黑岱沟和哈尔乌素矿区2000—2020年生态环境质量时空格局与演变特征分析

分析黑岱沟矿区、哈尔乌素矿区2000—2020年生态环境时空变化特征，掌握生态环境质量改变诱因，为矿区进一步的生态治理决策提供科学依据。筛选出2000—2020年8月的共21期Landsat遥感影像，去除有云像元，掩膜水体信息，得到归一化植被指数(normalized difference vegetation index, NDVI)作为绿度指标、湿度(wet, WET)作为湿度指标、热度(land surface temperature, LST)作为热度指标、干度(normalized difference building and soil index, NDSI)作为干度指标并进行主成分分析(principal component analysis, PCA)构建遥感生态指数(remote sensing ecological index, RSEI),从而对2000—2020年矿区生态环境质量进行评价。结果表明：2000—2020年矿区扰动区及恢复区RSEI指数呈前期略有下降，后期整体上升状态。21年来矿区生态环境质量经历恶化-恢复-稳定的发展趋势，其中2000—2010年...

Analysis on Spatio-temporal pattern change characteristics of Eco-environmental quality in Heidaigou and Harwusu Mining area based on RSEI

The change characteristics of eco-environmental quality of Heidaigou mining area and Harwusu mining area from 2000 to 2020 were analyzed, in order to grasp the inducement of eco-environment quality change and provide scientific basis for further ecological management decision-making in mining area.?Google Earth Engine platform filter a total of 21 Landsat remote sensing images from 2000 to 2020 (August). The greenness index (NDVI), wetness index (WET), heat index (LST) and dryness index (NDSI) were calculated by removing cloud pixels and masking the water body information. Based on this, Principal Component Analysis (PCA) was used to construct remote sensing ecological index (RSEI), and the eco-environmental quality of the mining area from 2000 to 2020 was evaluated.?The results show that: (1) from 2000 to 2020, the RSEI of disturbance area and recovery area of the mining area decreased slightly in the early stage and increased as a whole in the later stage.?(2) The eco-environmental quality of the mining area experienced a deterioration-recovery-stable development trend in the past 21 years, in which the deteriorating area accounted for a relatively large proportion from 2000 to 2010, and from 2010 to 2020, the proportion of deteriorated area decreased, while the proportion of improved area increased.?(3) In the center of gravity migration of eco-environmental quality in mining area, the migration trajectory of gravity center of I and II was basically the same, and the migration range was large, and the migration of gravity center of III, IV and V was closely related to the position of dump in mining area.?(4) The eco-environmental quality assessment on the mining area scale carried out by using the GEE platform is not only convenient to obtain data and save calculation time, but also can timely and accurately grasp the ecological environment quality of the mining area, and the evaluation results are more reliable, which is consistent with the actual monitoring results of the mining area.