Evolution Characteristics of Vegetation Coverage in Central and Western Inner Mongolia under the Background of Climate Change
The dynamic evolution of vegetation cover can effectively reflect the changes in the regional ecological environment.To investigate the spatiotemporal characteristics of vegetation cover and its response to climate change in five leagues in central and western Inner Mongolia,we used MODIS NDVI data and concurrent climate factor data(average temperature,cumulative precipitation,average sunshine hours,average relative humidity),along with analytical techniques such as Theil-Sen Median trend analysis,Mann-Kendall test(MK),Hurst exponent,and partial correlation analysis to analyze the spatiotemporal variations of vegetation cover and climate factors from 2000 to 2021,as well as the response of vegetation cover to climate change.The results indicate that the average vegetation cover in the five leagues of central and western Inner Mongolia was 0.321 from 2000 to 2021,which was relatively low.During the 22-year period,the vegetation cover showed a fluctuating upward trend,with a growth rate of 0.4%.The distribution pattern of vegetation cover in the study area showed a higher cover in the east and lower cover in the west,with low-coverage areas accounting for 53.2%and moderate-to-high-coverage areas accounting for approximately 10%of the total area.The average Sen slope of the vegetation cover in the study area was 0.004 from 2000 to 2021,indicating an overall increasing trend in vegetation cover.Areas with improved vegetation cover accounted for 89.1%of the study area,whereas areas with degraded vegetation accounted for 10.6%.The mean Hurst exponent during the study period was 0.423.Combined with the Sen trend,a steady increase in future vegetation cover was predicted,with 48.4%of the region showing no significant vegetation improvement or degradation and 30.6%of the area dominated by vegetation improvement.The average temperature and cumulative precipitation exhibited increasing trends,whereas the average sunshine hours and average relative humidity exhibited decreasing trends from 2000 to 2021.Vegetation cover showed no significant correlation with the average temperature,with only 14.7%of the area showing a significant positive correlation(p<0.05).The vegetation cover and cumulative precipitation were positively correlated,with 98.1%of the area being positively correlated.However,the relationships between vegetation cover,sunshine hours,and relative humidity were dominated by non-significant correlations.
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