期刊
ORGANIC GEOCHEMISTRY
卷 69, 期 -, 页码 106-113出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.orggeochem.2014.02.012
关键词
-
资金
- National Basic Research Program of China [2014CB954001]
- National Science Foundation of China [40973006, 41006042, 41176164]
A litterbag method was used for studying the variability in chemical and carbon isotopic compositions of four grasses during litter decomposition. After the 300 d degradation, > 90% of litter mass was lost for three C-4 species (Setaria viridis, Eleusine indica, Amaranthus retroflexus) and one C-3 species (Erigeron speciosus). The solid state C-13 NMR spectra showed that mean proportion of aromatic and alkyl carbon increased from ca. 10% to 15% and ca. 10% to 20%, respectively, whereas that of O-alkyl carbon substantially decreased from ca. 70% to 50%. The carbon preference index and average chain length of n-alkanes remained relatively constant, whereas the carbon isotopic compositions of long chain n-alkanes varied < 2 parts per thousand. Our results demonstrate that the degradation of litters alone does not significantly change the n-alkane chemical and carbon isotopic proxies. Compared to open plant-soil systems, our litterbag experiments present much less variability in chemical and carbon isotopic compositions of n-alkanes. Based on these facts, we recommend a combined measurement of chemical and carbon isotopic properties in evaluation of carbon sources, dynamics and paleoenvironments. (C) 2014 Elsevier Ltd. All rights reserved.
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