Study on Spatio-temporal Evolution of Vegetation Cover in the Nujiang River Basin of Yunnan Based on MODIS-NDVI Data

doi:10.13466/j.cnki.lyzygl.2018.04.015

Abstract

Abstract:

The spatio-temporal distribution,characteristics of variation and evolutionary trends of vegetation cover of Nujiang River basin in Yunnan Province during the period 2000—2015 were analyzed with wavelet analysis,Trend analysis,Cv methods and Hurst index based on MODIS-NDVI dynamic data.The results showed that:(1)From the temporal variation,the monthly variation of NDVI in the basin showed an overall growth trend,with an average monthly growth rate at 0.95%.For the annual variation aspect,the vegetation cover had an increasing trend at the rate of 0.21/(10 a),and there is a change period of about 14 years,which were obtained through the inspection by a significant level of 0.05.(2)For the spatial aspect,the high vegetation coverage area (0.6<NDVI<1)in the river basin accounts for 61.95%,which is better overall.Influenced by factors such as high-altitude terrain in the north and expansion of construction land in the south,the pattern of vegetation cover showed low-high-low distribution characteristics from north to south.In the last 16 years,the overall vegetation cover was in a low-level fluctuation,with low fluctuation region and lower fluctuation region accounting for 83.18%.Based on this fluctuation,areas showed a trend towards improvement accounting for about 59.49% of the total area,and 14.41% and 32.34% of the regions showed degenerate and unchanging trend.(3)For the spatial sustainability aspect,about 59.01% of the regional vegetation will continue the trend of the past,and 37.98% will develop in the reverse direction,Co-directional features are stronger than reverse features.In the future change of vegetation cover,regions with the invariable and benign development directions of vegetation,occupy 26.50% and 39.36%,and 3.14% of the regions,which will develop in a unfavorable direction,and be mainly distributed in the urban construction areas such as the center and periphery of the southern counties (cities)and the areas along the tributaries such as the Meng Baltic River,Kuke River and Mengtong River,which needs to be taken seriously.

Key words: MODIS-NDVI, Vegetation cover, spatio-temporal evolution, Hurst index, Nujiang River Basin

CLC Number:

TP79
X37

LI Jie, ZHANG Jun, LIU Chenli, ZHANG Han. Study on Spatio-temporal Evolution of Vegetation Cover in the Nujiang River Basin of Yunnan Based on MODIS-NDVI Data[J]. FOREST RESOURCES WANAGEMENT, 2018, (4): 90-99.

Figures/Tables 9

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