Driving Analysis And Climate Response Of Vegetation Cover Change In Inner Mongolia

In recent decades,global climate change has received attention from the academic community.The Inner Mongolia is an important ecological barrier in northern China.The restoration and construction of vegetation has an important impact on the ecological environment of the Inner Mongolia Autonomous Region,and the climate has a very important impact on the vegetation coverage.Therefore,studying the changes in the vegetation coverage,the driving factors,and the response to the climate are important factors for the construction of China.Based on MOD13Q1 data from 2001 to 2018,this paper uses the spatial statistics to study the characteristics of the spatiotemporal evolution of vegetation and its changing trends.The time series information entropy is used to verify the intensity of changes in vegetation coverage in Inner Mongolia.Using climate and soil texture data,socio-economic data,topographic and geomorphological data,road traffic,mining area and other data,construct OLS model and GWR model to study and analyze the driving factors of vegetation coverage in Inner Mongolia Autonomous Region,and explore the different factors for vegetation coverage Impact.Finally,combining the climate characteristics of Inner Mongolia Autonomous Region,the response of vegetation coverage to climate is analyzed.The main conclusions reached are:(1)In terms of the average vegetation coverage in Inner Mongolia in the past 18 years,the vegetation coverage in Inner Mongolia Autonomous Region shows a distribution pattern of high east and low west,which is roughly the same as the local ecological distribution of vegetation.Different land use types have different effects on the growth of vegetation.The average vegetation coverage of forest land is the highest,followed by cultivated land,followed by forest land.Unused land is mostly desert and other areas,and the vegetation coverage is the lowest.The vegetation coverage of the Inner Mongolia Autonomous Region has been greatly improved in the past 18 years.This is inseparable from the support of relevant national policies and the development concept of green mountains and green mountains.(2)The annual average coverage in Inner Mongolia and the overall coverage are on the rise.The average coverage rate fluctuated between 42.87% and 53.13%,and the maximum average coverage rate was 53.13%,which appeared in 2018.The minimum average vegetation coverage was 42.87% in 2001.Looking at the overall 18-year time span,the average annual FVC in Inner Mongolia has shown a gentle upward trend,with an average rate of 0.57% per year.The area with reduced vegetation is mostly in the central region,and the increased area is mostly distributed in the provincial boundaries of Inner Mongolia.At the edge,the intensity of change is relatively gentle,showing a slight increase.(3)By screening and processing the driving factors,selecting 17 influential factors closely related to changes in vegetation cover,diagnosing multicollinearity and using principal component analysis to eliminate multicollinearity among variables,and optimizing to obtain 5 affecting changes in vegetation cover Comprehensive leading factor.The comparative analysis of least squares regression model(OLS),features and geographic weighted regression model(GWR).The GWR model shows that the driving factors have a heterogeneous effect on the vegetation cover changes in the Inner Mongolia,with a higher degree of fitting,which can better deal with spatial instability and better explain the driving factors of vegetation cover changes in the study area.Based on the analysis of the influence of different dominant influencing factors on the changes in vegetation cover and their spatial differences in Inner Mongolia,it is found that the spatial influencing factors of vegetation cover changes and their impact intensities are quite different,and the spatial distribution of each factor coefficient is different.The mechanism of land relationship change on vegetation cover is complicated.(4)The annual average temperature and annual precipitation show a gentle upward trend,and the temperature distribution is affected by latitude,terrain and altitude.The annual precipitation showed a clear upward trend.The highest annual precipitation reached 416.99 mm in 2012;the lowest in 2009 was only 254.96 mm.The influence of temperature and precipitation on vegetation coverage has a certain lag,and the partial correlation coefficient between FVC and temperature in Inner Mongolia has not shown obvious spatial distribution differences.The correlation is positive or negative for each vegetation zone.The partial correlation coefficients between vegetation cover and precipitation in different vegetation areas except for the cold temperate coniferous forest area showed a negative correlation,the other areas showed a positive correlation,and the positive correlation was most obvious in the temperate steppe area,which reflects the positive effect of precipitation on vegetation relationship.