Abstract: This paper inverses the fractional vegetation cover(FVC) in Hefei City from 2008 to 2019 using the dimidiate pixel model based on Landsat TM/ETM+/OLI remote sensing images. Then, the Markov transfer matrix and difference image algorithm are applied for quantitative analysis of the FVC change characteristics at different levels in Hefei City from 2008 to 2019. The results show that the average value of FVC in Hefei City in 2008, 2011, 2013, 2015, 2017 and 2019 is 60.9%, 48.4%, 56.0%, 48.0%, 63.0% and 61.2%, respectively. The annual average FVC fluctuates greatly, but the overall trend is on the rise; the change of FVC in Hefei City is mainly at the level of stable areas, the peripheral FVC of the main urban area has a trend of degradation, while those of Changfeng County, main urban area and Lujiang County increase significantly; the overall change trend of FVC at all levels in the study area is benign, and the FVC is expected to increase in the future; the temperature in Hefei City shows an upward trend from 2008 to 2019, while the precipitation shows a downward trend, with an overall performance of warming and drying. And this trend can promote the increase of FVC in Hefei City, in which the annual average temperature is the main factor affecting the evolution of FVC.
Keywords: fractional vegetation cover(FVC); dimidiate pixel model; spatiotemporal variation characteristic; meteorological factor
合肥工业大学学报自科版