Characterization of soil organic carbon in drained thaw-lake basins of Arctic Alaska using NMR and FTIR photoacoustic spectroscopy

被引:70
|
作者
Pedersen, Joel A. [1 ,2 ]
Simpson, Myrna A. [3 ]
Bockheim, James G. [1 ]
Kumar, Kartik [2 ]
机构
[1] Univ Wisconsin, Dept Soil Sci, Madison, WI 53706 USA
[2] Univ Wisconsin, Mol & Environm Toxicol Ctr, Madison, WI 53706 USA
[3] Univ Toronto, Dept Chem, Toronto, ON M1C 1A4, Canada
基金
美国国家科学基金会; 加拿大自然科学与工程研究理事会;
关键词
NUCLEAR-MAGNETIC-RESONANCE; TUNDRA SOILS; MATTER COMPOSITION; CLIMATE-CHANGE; C-13; FRACTIONS; TRANSFORMATION; OXIDATION; STORAGE; AGE;
D O I
10.1016/j.orggeochem.2011.04.003
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
Arctic soils contain a large fraction of Earth's stored carbon. Temperature increases in the Arctic may enhance decomposition of this stored carbon, shifting the role of Arctic soils from a net sink to a new source of atmospheric CO2. Predicting the impact of Arctic warming on soil carbon reserves requires knowledge of the composition of the stored organic matter. Here, we employ solid state C-13 nuclear magnetic resonance (NMR) spectroscopy and Fourier transform infrared-photoacoustic spectroscopy (FTIR-PAS) to investigate the chemical composition of soil organic matter collected from drained thaw-lake basins ranging in age from 0 to 5500 years before present (y BP). The C-13 NMR and FTIR-PAS data were largely congruent. Surface horizons contain relatively large amounts of O-alkyl carbon, suggesting that the soil organic matter is rich in labile constituents. Soil organic matter decreases with depth with the relative amounts of O-alkyl carbon decreasing and aromatic carbon increasing. These data indicate that lower horizons are in a more advanced stage of decomposition than upper horizons. Nonetheless, a substantial fraction of carbon in lower horizons, even for ancient thaw-lake basins (2000-5500 y BP), is present as O-alkyl carbon reflecting the preservation of intrinsically labile organic matter constituents. Climate change-induced increases in the depth of the soil active layer are expected to accelerate the depletion of this carbon. (C) 2011 Elsevier Ltd. All rights reserved.
引用
收藏
页码:947 / 954
页数:8
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