Seasonal changes predominant over manure application in driving dissolved organic matter shifts in agricultural runoff |
| |
| Affiliation: | 1. Department of Bioengineering, University of Missouri, Columbia, MO 56211, USA;2. Department of Systems Engineering and Management, Air Force Institute of Technology, WPAFB, OH 45433, USA;3. Department of Agronomy, Horticulture, and Plant Science, South Dakota State University, Brookings, SD 57007, USA;1. State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China;2. School of Geography Science, Nanjing Normal University, Nanjing 210023, China;3. College of Environment Science and Engineering, China West Normal University, Nanchong 637000, China;4. School of Environment and Planning, University of Liaocheng, Liaocheng 252059, China;5. University of Chinese Academy of Sciences, Beijing 100049, China;1. Institute of Environmental and Biogeochemistry (eBig), School of Earth Sciences, Zhejiang University, Hangzhou 310027, China;2. State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Changping District, Beijing 102249, China;3. Department of Ocean Science and Engineering, Southern University of Science and Technology, Shenzhen 518055, China;4. College of Hydraulic and Environmental Engineering, China Three Gorges University, Yichang 443002, China |
| |
| Abstract: | Non-point source nutrient pollution can cause eutrophication, hypoxic events, and harmful algal blooms in surface waters. Surface water eutrophication is frequently attributed to agricultural runoff, a known source of inorganic and organic nutrients to surface and subsurface waters. Analysis of dissolved organic matter (DOM) using ultrahigh resolution mass spectrometry is an effective tool for characterizing diverse organic nitrogen and phosphorus components of DOM that may be mineralized and/or assimilated and ultimately contribute to eutrophication. An anion exchange resin was applied to extract DOM from surface and subsurface tile runoff from agricultural plots located within the Maumee River watershed (Ohio, USA) that received raw liquid manure, polymer-treated dewatered manure, or no manure (control). DOM extracts were analyzed using Fourier transform ion cyclotron resonance mass spectrometry prior to manure application and during three runoff events after manure application. Organic nitrogen compounds were predominant, making up 38–48% of the total assigned formulas. Principle coordinates analysis indicated clustering predominately by sample month and secondarily by treatment. These findings show that a large amount of variability in DOM in runoff was observed regardless of manure application, indicating the important role played by natural processes in driving transformation of the DOM pool during the growing season. Molecular ions unique to runoff from manure-applied plots were also identified that may be useful in source-tracking of non-point source nutrient pollution in waters draining to Lake Erie. |
| |
| Keywords: | Dissolved organic matter Organic nitrogen Agricultural runoff Treated manure FTICR |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
