| 摘要: 评价生态环境质量，分析生态环境变化的根本原因，是区域生态管理的重要内容。本文利用Google Earth Engine (GEE)平台，计算漓江流域1991、2001、2011和2021年的遥感生态指数(RSEI)，并采用空间自相关方法研究漓江流域生态环境质量的时空变化特征。此外，利用地理探测器定量分析生态环境质量的影响因素及其相互作用。结果表明: ①1991—2021年，漓江流域生态环境呈现出先显著改善后略微退化的趋势; 生态环境质量优良区面积增加了19.69% (3406.57 km2)，生态环境质量一般差区面积减少了10.76% (1860.30 km2)。(2)从空间上看，漓江流域生态环境质量呈现中部低四周高的格局，其中，桂林市区、平乐县、灵川县生态环境质量较差，永福县、恭城瑶族自治县(东部和西北部)等高海拔地区生态环境质量逐步改善。(3) 1991—2021年，漓江流域生态环境质量存在显著正相关关系，高-高集聚区以林地和草地为主，生态环境质量较好; 低-低集聚区以耕地和建设用地为主，生态环境质量较差。(4)年平均降水量和年平均气温对漓江流域生态环境的影响最为显著。流域生态环境质量受自然因素和人为因素共同影响，这些因素之间的相互作用对生态环境质量产生重大的影响。研究结果旨在加强对漓江流域生态环境演变的认识，为该地区生态环境相关决策和管理提供科学指导。 |
| 关键词: 生态环境质量 RSEI 驱动因子 GEE 漓江流域 |
| 中图分类号:P426.2 |
| 基金项目:This research was supported by the Guangxi Natural Science Foundation (approval no.: 2020GXNSFAA297266), Doctoral Research Foundation of Guilin University of Technology (approval no.: GUTQDJJ2007059) and Guangxi Hidden Metallic Mineral Exploration Key Laboratory. |
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| Ecological environmental quality evaluation and driving factor analysis of the Lijiang River Basin Based on google earth engine |
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WEI Xi1, YAND Dazhi2, CAI Xiangwen1, SHAO Ya1, TANG Xianglin1
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1.College of Earth Sciences,Guilin University of Technology;2.Key Laboratory of Land Surface Pattern and Simulation,Institute of Geographic Sciences and Natural Resources Research,Chinese Academy of Sciences
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| Abstract: It is important for regional ecological management to evaluate the quality of the ecosystem and analyze the underlying causes of ecological changes. Utilizing the Google Earth Engine (GEE) platform, Remote Sensing Ecological Index (RSEI) was calculated for the Lijiang River Basin for 1991, 2001, 2011 and 2021. Spatial autocorrelation analysis was employed to investigate the spatiotemporal variations in the ecological environmental quality of the Lijiang River Basin. Furthermore, geographic detectors were utilized to quantitatively analyze the influencing factors and their interaction effects on the ecological environmental quality. The results verify that: (1) From 1991 to 2021, the ecological environment of the Lijiang River Basin demonstrated significant improvement, followed by a slight degradation. The area with good and excellent ecological environmental quality increased by 19.69% (3406.57 km2), while the area with fair and poor ecological environmental quality decreased by 10.76% (1860.30 km2). (2) Spatially, the ecological environmental quality of the Lijiang River Basin exhibits a pattern of low quality in the central part and high quality in the periphery. Specifically, Guilin urban area, Pingle County, and Lingchuan County demonstrate poor ecological environmental quality, while high-altitude areas in Yongfu County, Gongcheng Yao Autonomous County (eastern and northwestern parts), and others exhibit gradual improvement. (3) From 1991 to 2021, a significant positive correlation was observed in the ecological environmental quality of the Lijiang River Basin. Areas with high-high agglomeration are predominantly with forests and grasslands, indicating good ecological environmental quality, while areas with low-low agglomeration are dominated by cultivated land and construction land, indicating poor ecological environmental quality. (4) The annual average precipitation and annual average temperature exert the most significant influence on the ecological environment of the Lijiang River Basin. The ecological environmental quality of the basin is shaped by both natural and human factors, and the interactions between these factors amplify their impact on the ecological environmental quality. The research findings aim to enhance understanding of the evolution of the ecological environment in the Lijiang River Basin and provide scientific guidance for decision-making and management related to ecology in the region. |
| Keyword: Ecological environmental quality Driving factors RSEI GEE Lijiang River Basin |