基于RSEI的长时序区域生态安全格局构建——以太行山区河北段为例

Construction of Long Term Regional Ecological Security Pattern Based on RSEI-taking the Hebei Section of the Taihang Mountains as an Example

以太行山区河北段为研究对象,计算遥感生态指数(Remote Sensing Ecological Index,RSEI),进而识别生态源地,选取土地利用类型、归一化植被指数、高程、坡度等多源空间数据进行综合阻力评价,采用电路理论模型提取生态廊道和生态夹点,构建“源地-廊道-节点”的长时序区域生态安全格局。结果表明:(1)研究区2002年、2007年、2012年、2017年、2021年的RSEI均值分别为0.507、0.538、0.554、0.493、0.541,20年间RSEI呈现“上升-下降-上升”的变化趋势;(2)研究区源地总面积逐期增加,初期至末期面积增加5705 km^(2),面积占比由2.66%增加至18.56%,源地斑块RSEI均值由0.774上升为0.834;(3)研究区主要生态廊道呈现南北纵向分布,研究末期识别生态源地16个,生态廊道21条,生态夹点5个。

Taking the Hebei section of the Taihang Mountains as the research object,the Remote Sens-ing Ecological Index(RSEI)is calculated to identify the ecological source area.Multiple spatial data sources such as the land use type,normalized vegetation index,elevation,and slope are selected for comprehensive resistance evaluation.The circuit theory model is used to extract ecological corridors and pinch points,and a long-term regional ecological security pattern of“source area corridor node”is con-structed.The results show that:(1)The average RSEI of the study area in 2002,2007,2012,2017,and 2021 are 0.507,0.538,0.554,0.493,and 0.541,respectively,and the RSEI shows a trend of“rising-falling-rising”over the past 20 years;(2)The total area of the source area in the research area increases gradually,with an increase of 5705 km^(2)from the initial stage to the final stage.The proportion of area increases from 2.66%to 18.56%,and the average RSEI of the source patches increases from 0.774 to 0.834;(3)The main ecological corridors in the research area are distributed vertically from north to south.At the end of the study,16 ecological source areas,21 ecological corridors,and 5 eco-logical pinch points are identified.