[1]WU Yidan,MA Yue,WU Haoran,et al.Characteristics of Temporal and Spatial Evolution and Driving Forces of Vegetation Index in Sichuan Based on MODIS-EVI[J].Research of Soil and Water Conservation,2020,27(05):230-236,243.
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Characteristics of Temporal and Spatial Evolution and Driving Forces of Vegetation Index in Sichuan Based on MODIS-EVI
Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
27
Number of periods:
2020 05
Page number:
230-236,243
Column:
目次
Public date:
2020-08-20
- Title:
- Characteristics of Temporal and Spatial Evolution and Driving Forces of Vegetation Index in Sichuan Based on MODIS-EVI
- Keywords:
- MODIS-EVI; space-time evolution; driving force; Sichuan Province
- CLC:
- Q948
- DOI:
- -
- Abstract:
- Sichuan Province has the complex topography and geomorphology which is a strategic place for ecological barriers in the Yangtze River Basin. It is of great significance to investigate the temporal and spatial evolution of vegetation coverage in this region to test the completion of various soil and water conservation projects and the implementation of ecological and environmental construction measures. Based on the MODIS Enhanced Vegetation Index(EVI)data, the trend-line analysis, Moran index analysis, and hotspot analysis were used to analyze the temporal and spatial changes of the EVI vegetation index and its influencing factors in Sichuan Province from 2001 to 2018. The results showed that:(1)the spatial distribution of the EVI vegetation index in Sichuan Province was obviously high in the east and low in the west, and the spatial heterogeneity was significant;(2)the EVI index fluctuated at a rate of 0.22% per year from 2001 to 2018, the inter-annual EVI change rate was negative in 13.6% of the research region and was positive in 86.4% of the research region; high values concentrated in the cities of Guangyuan, Dazhou, Yibin, Luzhou, Leshan, Meishan, and Guang'an in eastern Sichuan, negative values concentrated in Ganzi, Aba Prefecture, and Chengdu; from 2001 to 2018, the overall vegetation improvement in Sichuan Province was good, but the degree of improvement in the northwestern Sichuan plateau and the mountainous region in southwestern Sichuan was significantly lower than that in the eastern Sichuan Basin;(3)the EVI vegetation index in Sichuan Province had increased significantly from 2001 to 2018, and the change in EVI index had low correlation with meteorological factors and high correlation with artificial ecological engineering, indicating that the ecological engineering construction was the main driving force for its change.
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Last Update:
2020-08-25