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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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Related in: MedlinePlus

Comparison of the C contents of combined humus forms in the different soil layers between two elevations.C contents of (A) loosely combined humus, (B) stably combined humus, and (C) tightly combined humus. LAS: low-altitude site; HAS: high-altitude site.
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pone.0146029.g002: Comparison of the C contents of combined humus forms in the different soil layers between two elevations.C contents of (A) loosely combined humus, (B) stably combined humus, and (C) tightly combined humus. LAS: low-altitude site; HAS: high-altitude site.

Mentions: The three types of combined humus C (loosely, stably, and tightly combined humus C) are shown in Fig 2 and Table 2. The C contents of the loosely, stably, and tightly combined humus ranged from 4.5 g kg−1 to 13.3 g kg−1 (Fig 2A), 0.6 g kg−1 to 1.2 g kg−1 (Fig 2B), and 4.6 g kg−1 to 19.8 g kg−1 (Fig 2C), respectively. In the 0–10 cm, 10–20 cm, 20–40 cm, and 40–60 cm soil layers, the C content of the loosely combined humus was 80.3%, 64.2%, 74.9%, and 31.2% higher at the HAS than at the LAS, respectively (Fig 2A). Similarly, the C content of the stably combined humus was 57.7%, 66.3%, 41.5%, and 53.9% higher (Fig 2B), and the C content of the tightly combined humus was 82.3%, 59.0%, 69.9%, and 20.9% higher (Fig 2C) at the HAS than at the LAS in the respective soil layers. The combined humus forms were arranged on the basis of C content in the following order: tightly > loosely > stably combined humus C (Fig 2). All of the combined-humus C contents decreased with increasing soil depth at both sites (Fig 2). However, the proportions of the three combined humus C showed no significant differences between the two altitudes regardless of soil layer (P > 0.05) (Table 2).


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)

Comparison of the C contents of combined humus forms in the different soil layers between two elevations.C contents of (A) loosely combined humus, (B) stably combined humus, and (C) tightly combined humus. 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.g002: Comparison of the C contents of combined humus forms in the different soil layers between two elevations.C contents of (A) loosely combined humus, (B) stably combined humus, and (C) tightly combined humus. LAS: low-altitude site; HAS: high-altitude site.
Mentions: The three types of combined humus C (loosely, stably, and tightly combined humus C) are shown in Fig 2 and Table 2. The C contents of the loosely, stably, and tightly combined humus ranged from 4.5 g kg−1 to 13.3 g kg−1 (Fig 2A), 0.6 g kg−1 to 1.2 g kg−1 (Fig 2B), and 4.6 g kg−1 to 19.8 g kg−1 (Fig 2C), respectively. In the 0–10 cm, 10–20 cm, 20–40 cm, and 40–60 cm soil layers, the C content of the loosely combined humus was 80.3%, 64.2%, 74.9%, and 31.2% higher at the HAS than at the LAS, respectively (Fig 2A). Similarly, the C content of the stably combined humus was 57.7%, 66.3%, 41.5%, and 53.9% higher (Fig 2B), and the C content of the tightly combined humus was 82.3%, 59.0%, 69.9%, and 20.9% higher (Fig 2C) at the HAS than at the LAS in the respective soil layers. The combined humus forms were arranged on the basis of C content in the following order: tightly > loosely > stably combined humus C (Fig 2). All of the combined-humus C contents decreased with increasing soil depth at both sites (Fig 2). However, the proportions of the three combined humus C showed no significant differences between the two altitudes regardless of soil layer (P > 0.05) (Table 2).

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