生态环境监测与评价是提高生态环境质量的重要基础工作。本文以夏津县为研究对象,选取2010年和2020年2期Landsat卫星影像为研究数据,基于耦合NDVI、NDSI、WET、LST指标的生态环境质量评价指数RSEI综合分析评价研究区域2010年~2020年城...生态环境监测与评价是提高生态环境质量的重要基础工作。本文以夏津县为研究对象,选取2010年和2020年2期Landsat卫星影像为研究数据,基于耦合NDVI、NDSI、WET、LST指标的生态环境质量评价指数RSEI综合分析评价研究区域2010年~2020年城市化建设对生态环境的影响。结果显示:夏津县区域整体环境质量大幅度提高、城市及周边地区生态环境质量等级由第三级“良好”改善为第四级“优秀”、城区周边地区植被覆盖度提高、湿度指数提高、热度指数提高、干度指数下降。Ecological environment monitoring and evaluation is an essential foundational task for improving environmental quality. This study focuses on Xiajin County and utilizes two Landsat satellite images from 2010 and 2020 as the research data. Based on the integrated analysis of the Remote Sensing Ecological Index (RSEI), which couples NDVI, NDSI, WET, and LST indices, this paper evaluates the impact of urbanization on the ecological environment in the region from 2010 to 2020. The results show that the overall environmental quality of Xiajin County significantly improved. The ecological environment quality of urban and surrounding areas upgraded from the third level “Good” to the fourth level “Excellent”. The vegetation coverage around urban areas increased, the wetness index improved, the heat index rose, and the dryness index decreased.展开更多
The Loess Plateau(LP),one of the most ecologically fragile regions in China,is affected by severe soil erosion and environmental degradation.Despite large-scale ecological restoration efforts made by Chinese governmen...The Loess Plateau(LP),one of the most ecologically fragile regions in China,is affected by severe soil erosion and environmental degradation.Despite large-scale ecological restoration efforts made by Chinese government in recent years,the region continues to face significant ecological challenges due to the combined impact of climate change and human activities.In this context,we developed a kernal Remote Sensing Ecological Index(kRSEI)using Moderate Resolution Imaging Spectroradiometer(MODIS)products on the Google Earth Engine(GEE)platform to analyze the spatiotemporal patterns and trends in ecological environmental quality(EEQ)across the LP from 2000 to 2022 and project future trajectories.Then,we applied partial correlation analysis and multivariate regression residual analysis to further quantify the relative contributions of climate change and human activities to EEQ.During the study period,the kRSEI values exhibited significant spatial heterogeneity,with a stepwise degradation pattern in the southeast to northwest across the LP.The maximum(0.51)and minimum(0.46)values of the kRSEI were observed in 2007 and 2021,respectively.Trend analyses revealed a decline in EEQ across the LP.Hurst exponent analysis predicted a trend of weak anti-persistent development in most of the plateau areas in the future.A positive correlation was identified between kRSEI and precipitation,particularly in the central and western regions;although,improvements were limited by a precipitation threshold of 837.66 mm/a.A moderate increase in temperature was shown to potentially benefit the ecological environment within a certain range;however,temperature of-1.00°C-7.95°C often had a negative impact on the ecosystem.Climate change and human activities jointly influenced 65.78%of LP area on EEQ,primarily having a negative impact.In terms of contribution,human activities played a dominant role in driving changes in EEQ across the plateau.These findings provide crucial insights for accurately assessing the ecological state of the LP and suggest the design of future restoration strategies.展开更多
文摘生态环境监测与评价是提高生态环境质量的重要基础工作。本文以夏津县为研究对象,选取2010年和2020年2期Landsat卫星影像为研究数据,基于耦合NDVI、NDSI、WET、LST指标的生态环境质量评价指数RSEI综合分析评价研究区域2010年~2020年城市化建设对生态环境的影响。结果显示:夏津县区域整体环境质量大幅度提高、城市及周边地区生态环境质量等级由第三级“良好”改善为第四级“优秀”、城区周边地区植被覆盖度提高、湿度指数提高、热度指数提高、干度指数下降。Ecological environment monitoring and evaluation is an essential foundational task for improving environmental quality. This study focuses on Xiajin County and utilizes two Landsat satellite images from 2010 and 2020 as the research data. Based on the integrated analysis of the Remote Sensing Ecological Index (RSEI), which couples NDVI, NDSI, WET, and LST indices, this paper evaluates the impact of urbanization on the ecological environment in the region from 2010 to 2020. The results show that the overall environmental quality of Xiajin County significantly improved. The ecological environment quality of urban and surrounding areas upgraded from the third level “Good” to the fourth level “Excellent”. The vegetation coverage around urban areas increased, the wetness index improved, the heat index rose, and the dryness index decreased.
基金funded by the National Natural Science Foundation of China(42361017)the Gansu Provincial Science and Technology Program-Special Program for Key Research and Development(R&D)on Ecological Civilization Construction in Gansu Province(24YFFA050)the Gansu Agricultural University-Gansu Provincial Academy of Natural Resources Planning Joint Graduate Training Base Project(GAU2024-003)。
文摘The Loess Plateau(LP),one of the most ecologically fragile regions in China,is affected by severe soil erosion and environmental degradation.Despite large-scale ecological restoration efforts made by Chinese government in recent years,the region continues to face significant ecological challenges due to the combined impact of climate change and human activities.In this context,we developed a kernal Remote Sensing Ecological Index(kRSEI)using Moderate Resolution Imaging Spectroradiometer(MODIS)products on the Google Earth Engine(GEE)platform to analyze the spatiotemporal patterns and trends in ecological environmental quality(EEQ)across the LP from 2000 to 2022 and project future trajectories.Then,we applied partial correlation analysis and multivariate regression residual analysis to further quantify the relative contributions of climate change and human activities to EEQ.During the study period,the kRSEI values exhibited significant spatial heterogeneity,with a stepwise degradation pattern in the southeast to northwest across the LP.The maximum(0.51)and minimum(0.46)values of the kRSEI were observed in 2007 and 2021,respectively.Trend analyses revealed a decline in EEQ across the LP.Hurst exponent analysis predicted a trend of weak anti-persistent development in most of the plateau areas in the future.A positive correlation was identified between kRSEI and precipitation,particularly in the central and western regions;although,improvements were limited by a precipitation threshold of 837.66 mm/a.A moderate increase in temperature was shown to potentially benefit the ecological environment within a certain range;however,temperature of-1.00°C-7.95°C often had a negative impact on the ecosystem.Climate change and human activities jointly influenced 65.78%of LP area on EEQ,primarily having a negative impact.In terms of contribution,human activities played a dominant role in driving changes in EEQ across the plateau.These findings provide crucial insights for accurately assessing the ecological state of the LP and suggest the design of future restoration strategies.
