北方农牧交错带是我国典型的生态脆弱区,精准评估农牧交错带生态环境质量变化,为区域生态文明建设与实现可持续发展提供合理参考。以农牧交错带的核心区域右玉县为研究区,选取2002年、2008年、2014年、2020年四个不同时期的Landsat影像...北方农牧交错带是我国典型的生态脆弱区,精准评估农牧交错带生态环境质量变化,为区域生态文明建设与实现可持续发展提供合理参考。以农牧交错带的核心区域右玉县为研究区,选取2002年、2008年、2014年、2020年四个不同时期的Landsat影像作为数据基础,在遥感生态指数(RSEI)模型基础上,引入盐度指标(NDSI)构建改进的遥感生态指数(IWRSEI)对2002~2020年右玉县的生态环境质量进行定量评价,通过空间自相关分析生态环境质量时空演变规律。结果表明:(1) 在IWRSEI模型中,第一主成分的荷载值的正负及其排序与RSEI保持一致。此外,IWRSEI模型的第一主成分的特征值贡献率较RSEI提升了1.92%,使得评价结果更贴近实际地表状况,该模型更适合应用于右玉县的生态环境质量评估。(2) 2002~2020年间右玉县的IWRSEI指数平均值为0.509,生态环境质量处于较为良好的状态。IWRSEI指数的年均值呈现一个先增后减的趋势,其中在2014年达到峰值0.550。2002~2014年右玉县的生态环境质量等级分布保持稳定,南部、西部和中部高海拔地带生态环境质量较好,而北部、东北部及中部低海拔区域质量较差;2014~2020年生态环境质量较差的区域面积占比显著上升了16.24%,而质量较好占比减少18.37%,主要变化集中在中低海拔地区。(3) 右玉县生态环境质量存在显著的空间自相关性,局部主要为高–高集聚和低–低集聚,与生态指数分布变化趋于一致。An appropriate reference for the establishment of regional ecological civilization and the achievement of sustainable development is the precisely assessed ecological environment quality changes in the northern agriculture and animal husbandry intertwined belt, which is a typical ecologically fragile area in China. Using Youyu County as the study location, which is the crossbreeding zone’s central region, the data base consisted of Landsat images from the years 2002, 2008, 2014, and 2020. The salinity index (NDSI) was added based on the Remote Sensing Ecological Index (RSEI) model to create the Improved Remote Sensing Ecological Index (IWRSEI), which measures the quality of the ecological environment in Youyu County from 2002 to 2020. Youyu County’s ecological environment quality was assessed quantitatively, and spatial autocorrelation was used to examine the ecological environment quality’s temporal and spatial evolution. The findings demonstrate that (1) in the IWRSEI model, the first main component’s loadings and ordering, both positively and negatively, are consistent with RSEI. Additionally, the IWRSEI model’s first principal component’s eigenvalue contribution rate improved by 1.92% when compared to the RSEI, bringing the evaluation results closer to the real surface conditions and making the model more appropriate for use in Youyu County’s ecological environment quality assessment. (2) Youyu County’s average IWRSEI rating from 2002 to 2020 was 0.509, indicating that the ecological environment is in reasonably excellent condition. The IWRSEI’s yearly average value exhibits an increasing and subsequently declining pattern, peaking at 0.550 in 2014. From 2002 to 2014, Youyu County’s ecological environment quality ratings were distributed steadily, with the high-altitude zones in the south, west, and central regions maintaining the same ecological environment quality grades. The central high-elevation zone has a better ecological environment than the northern, northeastern, and central low-elevation areas;from 2014 to 2020, the percentage of areas with a poorer ecological environment increased significantly by 16.24%, while the percentage of areas with a better ecological environment decreased by 18.37%. The main changes were concentrated in the middle and low-elevation areas. (3) There is a significant spatial autocorrelation in the ecological environment quality of Youyu County, with local areas mainly characterized by high-high clustering and low-low clustering, which is consistent with the distributional changes of the ecological index.展开更多
文摘北方农牧交错带是我国典型的生态脆弱区,精准评估农牧交错带生态环境质量变化,为区域生态文明建设与实现可持续发展提供合理参考。以农牧交错带的核心区域右玉县为研究区,选取2002年、2008年、2014年、2020年四个不同时期的Landsat影像作为数据基础,在遥感生态指数(RSEI)模型基础上,引入盐度指标(NDSI)构建改进的遥感生态指数(IWRSEI)对2002~2020年右玉县的生态环境质量进行定量评价,通过空间自相关分析生态环境质量时空演变规律。结果表明:(1) 在IWRSEI模型中,第一主成分的荷载值的正负及其排序与RSEI保持一致。此外,IWRSEI模型的第一主成分的特征值贡献率较RSEI提升了1.92%,使得评价结果更贴近实际地表状况,该模型更适合应用于右玉县的生态环境质量评估。(2) 2002~2020年间右玉县的IWRSEI指数平均值为0.509,生态环境质量处于较为良好的状态。IWRSEI指数的年均值呈现一个先增后减的趋势,其中在2014年达到峰值0.550。2002~2014年右玉县的生态环境质量等级分布保持稳定,南部、西部和中部高海拔地带生态环境质量较好,而北部、东北部及中部低海拔区域质量较差;2014~2020年生态环境质量较差的区域面积占比显著上升了16.24%,而质量较好占比减少18.37%,主要变化集中在中低海拔地区。(3) 右玉县生态环境质量存在显著的空间自相关性,局部主要为高–高集聚和低–低集聚,与生态指数分布变化趋于一致。An appropriate reference for the establishment of regional ecological civilization and the achievement of sustainable development is the precisely assessed ecological environment quality changes in the northern agriculture and animal husbandry intertwined belt, which is a typical ecologically fragile area in China. Using Youyu County as the study location, which is the crossbreeding zone’s central region, the data base consisted of Landsat images from the years 2002, 2008, 2014, and 2020. The salinity index (NDSI) was added based on the Remote Sensing Ecological Index (RSEI) model to create the Improved Remote Sensing Ecological Index (IWRSEI), which measures the quality of the ecological environment in Youyu County from 2002 to 2020. Youyu County’s ecological environment quality was assessed quantitatively, and spatial autocorrelation was used to examine the ecological environment quality’s temporal and spatial evolution. The findings demonstrate that (1) in the IWRSEI model, the first main component’s loadings and ordering, both positively and negatively, are consistent with RSEI. Additionally, the IWRSEI model’s first principal component’s eigenvalue contribution rate improved by 1.92% when compared to the RSEI, bringing the evaluation results closer to the real surface conditions and making the model more appropriate for use in Youyu County’s ecological environment quality assessment. (2) Youyu County’s average IWRSEI rating from 2002 to 2020 was 0.509, indicating that the ecological environment is in reasonably excellent condition. The IWRSEI’s yearly average value exhibits an increasing and subsequently declining pattern, peaking at 0.550 in 2014. From 2002 to 2014, Youyu County’s ecological environment quality ratings were distributed steadily, with the high-altitude zones in the south, west, and central regions maintaining the same ecological environment quality grades. The central high-elevation zone has a better ecological environment than the northern, northeastern, and central low-elevation areas;from 2014 to 2020, the percentage of areas with a poorer ecological environment increased significantly by 16.24%, while the percentage of areas with a better ecological environment decreased by 18.37%. The main changes were concentrated in the middle and low-elevation areas. (3) There is a significant spatial autocorrelation in the ecological environment quality of Youyu County, with local areas mainly characterized by high-high clustering and low-low clustering, which is consistent with the distributional changes of the ecological index.
