Abstract
Purpose
In this study, 1-year decomposition experiments were conducted to measure the litter carbon decomposition dynamics in saltmarsh and to determine the changes in the chemical structure of litter carbon during the litter decomposition process.
Methods
Litterbags containing a mixture of Spartina alterniflora litter and burned sediment were buried at four S. alterniflora saltmarshes and one S. alterniflora–Suaeda salsa co-existing saltmarsh. The contents of total organic carbon (TOC) and recalcitrant carbon (RC) were determined by a Sercon Integra CN isotope ratio mass spectrometer, while the content of labile carbon (LC) was estimated by calculation. 13C nuclear magnetic resonance (NMR) spectroscopy was conducted to characterise the chemical structures of the organic carbon compounds in the S. alterniflora litter during decomposition. Solid-state 13C–CPMAS-NMR spectra were obtained using an AVANCE III 400 MHz (Bruker) spectrometer.
Results
The results indicated that more RC than LC remained in the litterbag during decomposition. The organic carbon content of the S. alterniflora litter was largely composed of alcoxyl-C compounds (78.9%), the decomposition products of which dominated the litter organic carbon fractions, including the TOC, RC, and LC. In contrast, alkyl-C, aromatic-C, and carboxyl-C products contributed mostly to RC. Differences in the negative correlations between the litter carbon fractions and alkyl-C, aromatic-C, and carboxyl-C were found among the developing saltmarshes. Humus generated by the S. alterniflora litter was mainly composed of macromolecular organic compounds containing functional groups such as methyl, methylene, methine, methoxyl, aromatic rings, phenolic hydroxyl, and carboxyl.
Conclusions
During decomposition, the organic carbon in the S. alterniflora litter was found to be dominated by O-alkyl-C, followed by aromatic-C, alkyl-C, and carboxyl-C. O-alkyl-C plays a major role in the LC proportion of organic carbon, while aromatic-C, alkyl-C, and carboxyl-C contribute more to the RC proportion. Alkyl-C was found to be more easily decomposed than aromatic-C in the S. alterniflora litter. During litter decomposition, the molecular structure complexity, humification degree, and decomposition degree of organic carbon exhibited seasonal variations. In the 3-year saltmarsh, more decomposition of the organic carbon in the S. alterniflora litter was observed as compared to other sites.
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Data availability
The data sets generated during and/or analysed during the current study are available from the corresponding author upon reasonable request.
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Acknowledgements
We thank Xiao Sheng-juan for elaborating Fig. 1 with ArcGIS 9.2 (School of Geography Science, Nanjing Normal University, Nanjing 210023, China). We thank Wu Ya-Ping, Yu Pei-pei, and Xu Jie for their assistance in sample measurements and field trip; also, thanks to Xu Lei, Ma Jie, and Ye Fei for their help in field sampling. We also thank Han Rui-ming for manuscript improvement (Environment School, Nanjing Normal University, Nanjing 210023, China).
Funding
This work was supported by the National Natural Science Foundation of China (41773077, 41877336, 41273082), the state key basic research development plan (973 Plan) (2014CB953801) of the Ministry of Science and Technology of China.
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J. L. conceived and designed the experiments, project, and supervised the study. Z. S. and J. L. performed the experiments. Y. Z. contributed to the manuscript writing and figure editing. C. Z., Y. X, and D. D. contributed to the fieldwork, sampling treatments, and data analysis. L. Z. contributed to manuscript writing.
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Highlights
• Organic compounds in Spartina alterniflora litter are dominated by the labile carbon (LC) proportion of O-alkyl-C
• O-alkyl-C plays a major role in the proportion of LC, while aromatic-C, alkyl-C, and carboxyl-C contribute more to the proportion of recalcitrant carbon (RC)
• Alkyl-C is more easily decomposed than aromatic-C in S. alterniflora litter
• The S. alterniflora litter decomposition process exhibits seasonal variation
• The decomposition of more organic carbon in the S. alterniflora litter was observed in the 3-year developing saltmarsh as compared to other sites
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Liu, Je., Shu, Z., Zhao, Yp. et al. Changes in the chemical composition of the organic carbon in Spartina alterniflora litter during decomposition in saltmarsh sediments. J Soils Sediments 21, 3438–3450 (2021). https://doi.org/10.1007/s11368-021-02975-2
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DOI: https://doi.org/10.1007/s11368-021-02975-2