干旱区水电站建设运营生态环境影响遥感监测

doi:10.13866/j.azr.2023.09.13

Abstract

Abstract:

Hydropower is an important clean energy source in China. However, the construction and operation cycles of hydropower stations are long, and their long-term impact on the ecosystem is unclear. In arid areas, with their unique geographical location and dry climate, ecosystems often have limited self-regulation abilities, making restoring the local ecological environment after damage challenging. This study focuses on Longyangxia Hydropower Station, a representative hydropower station in an arid region of China, and uses Landsat series satellite data and land remote sensing products to monitor the ecological environment surrounding the hydropower station from 2000 to 2021. The study employs buffer zone and trend analyses to assess the impact on the ecological environment arounding the Hydropower. The results indicate the following: (1) The land use pattern around Longyangxia Hydropower Station did not change significantly from 2000 to 2021. However, the proportion of grasslands increased slightly, while that of other land use types decreased slightly. (2) During the same period, the wetland area around Longyangxia Hydropower Station increased significantly. (3) The vegetation in the surrounding area of Longyangxia Hydropower Station showed good growth over the past two decades, with an increase in the proportion of areas with high vegetation coverage. (4) The carbon sequestration capacity of vegetation in the vicinity of the hydropower station improved, and vegetation productivity gradually recovered as the growth rate of the wetland area decreased.

Key words: hydropower stations, ecological environment impact, vegetation coverage, land use types, remote sensing, monitoring

MA Yaoyao, SHI Peijun, XU Wei, ZHANG Gangfeng. Remote sensing monitoring of the ecological environment of hydropower station construction and operation in arid areas： A case study of Longyangxia Hydropower Station[J].Arid Zone Research, 2023, 40(9): 1498-1508.

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References 33

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年份	不同等级植被覆盖度占比/%
年份	0%~10%	10%~20%	20%~40%	40%~60%	60%~80%	80%~100%
2000	2.18	18.11	49.85	20.45	6.11	3.37
2005	1.76	14.99	53.19	18.37	6.2	5.6
2010	1.28	3.91	45.02	29.45	12.1	8.35
2015	0.92	0.2	31.35	43.35	17.14	7.11
2020	0.14	0.03	0.56	37.43	40.41	21.46

土地利用类型	面积占比/%
土地利用类型	2000年	2005年	2010年	2015年	2020年
耕地	3.34	3.48	3.66	3.56	1.97
林地	0.22	0.11	0.09	0.09	0.17
草地	42.73	41.46	46.3	45.07	45.55
水域	33.69	35.17	28.99	31.48	32.36
未利用土地	20.02	19.78	20.96	19.8	19.95

2000年	2020年
2000年	草地	耕地	林地	水域	未利用土地	2000年转出
草地	303.15	8.2	0.86	35.34	47.47	91.87
耕地	6.12	8.46	0	9.93	6.49	22.54
林地	1	0	0.98	0.02	0	1.02
水域	11.61	0.04	0	294.03	7.16	18.81
未利用土地	39.1	1.83	0.15	27.65	107.98	68.73
2020转入	57.83	10.06	1.02	72.94	61.13

Remote sensing monitoring of the ecological environment of hydropower station construction and operation in arid areas： A case study of Longyangxia Hydropower Station

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