Changes of vegetation coverage and their response to topographical factors in national key ecological function regions： a case study of Changyang County in Hubei Province， China
PAN Fangjie1， WANG Hongzhi2， FENG Bing1， SONG Mingjie3， CHEN An4
1.School of Management， Wuhan Institute of Technology， Wuhan 430205，China；2. College of Urban & Environmental Sciences，Central China Normal University，Wuhan 430079，China；3.College of Public Administrative，Central China Normal University，Wuhan 430079，China；4.Yichang Institute of Environmental Protection，Yichang 443000，China
Abstract：Monitoring of regional vegetation cover change is the basis of researching the carrying capacity of resources and environment，which is crucial for regional sustainable development.This study is based on the NDVI data and the information of vegetation coverage estimated by the pixel binary model method to analyze the temporal and spatial evolution characteristics of fractional vegetation coverage and its response to topographical factors from 2000 to 2015.The data was analyzed using bias analysis， coefficient of variation and trend analysis with the coefficient corrected by topography. The main results are as follows.1) The vegetation coverage was at a relatively high level as a whole from 2000 to 2015， showing a small fluctuation increasing trend， with an average annual growth rate of 0.12%. The medium-high coverage area is the largest， with an area of 2,240.66 km2， and the high-coverage area is 498.76 km2， accounting for more than 80% of the total study area together. 2) The variation degree of vegetation coverage was generally stable from 2000 to 2015， and the area of stable vegetation accounted for 82.84% of the total study area. The area of vegetation improvement type is larger than that of vegetation degradation type， accounting for 13.07% and 4.08% respectively， which can play an important role in maintaining regional ecological security to a large extent. 3) As the elevation increases， the type of vegetation degradation first decreases and then increases， and it is the dominant type in the range of greater than 1 250 m. The stable type of vegetation coverage first increased and then decreased gradually， and the advantages were obvious within the elevation of 500-1 750 m. While the improved vegetation type showed a continuous decreasing trend， only showing dominant distribution within the elevation less than 500 m. The slope has a greater influence on the distribution of vegetation degradation types， and the dominant degree is the most obvious in the range of 0°-15°. When the slope is greater than 25°， the stable and improved vegetation types show a certain degree of dominant distribution.The change of vegetation coverage is significantly in different slope directions. As the slope direction changes from shade to sunny， the distribution of improved vegetation types increases showing a dominant distribution， while the distribution of stable vegetation types decreases. This research provide a reference for the ecological environment management and ecological protection of the water and soil conservation ecological function zone in the Three Gorges Reservoir Area of national key ecological function zone， to a certain extent.
潘方杰,王宏志,冯 兵,宋明洁,陈 安. 国家重点生态功能区植被覆盖度变化及其对地形因子的响应——以湖北省长阳县为例[J]. 华中师范大学学报(自然科学版), 2021, 55(3): 442-452.
PAN Fangjie,WANG Hongzhi,FENG Bing,SONG Mingjie,CHEN An. Changes of vegetation coverage and their response to topographical factors in national key ecological function regions： a case study of Changyang County in Hubei Province， China. journal1, 2021, 55(3): 442-452.
2021, Vol. 55 
