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Outline
To elucidate the sources and driving mechanisms of nitrate pollution in the inflow rivers of northern Fuxian Lake, this study collected water and soil samples from 11sites across four major river catchments (Dufangdagou, Fucheng River, Yaonigou, and Longxigou) in the northern area during both the wet and dry seasons of 2022. An integrated approach combining nitrogen and oxygen isotope tracing, water chemistry analysis, land use assessment, and the MixSIAR model was employed to quantitatively determine the contributions of various nitrogen pollution sources and to identify the key factors influencing nitrate pollution. The results indicated that nitratenitrogen was the predominant nitrogen species, accounting for over 60% of total nitrogen (TN), with an increased proportion during the wet season. Soil nitrogen loss and sewage/manure discharge were identified as the primary sources of nitrate pollution, contributing 31.1%~56.1% and 15.6%~38.9%, respectively, followed by chemical fertilizer application (10.2%~45%) and atmospheric nitrogen deposition (3.3%~16.7%). Notably, the contribution from domestic sewage increased substantially in Fucheng River and Yaonigou catchments during the wet season, likely due to intensified runoff scouring and sewage overflow. In addition, soils under vegetable cultivation exhibited greater nitrate loss compared to those planted with blueberries, wheat, or tobacco, with irrigation during the dry season further exacerbating nitrogen loss. These findings highlight the urgent need for targeted management strategies to mitigate nitrate loss from legacy nitrogen pools in agricultural soils, particularly in vegetable fields.
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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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