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Morphological characteristics of amino acids in wet deposition of Danjiangkou Reservoir in China’s South–to–North Water Diversion Project

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Abstract

Amino acids are an important constituent in organic nitrogen deposition, and changes in the content of their components have a direct impact on the nitrogen input to the ecosystem. From December 2018 to November 2019, 176 precipitation samples were collected at Danjiangkou Reservoir, the source of the middle line of the South–to–North Water Diversion Project, and the variation characteristics of dissolved free amino acids (DFAA) and dissolved combined amino acids (DCAA) were analyzed. The volume-weighted value concentration ranges of DFAA and DCAA were 0.159–1.136 μmol/L and 1.603–7.044 μmol/L, respectively, and amino acids were dominated by DCAA in wet deposition. Our results showed that glutamic acid (Glu), glycine (Gly), and aspartic acid (Asp) were the dominant amino acids in both DFAA and DCAA. The concentration of DFAA was highest in winter, while the concentration of DCAA was in autumn. Dissolved total amino acids (DTAA) were insignificantly correlated with DFAA, whereas they were linearly correlated with DCAA, indicating a significant influence of agricultural activities on DTAA. The analysis of the backward trajectory of air masses showed that amino acids were mainly influenced by proximity inputs around the reservoir. The bioavailability of organic matter was higher in the southeastern of the reservoir than in the northwestern. The wet deposition flux of TDN was 14.096 kg N/ha/year, and the potential ecological impact on water bodies cannot be ignored. This study was conducted to clarify the variation characteristics of amino acids fractions in wet deposition and to provide parameters for regional assessment of amino acids wet deposition. The ecological impact of nitrogen wet deposition on water bodies will be explored to provide a basis for nitrogen pollution control and water quality protection in the middle line of the South–to–North Water Diversion Project.

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The datasets used and/or analyzed during the current study are available from the corresponding author on reasonable request.

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Acknowledgements

We thank the Ningbo customs technical center, China, for the determination of the samples in this study.

Funding

This study was supported by the major project for Henan Province Joint Funds of the National Natural Science Foundation of China (No.U1704241), Plan for Scientific Innovation Talent of Henan Province (No. 194200510010), and the National Natural Science Foundation of China (No. 41702174).

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LW contributed to the conceptualization, formal analysis, methodology, and the manuscript. ZHW contributed to the data curation, formal analysis, investigation, and the manuscript. TJC contributed to methodology. BHS contributed to the formal analysis and visualization. TQZ contributed to the manuscript. HPW contributed to the data curation and formal analysis. MM contributed to the methodology.

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Correspondence to Tongqian Zhao.

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The authors declare no competing interests.

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Wu, L., Wang, Z., Chang, T. et al. Morphological characteristics of amino acids in wet deposition of Danjiangkou Reservoir in China’s South–to–North Water Diversion Project. Environ Sci Pollut Res 29, 73100–73114 (2022). https://doi.org/10.1007/s11356-022-20802-0

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  • DOI: https://doi.org/10.1007/s11356-022-20802-0

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