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Outline
Based on hydrodynamic, water quality, and aquatic ecology models, the ecological flow requirements needed to meet water quality standards, suppress algal blooms, and support fish spawning in the middle and lower Hanjiang River were quantified, and temporally and spatially coupled ecological flow regimes by period, type, and region were proposed. The spatiotemporal coupling indicated that ecological flows at the Huangjiagang, Xiangyang, Huangzhuang, Shayang, and Xiantao sections ranged from 330~904m3/s, 366~1135m3/s, 514~1160m3/s, 632~1236m3/s, and 486~1013m3/s, respectively. From February to April of the subsequent year, ecological flow was governed by algal bloom control requirements; from June to September, it was driven by water quality compliance; and from October to November, it was dictated by fish spawning needs. During the dry season, ecological flow in the midstream region was determined by algal bloom prevention and control, whereas in the downstream section it was determined by fish spawning requirements. During the flood season, ecological flow across the entire middle and lower Hanjiang River was governed by the attainment of water quality standards. This work provided a new perspective for the systematic study of ecological flow in rivers and offered scientific evidence and a theoretical foundation for river ecosystem improvement and related engineering applications.
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| 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 |
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