Abstract
Identifying nitrogen (N) pollution sources is the fundamental work of non-point source pollution load reduction from watersheds, but is hard due to complex N transport and transformation within spatially heterogenized huge areas. During September 2011, we measured water characteristics and sediment N stable isotope in four tributaries of the upper reach of the Hun River, an important water source of the Dahuofang Reservoir, a large drinking water source in Northeast China. Results showed that spatial changes in SO4 2− and Cl− contents in the tributaries were consisted with the changes in density of the population living along the tributaries. Sediment δ15N from all tributaries showed a downstream increasing trend in line with the land use change, which is characterized as more farmlands and more people around the outlet area of each tributary. Principal component analysis indicated the population density had a strong impact on N in these tributaries in the low-flow period. Tributaries and villages close to the Dahuofang Reservoir should be the major N load control objects in reduction of non-point source nitrogen load from the upper reach of the Hun River.
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Acknowledgments
We thank the staff members of the Qingyuan Experimental Station of Forest Ecology, Chinese Academy of Sciences, with the help of water sampling. This study was funded by the Major Science and Technology Program for Water Pollution Control and Treatment of China (2012ZX07202008).
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Ma, J., Chen, X., Huang, B. et al. Utilizing water characteristics and sediment nitrogen isotopic features to identify non-point nitrogen pollution sources at watershed scale in Liaoning Province, China. Environ Sci Pollut Res 22, 2699–2707 (2015). https://doi.org/10.1007/s11356-014-3540-1
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DOI: https://doi.org/10.1007/s11356-014-3540-1