Acta Geographica Sinica ›› 2015, Vol. 70 ›› Issue (9): 1491-1502.doi: 10.11821/dlxb201509011

• Ecology and Environment • Previous Articles     Next Articles

Wavelet multi-resolution analysis of vegetation dynamic change in Dongting Lake Basin

Yuehong LONG1,2(), Jianxin QIN1(), Xinguang HE1, Zhun YANG1   

  1. 1. College of Resources and Environmental Science, Hunan Normal University, Changsha 410081, China
    2. College of Municipal and Surveying and Mapping Engineering, Hunan City University, Yiyang 413000, Hunan, China
  • Received:2015-05-05 Revised:2015-06-23 Online:2015-09-20 Published:2015-09-20
  • Supported by:
    Hunan Province 12th Five-Year Plan Key Subject of Geography The Scientific Research Project of Education Department of Hunan Province, No.14A097


The vegetation dynamic change can be analyzed by applying the discrete wavelet multi-resolution analysis (MRA) to decompose the normalized difference vegetation index (NDVI) time series into subseries at different time scales. In this thesis, the NDVI time series over Dongting Lake Basin was decomposed under different time scales by the wavelet transform. Then the latent seasonal and inter-annual variability of vegetation was mined and assessed. Finally, the possible causes of the changes were analyzed in combination with the land cover change analysis result and the rainfall data. The results show that by using the wavelet multi-resolution analysis, the information related to vegetation dynamics in Dongting Lake Basin can be extracted, which includes the mean of the inter-annual component of NDVI, the minimum level of NDVI, the amplitude of the annual phonological cycle, the timing of the maximum NDVI, the trend in the data series and the magnitude of the land cover change. The information effectively depicts the basin's vegetation dynamics characteristics. Furthermore, with the combination of land cover change analysis result and precipitation data, an obvious correlation was found between the change of vegetation cover and the precipitation change in the basin, that is, the vegetation dynamic changes response to precipitation is the most obvious in the western and northwestern parts of the basin. Although there is no obvious decrease in precipitation in some areas, the vegetation cover has a decreasing trend, which may be related to other factors, such as higher terrain and urbanization.

Key words: Dongting Lake Basin, MODIS NDVI, discrete wavelet transform, multi-resolution analysis, vegetation dynamic change