四川农业大学学报 ›› 2018, Vol. 36 ›› Issue (06): 792-797.doi: 10.16036/j.issn.1000-2650.2018.06.012

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岷江上游小流域NDVI与环境要素的多尺度耦合关系研究

熊亚兰1, 张科利2, 朱雅晗1, 夏丽1   

  1. 1. 四川农业大学资源学院,成都 611130;
    2. 北京师范大学地理科学学部地理学院,北京 100875
  • 收稿日期:2018-04-13 出版日期:2018-12-28 发布日期:2021-03-01
  • 作者简介:熊亚兰,副教授,博士,主要从事3S技术在资源环境中的应用研究,E-mail:492174073@qq.com。
  • 基金资助:
    国家自然科学基金重点项目(41730748);四川省教育厅重点项目(18ZA0375)。

Multi-Scale Coupling Relationships between NDVI and Environmental Factors in Sub-Watershed of the Minjiang River Upper Reaches

XIONG Yalan1, ZHANG Keli2, ZHU Yahan1, XIA Li1   

  1. 1. College of Resource,Sichuan Agricultural University,Chengdu 611130,China;
    2. School of Geography,Faculty of Geographical Science,Beijing Normal University,Beijing 100875,China
  • Received:2018-04-13 Online:2018-12-28 Published:2021-03-01

摘要: 【目的】揭示多尺度下环境要素对植被覆盖度高低的影响程度,为生态环境保护和农业产业规划提供依据。【方法】以岷江上游干旱河谷渭门小流域为研究对象,利用该区2015年的OLI遥感影像及DEM、居民点和河流等数据,运用二维小波变换研究了该区NDVI与高程、坡度、坡向、距最近居民点距离、距最近河流距离等环境要素的多尺度耦合关系。【结果】结果表明渭门小流域NDVI的空间分布特征为东南低西北高、河谷低山地高。多尺度下坡向和NDVI的空间分布相似度最高,相关性最强,其次是高程。NDVI与地形因子相关性大小受尺度变化的影响较明显。【结论】NDVI的空间分布特征是由高程、坡度和坡向等5个环境要素共同决定,但是各要素对NDVI的控制作用大小随尺度发生改变。

关键词: 小波变换, 空间尺度, 环境要素, NDVI, 渭门小流域

Abstract: 【Objective】 The aim of the study was to reveal effects of topographic factors on vegetation coverage at multi-scales and to provide some theoretic basis and practice guide for protection of ecological environment and planning of agricultural industry. 【Method】 In this study, the correlations between normalized difference vegetation index (NDVI) and environmental factors (elevation, slope, aspect, distance to the nearest resident and distance to the nearest river) were examined at multi-scales in a small watershed of the Minjiang River Upper Reaches based on two-dimensional wavelet transform. Wavelet low-frequency coefficients could reflect the global spatial patterns of NDVI and environmental factors. The spatial distributions of low-frequency component were mapped and the regression equation of NDVI were established on the basis of two-dimension wavelet transform. 【Result】 The results showed that northwest area and hilly area of the sub-watershed had high NDVI value but southeast area and valley had low NDVI value. The spatial distribution of aspect and NDVI had high similarity and strong correlation, followed by elevation. The correlations were obviously influenced by scale change. 【Conclusion】 The spatial distribution of NDVI was determined by all environmental factors. However, the effect of each factor on NDVI varied with scale.

Key words: wavelet transform, multi-scale, environmental factors, NDVI, Weimen watershed

中图分类号: 

  • K903