Temporal And Spatial Change And Its Influencing Factors Of Vegetation Cover In Fujian Province

As the main element of surface land cover,vegetation has an important impact on global material circulation and energy flow and global response.NDVI can reflect vegetation coverage information in large-scale spatial range?By studying the change of NDVI and its influencing factors,it seems to be one of the important contents for scholars at home and abroad to discuss the specific situation of regional vegetation cover change.In order to reveal the spatial and temporal evolution of vegetation cover and its influencing factors in Fujian Province,this study combines RS and GIS to discuss the following four aspects.(1)Based on the MODIS MOD13Q1 NDVI data set from 2000 to 2017,the temporal and spatial dynamic changes of NDVI in Fujian Province were analyzed on three time scales: interannual,seasonal and intra-annual,using the methods of maximum synthesis,trend analysis and stability analysis.(2)Combining vegetation NDVI with topographical factors,the correlation between NDVI and topography is discussed from three angles: elevation,slope and aspect.(3)Based on the monthly data sets of 22 meteorological stations in Fujian Province from 2000 to 2017,six meteorological elements,such as temperature,precipitation,barometric pressure,water pressure,relative humidity and sunshine hours,were selected to correlate with NDVI.The effects of main meteorological factors on vegetation change were discussed from the regional and site scales.(4)The impact of human factors on NDVI was analyzed by fusing NDVI with land type data,GDP and population density data.The results showed that:(1)From 2000 to 2017,the growth rate of NDVI in Fujian Province was 0.0032/a,with an obvious upward trend.The growth of NDVI showed seasonal differences,and the stability of vegetation change was high.(2)The NDVI growth trend is the highest in the 500~1000m area.The NDVI increases with the increase of altitude,and the stability increases gradually.The vegetation in the gentle slope and slope area shows a steady increase.The NDVI of the semi-sunny slope is the highest and the rate of increase is the largest.(3)The interannual NDVI in Fujian Province is positively correlated with temperature,precipitation,water pressure and relative humidity during the same period.In terms of site scale,the correlation between NDVI and meteorological factors at each site has different degrees of response and lag.(4)The NDVI of grassland,cultivated land and forest-land in Fujian Province showed different degrees of improvement.In addition,except for Xiamen City,the GDP of each district and city showed a high positive correlation with NDVI;NDVI and population of Quzhou City and Quanzhou City The density showed a significant positive correlation,and Ningde City showed a significant negative correlation.