Anthropogenic landcover impacts fluvial dissolved organic matter composition in the Upper Mississippi River Basin

被引:36
作者
Vaughn, Derrick R. [1 ]
Kellerman, Anne M. [1 ]
Wickland, Kimberly P. [2 ]
Striegl, Robert G. [2 ]
Podgorski, David C. [3 ]
Hawkings, Jon R. [1 ,4 ]
Nienhuis, Jaap H. [5 ]
Dornblaser, Mark M. [2 ]
Stets, Edward G. [6 ]
Spencer, Robert G. M. [1 ]
机构
[1] Florida State Univ, Dept Earth Ocean & Atmospher Sci, Natl High Magnet Field Lab, Geochem Grp, Tallahassee, FL 32306 USA
[2] US Geol Survey, Water Resources Mission Area, Boulder, CO USA
[3] Univ New Orleans, Pontchartrain Inst Environm Sci, Dept Chem, Chem Anal & Mass Spectrometry Facil, New Orleans, LA 70148 USA
[4] Univ Penn, Dept Earth & Environm Sci, Philadelphia, PA 19104 USA
[5] Univ Utrecht, Dept Phys Geog, Utrecht, Netherlands
[6] US Geol Survey, Mounds View, MN USA
基金
美国国家科学基金会;
关键词
Dissolved organic matter; Dissolved organic carbon; FT-ICR MS; Landcover; Agriculture; Urbanization; RESONANCE MASS-SPECTROMETRY; LAND-USE CHANGE; SOIL CARBON; MOLECULAR CHARACTERIZATION; FULVIC-ACIDS; LEAF-LITTER; MANURE APPLICATION; BOREAL FOREST; CHLOROPHYLL-A; WATER-QUALITY;
D O I
10.1007/s10533-021-00852-1
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Landcover changes have altered the natural carbon cycle; however, most landcover studies focus on either forest conversion to agriculture or urban, rarely both. We present differences in dissolved organic carbon (DOC) concentrations and dissolved organic matter (DOM) molecular composition within Upper Mississippi River Basin low order streams and rivers draining one of three dominant landcovers (forest, agriculture, and urban). Streams draining forest and urban landcovers have greater DOC concentrations, likely driven by differences in carbon sourcing, microbial processing, and soil disturbance. Using Fourier transform-ion cyclotron resonance mass spectrometry, 24% of assigned molecular formulae are common across all landcovers. Relative abundances of N-,S- heteroatomic formulae (CHON, CHOS, CHONS) are higher for agricultural and urban streams, with agricultural stream DOM having more N-containing formulae compared to urban stream DOM, which has more S-containing formulae. Higher N-,S- heteroatomic formulae abundance, along with enrichment in aliphatic, N-aliphatic, and highly unsaturated and phenolic (low O/C) compound categories within agricultural and urban stream DOM are likely to result from increased anthropogenic inputs, autochthonous production, and microbial processing associated with agricultural and urban impacts. Reduced N-,S- heteroatomic formulae abundances in forested stream DOM, along with enrichments in condensed aromatics, polyphenolics, and highly unsaturated phenolic (high O/C) compound categories, likely reflect greater contributions from surrounding organic-rich forest soil and vegetation. Overall, landcover change from forested to agriculture lowers DOC concentrations and changes from forested to agriculture or urban increases autochthonous, and presumably more biolabile, DOM contributions with ramifications for stream biogeochemical cycling.
引用
收藏
页码:117 / 141
页数:25
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