyang River basin based on EVI and MNDWI[J]. JOURNAL OF GLACIOLOGY AND GEOCRYOLOGY, 2018, 40(4): 853-861.

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