|Ecological Effects of Flow Regime Alteration in Inner Mongolia Reach of the Yellow River
|中文关键词:流量过程 水文情势 鱼类 生态效应 黄河内蒙古河段
|英文关键词:flow regime process water regime fish ecological effect the Inner Mongolia Reach of the Yellow River
| The Inner Mongolia reach of the upper Yellow River (Longyangxia-Liujiaxia section) is the river section with intensive hydropower development and the operation of hydropower station has led to significant changes of flow regime in the river section. In this study, we analyzed temporal and spatial alterations of the flow regime in Inner Mongolia, investigated the response relationship between the fish community and runoff, and discussed the ecological effects of hydrological alterations. The study was based on the long term hydrological data collected at Shizuishan, Sanhuhekou and Toudaoguai. Indicators of hydrologic alteration (IHA) and the ranges of variability (RVA) were used for the analysis. Fishery resource data was obtained by field investigation combined with market data and fisherman surveys. Results show that the flow regime of the Yellow River in Inner Mongolia changed significantly after the operation of hydropower stations in the upper reaches of the Yellow River, consequently altering river ecohydrology and continuity. During the dry season, the increases in average monthly discharge (> 70% in January and February) and minimum average daily discharge (> 50% at Shizuishan) was helpful for maintaining river flow and fish overwintering. The decreased range in daily discharge benefitted hatching of fish species with adhesive eggs. However, during flood season, average monthly discharge decreased by 50% (from July to October), as did the duration of flooding, and the occurrence of the maximum daily discharge was delayed by two months in the upper river and advanced by nearly a month in the middle and lower river, adversely affecting fish growth and reproduction. Our study provides support for ecological regulation and habitat protection in the Yellow River in Inner Mongolia.
|米玮洁,张 舜,胡 俊,高少波,胡菊香.2024.黄河内蒙古河段水文情势变化及生态效应初探[J].水生态学杂志,45(1):42-49.
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