Forest and Grassland Resources Research >
Analysis on the Changing Trend of Vegetation EVI and Its Influencing Factors in Qinghai Province from 2000 to 2015
Received date: 2017-10-19
Revised date: 2017-11-21
Online published: 2020-09-28
Based on the MODIS EVI data of Qinghai Province from 2000 to 2015,this paper analyzed the spatial-temporal change pattern of vegetation EVI in Qinghai Province,and revealed the correlation between climatic factors and vegetation EVI and discussed the effect of human activities on vegetation growth and development.The results showed that the EVI of Qinghai Province increased from 2000 to 2015 (0.0180/10a),which could be divided into rapid growth period (2000-2004),fluctuation period (2005-2012) and slight decline period (2013-2015);EVI showed a significant increase in the area ratio of 51.58%,showing a significant reduction in the region accounted for 20.64%,27.78% of the regional EVI did not significantly change or basically unchanged,of which the increase rate of vegetation EVI and the area of vegetation improvement in Haixi area were the largest.There was a positive correlation between temperature and precipitation and EVI,and the proportion of positive correlation was 60.67% and 69.50% respectively.The effect of precipitation on vegetation growth and development was slightly higher than that of temperature.The reduction of carrying capacity and the increase of ecological engineering area have promoted the growth and development of vegetation to a certain extent,but it is limited and preliminary compared with climate change.
Key words： Qinghai Province; EVI; vegetation changes
Hao MA . Analysis on the Changing Trend of Vegetation EVI and Its Influencing Factors in Qinghai Province from 2000 to 2015[J]. Forest and Grassland Resources Research, 2017 , 0(6) : 77 -83 . DOI: 10.13466/j.cnki.lyzygl.2017.06.014
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