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Soil Organic Carbon Pool and Its Chemical Composition in Phyllostachy pubescens Forests at Two Altitudes in Jian-ou City, China.

Ji H, Zhuang S, Zhu Z, Zhong Z - PLoS ONE (2015)

Bottom Line: However, the proportions of the three combined humus C showed no significant differences between the two altitudes.The results of 13C-NMR showed that the SOC chemical composition did not significantly vary with elevation as well.Overall, the results suggested that altitude should be considered during regional SOC estimation and that altitude affected the quantity rather than the quality of the SOC under the same P. pubescens vegetation.

View Article: PubMed Central - PubMed

Affiliation: State Key Lab of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing, Jiangsu Province, China.

ABSTRACT
Phyllostachys pubescens forests play an important role in soil organic carbon (SOC) sequestration in terrestrial ecosystems. However, the estimation and mechanism of SOC sequestration by P. pubescens forests remain unclear. In this study, the effect of P. pubescens forest distribution with elevation was investigated at two altitude sites in Jian-ou City, Southeast China. SOC storage was estimated and its chemical composition was obtained via 13C-nuclear magnetic resonance (NMR), chemical classification, and spectral analysis. Results showed that the SOC contents and stocks were significantly higher at the high-altitude site than at the low-altitude site in the entire soil profile (0-60 cm). The C contents of the three combined humus forms exhibited similar responses to the elevation change, and all of these forms were higher at the high-altitude site than at the low-altitude site regardless of soil layer. However, the proportions of the three combined humus C showed no significant differences between the two altitudes. The results of 13C-NMR showed that the SOC chemical composition did not significantly vary with elevation as well. This finding was consistent with the E465/E665 of the loosely combined humus. Overall, the results suggested that altitude should be considered during regional SOC estimation and that altitude affected the quantity rather than the quality of the SOC under the same P. pubescens vegetation.

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Solid-state 13C-NMR spectra of soil samples from the LAS.LAS: low-altitude site; HAS: high-altitude site.
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pone.0146029.g004: Solid-state 13C-NMR spectra of soil samples from the LAS.LAS: low-altitude site; HAS: high-altitude site.

Mentions: The solid-state 13C CPMAS NMR spectra of soils in the 0–10 cm layer from the LAS and HAS are shown in Figs 4 and 5. The spectra shared similar patterns but differed in the relative intensity of the different chemical shift regions. The soil alkyl C, aromatic C content, alkyl to O-alkyl C ratio (A/O-A), and aromaticity were higher at the HAS than at the LAS, but no significant difference was found between the two sites (P > 0.05) (Table 3). However, the soil O-alkyl C content was significantly greater at the LAS than at the HAS (P < 0.05).


Soil Organic Carbon Pool and Its Chemical Composition in Phyllostachy pubescens Forests at Two Altitudes in Jian-ou City, China.

Ji H, Zhuang S, Zhu Z, Zhong Z - PLoS ONE (2015)

Solid-state 13C-NMR spectra of soil samples from the LAS.LAS: low-altitude site; HAS: high-altitude site.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4696818&req=5

pone.0146029.g004: Solid-state 13C-NMR spectra of soil samples from the LAS.LAS: low-altitude site; HAS: high-altitude site.
Mentions: The solid-state 13C CPMAS NMR spectra of soils in the 0–10 cm layer from the LAS and HAS are shown in Figs 4 and 5. The spectra shared similar patterns but differed in the relative intensity of the different chemical shift regions. The soil alkyl C, aromatic C content, alkyl to O-alkyl C ratio (A/O-A), and aromaticity were higher at the HAS than at the LAS, but no significant difference was found between the two sites (P > 0.05) (Table 3). However, the soil O-alkyl C content was significantly greater at the LAS than at the HAS (P < 0.05).

Bottom Line: However, the proportions of the three combined humus C showed no significant differences between the two altitudes.The results of 13C-NMR showed that the SOC chemical composition did not significantly vary with elevation as well.Overall, the results suggested that altitude should be considered during regional SOC estimation and that altitude affected the quantity rather than the quality of the SOC under the same P. pubescens vegetation.

View Article: PubMed Central - PubMed

Affiliation: State Key Lab of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing, Jiangsu Province, China.

ABSTRACT
Phyllostachys pubescens forests play an important role in soil organic carbon (SOC) sequestration in terrestrial ecosystems. However, the estimation and mechanism of SOC sequestration by P. pubescens forests remain unclear. In this study, the effect of P. pubescens forest distribution with elevation was investigated at two altitude sites in Jian-ou City, Southeast China. SOC storage was estimated and its chemical composition was obtained via 13C-nuclear magnetic resonance (NMR), chemical classification, and spectral analysis. Results showed that the SOC contents and stocks were significantly higher at the high-altitude site than at the low-altitude site in the entire soil profile (0-60 cm). The C contents of the three combined humus forms exhibited similar responses to the elevation change, and all of these forms were higher at the high-altitude site than at the low-altitude site regardless of soil layer. However, the proportions of the three combined humus C showed no significant differences between the two altitudes. The results of 13C-NMR showed that the SOC chemical composition did not significantly vary with elevation as well. This finding was consistent with the E465/E665 of the loosely combined humus. Overall, the results suggested that altitude should be considered during regional SOC estimation and that altitude affected the quantity rather than the quality of the SOC under the same P. pubescens vegetation.

Show MeSH
Related in: MedlinePlus