SPATIOTEMPORAL DYNAMIC CHANGE MONITORING OF NDVI IN MINING AREAS OF DEXING FROM THE PERSPECTIVE OF ECOLOGICAL RESTORATION
The monitoring of the dynamic change of regional vegetation is one of the important means of mine ecological environment restoration and its effect assessment.Based on the GEE(Google Earth Engine)cloud platform,this study extracted the normalized difference vegetation index(NDVI)dataset of the non-ferrous metal mining areas in Dexing year by year from 2012 to 2022 based on MODIS remote sensing data,and used Sen slope analysis,Mann-Kendall test and Hurst index to analyze the characteristics of spatial and temporal dynamic changes and future trends of NDVI in the historical legacy areas before and after the mine production,ecological restoration projects.The results showed that:1)before the implementation of the ecological restoration project from 2012 to 2017,the historical area was in a natural re-greening state,and the rate of change of NDVI was 0.0024/a,and after the implementation of the ecological restoration project from 2018 to 2022,the rate of increase of NDVI was significant and reached 0.0135/a.The change of NDVI in the in-production mining area from 2012 to 2022 generally showed a fluctuating and stable low-level state;2)the highest proportion of significant regional decrease of NDVI in the historical mining area from 2012 to 2017 reached 51.52％,and the highest proportion of increase of NDVI in this area from 2018 to 2022 reached 99.09％.The NDVI in the in-production mining area was dominated by a slightly significant increase from 2012 to 2022;3)through predictive analysis,the historical legacy areas will undergo significant ecological restoration and governance,and continue to show strong and sustained positive development in the future;a certain proportion of the mining areas in the southwest of Dexing will show a reverse trend.This study can provide a reference for the construction of ecological restoration projects and environmental management in mining areas.
NETL
NSTL
万方数据
