Ecological environment assessment of three-river confluence in Yibin City using improved remote sensing ecological index
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摘要: 城市扩张是宜宾市近年来的主要特征,研究其对生态环境的影响,对城市发展与生态保护具有重要意义。为了更好地评价城市扩张对生态的影响,基于遥感生态指数(remote sensing ecological index, RSEI),构建归一化不透水面和裸土指数替代原有建筑指数作为干度指标,建立了改进型遥感生态指数(improved remote sensing ecological index, IRSEI),耦合对生态具有重要影响的绿度、湿度、温度及改进后的干度指标信息,利用主成分分析法及相关性对IRSEI进行了分析,建立基于IRSEI的宜宾市三江汇合区生态评价模型,对该地区20132020年间生态环境做出分析评价。结果表明: IRSEI能够更加精准地反映出干度对生态造成的负面影响,较RSEI在第一主成分分量中能够集中更多有用信息,对城市生态环境质量评测具有更好的适用性。2013年,该区域IRSEI为0.54,生态总体状况一般,原因在于城区扩张严重,破坏了原有植被; 2017年,IRSEI为0.67,退耕还林的持续推进以及城区生态的恢复,使得绿度明显上升,因此生态状况较2013年大为好转; 2020年,IRSEI为0.63,绿度、湿度以及干度基本与2013年持平,但由于城市扩张带来的热岛效应,温度较2017年有所上升,因此生态水平轻微下降。
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关键词:
- 改进型遥感生态指数(IRSEI) /
- 主成分分析 /
- 相关性 /
- 宜宾三江汇合区 /
- 生态评价
Abstract: Urban expansion is the main characteristic of Yibin City in recent years, and the study of its impacts on ecology is significant for urban development and ecological protection. To assess the impacts of urban expansion on the ecology more accurately, this study established an improved remote sensing ecological index (IRSEI) by using the impervious surface area index as the dryness index to replace the original building index. The IRSEI coupled the improved dryness index and the indices greatly influencing the ecology, such as greenness, humidity, and temperature. This study analyzed the IRSEI using principal component analysis and correlation and established an IRSEI-based ecological assessment model of the three-river (i.e., the Jinsha River, Minjiang River, and Yangtze River) confluence in Yibin City. Then, this study analyzed and assessed the ecological environment of the confluence in 2013—2020. The results are as follows. The IRSEI can more accurately reflect the negative impacts of the dryness index on the ecology of the confluence. It can concentrate more useful information in the first principal component than the RSEI and can better apply to the quality assessment of urban ecological environment. In 2013, the IRSEI of the confluence was 0.54, indicating the moderate ecological status overall. The reason is that the original vegetation was destroyed by serious urban expansion. In 2017, the IRSEI was 0.67. The greenness was significantly improved by the continuous advancement of returning farmland to forests and the restoration of urban ecology, which is the reason that the ecology has greatly improved in 2017 compared to 2013. In 2020, the IRSEI was 0.63. The greenness, humidity, and dryness in 2020 were roughly the same as those in 2013, while the temperature rose in 2020 compared to 2017 due to the heat island effect induced by urban expansion. This is the reason for the slight decline in the ecological level in 2020. -
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