Full
Outline
To investigate the influence of changes in water salinity (composition and concentration) on key nitrate reduction processes in lake wetlands of arid regions, field surveys and salinity-controlled experiments were conducted in Bosten Lake and Xiangsi Lake wetlands located in the arid zone of northwestern China. Field surveys revealed that denitrification rates in Bosten Lake and the surrounding Xiangsi Lake wetland ranged from 7.2 to 131.4 μmol/(kg·h), and salinity was identified as a key environmental factor affecting denitrification. The rates of dissimilatory nitrate reduction to ammonium (DNRA) varied from 2.6 to 19.9μmol/(kg·h), which were primarily influenced by the ratio of dissolved organic carbon to nitrate in the water. In the salinity-controlled experiments, increased salinity (0.2‰~6.6‰) significantly inhibited denitrification rates: with increasing sodium sulfate concentration, denitrification rates declined by 25.7% (Bosten Lake) and 21.0% (Xiangsi Lake), respectively; while increasing sodium chloride concentration led to respective decreases of 36.7% and 31.1% in the two wetlands. Changes in salinity also significantly impacted DNRA rates: DNRA rates first increased and then decreased with rising sodium sulfate concentration in both wetlands, whereas they decreased by 26.1% (Bosten Lake) and 27.8% (Xiangsi Lake) with increasing sodium chloride concentration. Increased salinity exerted a stronger inhibitory effect on denitrificationcompared to DNRA, resulting in an elevated proportion of DNRA in total dissimilatory nitrate reduction. Overall, increased salinity will elevate lake nitrogen concentrations by inhibiting denitrification, while enhancing nitrogen retention potential by increasing the proportion of DNRA, thereby exacerbating the risk of nitrogen pollution in these lakes.
91
15
| 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
010-62662699(Operation and Technical Support)
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
