| Response of enhanced vegetation index (EVI) to climatic factors in different ecological division of Shanxi Province |
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| DOI：10.7606/j.issn.1000-7601.2016.06.40 |
| Key Words: EVI ecological division ET climatic factors Shanxi Province |
| Author Name | Affiliation | | WANG Hu-wei | College of Tourism and Environment, Shaanxi Normal University, Xi’an, Shaanxi 710062, China | | ZHANG Fu-ping | College of Tourism and Environment, Shaanxi Normal University, Xi’an, Shaanxi 710062, China | | YAN Yu-chao | College of Tourism and Environment, Shaanxi Normal University, Xi’an, Shaanxi 710062, China | | LEI Sheng-jian | College of Tourism and Environment, Shaanxi Normal University, Xi’an, Shaanxi 710062, China |
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| Abstract: |
| Using the data of MODIS EVI, monthly mean air temperature and precipitation from 27 weather stations and transpiration from MOD16 during 2000 to 2014, analyzed the vegetation cover change in recent 15 years in Shanxi Province and its response feature to temperature，precipitation and evapotranspiration. The result showed that： (1) Overall the vegetation cover showed an upward trend, the increasing speed was 2.6%·10a-1. In the different ecological division, the eastern mountain area Ⅱ>the central basin Ⅲ>the western mountain area Ⅳ>the north Shanxi mountain area Ⅰ>the west Shanxi loess Ⅴ. (2) The vegetation cover in Shanxi Province possessed rather large regional difference. Among them and the EVI in southeast part was obvious higher than the northwest part. The EVI frequency chart was appeared “unimodal structure”. The most parts of province was showed unchange or increasing trend，the notable area ratio was 25.95% and the degradation area ratio was 1.04%． (3) The yearly EVI with the precipitation and evapotranspiration was assumed positive correlation, negative correlation with the temperature, The monthly EVI with the temperature and evapotranspiration was showed significantly positive correlation. The correlation between evapotranspiration and EVI was better than the single factor as precipitation and temperature. Also the precipitation with EVI change was existed a threshold value. (4) From growing season considered the evapotranspiration with EVI, we can known that from spring to summer each big ecological region total showed positive correlation and strengthened gradually. In autumn, all other natural areas were negative correlation except the middle part of the central basin Ⅲ. |
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