Estimating Ecological Responses to Climatic Variability on Reclaimed and Unmined Lands Using Enhanced Vegetation Index
Estimating Ecological Responses to Climatic Variability on Reclaimed and Unmined Lands Using Enhanced Vegetation Index
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DOI：
10.3390/rs13061100
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发表时间：
2021
期刊：
影响因子：
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通讯作者：
Xiang Fan;Yongze Song;Chuxin Zhu;H. Balzter;Z. Bai
中科院分区：
文献类型：
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作者：
Xiang Fan;Yongze Song;Chuxin Zhu;H. Balzter;Z. Bai
气候对复垦矿区重新建立的生态系统的影响可能已经改变。然而，关于开垦土地和未开采土地之间植被-气候关系的差异，目前知之甚少。在这项研究中，生态响应的气候变化的复垦和邻近的未开采土地估计使用遥感数据在平朔兆煤矿，最大的煤矿之一，在中国的长期复垦历史。收集了1997年至2017年的时间序列MODIS增强植被指数（EVI）数据和气象数据。结果表明，显着不同的植被与气候之间的关系，开垦和未开采的土地。第一，所有气候变量的积累期都要长得多的复垦矿区土地。第二，植被开垦土地上的温度，降雨量，空气湿度和风速的变化，而未受干扰的植被只响应于温度和空气湿度的变化。气候变化对复垦地生态脆弱性的贡献率（20.0-46.5%）远高于未开垦地（0.7-1.7%）。这些差异主要是由有限的生态系统恢复力，并改变了网站的水文和微气候复垦土地。因此，这项研究表明，地表采矿的遗留影响可以严重改变现场植被-气候关系，从而影响复垦生态系统的结构，功能和稳定性。复垦生态系统的植被-气候关系值得进一步研究，遥感植被数据是相关研究的有效来源。
Climatic impact on re-established ecosystems at reclaimed mined lands may have changed. However, little knowledge is available about the difference in vegetation–climate relationships between reclaimed and unmined lands. In this study, ecological responses to climatic variability on reclaimed and neighbouring unmined lands were estimated using remote-sensing data at the Pingshuo Mega coal mine, one of the largest coal mines with long-term reclamation history in China. Time-series MODIS enhanced vegetation index (EVI) data and meteorological data from 1997 to 2017 were collected. Results show significantly different vegetation–climate relationships between reclaimed and unmined lands. First, the accumulation periods of all climatic variables were much longer on reclaimed mining lands. Second, vegetation on reclaimed lands responded to variabilities in temperature, rainfall, air humidity, and wind speed, while undisturbed vegetation only responded to variabilities of temperature and air humidity. Third, climatic variability made a much higher contribution to EVI variation on reclaimed land (20.0–46.5%) than on unmined land (0.7–1.7%). These differences were primarily caused by limited ecosystem resilience, and changed site hydrology and microclimate on reclaimed land. Thus, this study demonstrates that the legacy effects of surface mining can critically change on-site vegetation–climate relationships, which impacts the structure, functions, and stability of reclaimed ecosystems. Vegetation–climate relationships of reclaimed ecosystems deserve further research, and remote-sensing vegetation data are an effective source for relevant studies.