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On the change of vegetation and water indicators and driving forces in Yanhu district of Yuncheng city in the past 31 years
Time: 2021-09-10 Counts:

doi:10.16186/j.cnki.1673-9787.2019120111

Received:2019/12/31

Revised:2020/04/26

Published:2021/09/15

On the change of vegetation and water indicators and driving forces in Yanhu district of Yuncheng city in the past 31 years

LIU Chang1, MA Chao1,2

1.School of Surveying and land Information Engineering,Henan Polytechnic University,Jiaozuo  454000,Henan,China;2.Key Laboratory of Spatio-temporal Information and Ecological Restoration of Mines （ Ministry of Natural Resources） ，Henan Polytechnic University,Jiaozuo  454000,Henan,China

Abstract:In order to study the change trend of land vegetation biomass and area of Yanhu lake in time series of Yanhu district in Yuncheng city,based on the Landsat 'TM/ETM +/OLl data（1987—2017） and the average annual temperature and precipitation data of meteorological stations around the Yanhu district of Yuncheng city（1987—2015）,the normalized difference vegetation index（NDVI）and normalized difference water body index（NDWI） in the area were quantified and conducted variance analysis and correlation analysis.The results showed that in the past 31 years,the total NDVI value in the study area had a significant growth trend,linear fit growth rate slope=20.509，and the vegetation coverage has been improved continuously.From 2002 to 2017,the area of Yanhu lake decreased year by year,and the total area decreased by 16.1%.The atmospheric precipitation played a decisive role in the Yanhu district.The area of Yanhu lake was significantly correlated with precipitation（r =0.7464,P <0.01） from 1987 to 2014,but not with temperature.The NDVI（1987 —2017） of thelandsurfaceinthewholeregionincreasedstable，withaconcentrationofmedium and low fluctuation,that was ，0.2 <Cv ≤ 0.6,accounting for 80.68% of the study area； The NDVI and NDWI values in Yanhu lake showed high fluctuation（Cv>0.8）,accounting for 49.73% and 45.19% respectively.The NDVI index,which was closely related to agricultural planting activities in the Yanhu district,and the NDWI index,which was closely related to salt chemical production activities,were showing a positive trend.

Key words:Yanhu district in Yuncheng city;normalized difference water index;normalized difference vegetation index;coefficient of variation;climate change

  运城市盐湖区31年植被与水体指标变化及驱动力分析_刘畅.pdf

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