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水土流失也叫土壤侵蚀,是目前威胁人类生态安全的重要表现形式之一。该研究采用Landsat 5和Landsat 8遥感数据影像为主要数据源,通过对影像进行裸土提取和裸土动态变化分析,并结合基础地理数据和野外实地考察资料,对永泰县1989—2015年间的水土流失进行监测和评估,并对永泰县的生态安全状况进行合理有效的评价。遥感影像经过数据分析处理后的裸土识别制图为水土流失治理工作提供了科学高效的技术支撑,为了对永泰县水土流失进行动态监测,并对其治理成效进行评价,该文基于Landsat卫星影像和遥感信息技术,将裸土指数(NDSI)与不透水面指数(NDISI)相结合,提取永泰县1989—2015年的地表裸土信息,从而对该县近26年来的地表裸土进行时空变化分析。结果表明,永泰县地表裸土面积在26年间大幅减少,特别在1995—2006年裸土减少速率最大,这说明2000年后,永泰县水土流失治理工作明显加快。
Soil and water loss, also known as soil erosion, is one of the important manifestations that threaten human ecological security. In this study, Landsat 5 and Landsat 8 remote sensing data were used as the main data source. By analyzing the images of bare soil and dynamic changes of bare soil, combined with the basic geographical data and field investigation data, Loss monitoring and assessment, and the ecological safety of Yongtai County, a reasonable and effective evaluation. In order to monitor the soil and water loss in Yongtai County dynamically and evaluate the effectiveness of its management, this paper based on Landsat satellite imagery and Remote sensing information technology, the bare soil index (NDSI) and the impervious surface index (NDISI) combined to extract Yongtai 1989-2015 surface bare soil information, so that the county nearly 26 years of surface bare soil changes in space-time analysis . The results showed that the bare land area of Yongtai County decreased significantly in 26 years, especially in 1995-2006, which shows that the control of soil and water loss in Yongtai County accelerated obviously after 2000.