PDF
Full
Outline
The lakes on Tibetan Plateau are expanding continuously, and the frequency and intensity of natural disasters (debris flow, glacial lake outburst) are increasing, which brings a series of challenges to water resources management, water disaster prevention and sustainable development in Tibetan Plateau and its downstream areas. Taking Yigong Lake as the research object, this paper establishes Tableland NDWI (TNDWI) based on 1 101 remote sensing images. Then the water surface morphology of Yigong Lake from 1986 to 2020 is reconstructed to analyze evalution process of historical water surface morphology in lake. The results show that the user accuracy of the TNDWI for the classification of plateau water bodies is higher than 96.70%, the overall accuracy is higher than 98.75%, and the Kappa coefficient is between 0.972 and 0.992, and the classification accuracy and consistency are better than the tranditional NDWI; The 2000 Yigong landslide has a significant impact on the evolution process of water surface morphology of Yigong Lake; Water surface area after dam-break reduces from 14.44±2.70 km2 to 10.99±1.94 km2(P <0.001). Mann-Kendall mutation test results show that the change trend of water surface morphology has a mutation in 2000 (except in dry season); Morlet wavelet periodic analysis results show that the periodic oscillation law of lake area has gradually weakened since 2000. This study overcomes the lack of monitoring data of high altitude barrier lake, providing data basis for the ecological restoration and comprehensive treatment project of Yigong Lake as well as new idea for the quantitative study of the ecological environment in the region.
PDF
122
36
| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
关闭全屏
No. 86 Xueyuan South Road, Haidian District, Beijing
010-62199257
qkjq@cast.org.cn
Copyright © 2025 China Association for Science and Technology. All rights reserved. For all open access content, the relevant licensing terms apply.
Sponsored by the Office of the Leading Group for Cybersecurity and Informatization of CAST, and supported by Science and Technology Review Publishing House
