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Environmental Earth Sciences

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01.01.2013 | Original Article

Evaluation of nitrate source in surface water of southwestern China based on stable isotopes

verfasst von: Si-Liang Li, Cong-Qiang Liu, Jun Li, Zicheng Xue, Jin Guan, Yunchao Lang, Hu Ding, Longbo Li

Erschienen in: Environmental Earth Sciences | Ausgabe 1/2013

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Abstract

Stable isotope tracing and analysis play an important role in interpretation of hydrological and ecological processes at the watershed scale and can provide information regarding the flow path, water source, nutrient loss and biogeochemical cycles of a system. In this study, environmental isotopes (δ¹⁸O-H₂O, δD, δ¹⁵N-NO₃ ⁻, δ¹⁸O-NO₃ ⁻) and chemical compositions of surface water in Guizhou Province, China, were measured to evaluate the primary sources of nitrate and characterize the processes affecting nitrate as well as its correlation with vegetation cover in karstic areas. The δ¹⁵N and δ¹⁸O-NO₃ ⁻ levels ranged from +1.3 to +9.8 ‰ and +4.7 to +16.9 ‰, respectively, which indicated that nitrate in water from the investigated area primarily originated from nitrification of soil organic matter during the sampling period. There was also a wide range of isotopes in the water and high contents of nitrate in karstic areas with poor vegetation cover, indicating that water and nutrient loss were serious problems hindering plant growth in the study areas. For example, there was a positive relationship between isotopic composition and nitrate content in the natural forest and negative relationship in Libo County nearby, which suggested that the nitrate fate was affected by land use and human disturbance.

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Titel: Evaluation of nitrate source in surface water of southwestern China based on stable isotopes
verfasst von: Si-Liang Li
Cong-Qiang Liu
Jun Li
Zicheng Xue
Jin Guan
Yunchao Lang
Hu Ding
Longbo Li
Publikationsdatum: 01.01.2013
Verlag: Springer-Verlag
Erschienen in: Environmental Earth Sciences / Ausgabe 1/2013
Print ISSN: 1866-6280
Elektronische ISSN: 1866-6299
DOI: https://doi.org/10.1007/s12665-012-1733-9

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