Relative contribution of foliar and fine root pine litter to the molecular composition of soil organic matter after in situ degradation

Mambelli, Stefania; Bird, Jeffrey A.; Gleixner, Gerd; Dawson, Todd E.; Torn, M. S.

doi:10.1016/j.orggeochem.2011.06.008

Cited by 67 publications

(102 citation statements)

References 61 publications

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“…While the vegetation type is considered to be a primary factor for different plots having different SOC turnover times, the sources for the soil organic matter must also play an important role. Compared with above-ground litterfall, root debris input forms a greater contribution to the formation of stable soil carbon pool [65][66][67][68][69]. Therefore, the root-to-shoot ratio of plant debris incorporated into the soil is an essential controlling factor for the formation and stabilization of soil organic matter [70].…”

Section: Soc Turnover Timesmentioning

confidence: 99%

Soil aggregate fraction-based 14C analysis and its application in the study of soil organic carbon turnover under forests of different ages

2013

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There still exist uncertainties in the trend, magnitude and efficiency of carbon sequestration with regard to the changes in soil organic carbon (SOC) pools after afforestation. In this study, SOC turnover times of the meadow steppe and planted forests at Saihanba Forest Station of Hebei Province, China are estimated by means of the radiocarbon ( 14 C) method. Our results show that the SOC turnover times can be as long as from 70 to 250 years. After planting the Pinus sylvestri var. mongolica in the Leymus chinensis meadow steppe, the turnover times of organic carbon in both bulk samples and soil aggregate fractions of the topsoils are decreased with an increase of the stand age. Such a lowering of the turnover time would cause an increase in soil CO 2 flux, implying that afforestation of grassland may reduce the capacity of topsoil to sequestrate organic carbon. Combined stable isotope and 14 C analyses on soil aggregate fractions suggest that there are different responses to afforestation of grassland between young and old carbon pools in topsoils. In the young and middle-age planted forests, the proportion of CO 2 emission from the older soil carbon pool shows an increasing trend. But in the mature planted forest, its proportion tends to decline, indicating that the stand age may influence the soil carbon sequestration mechanism. The CO 2 emission from the topsoils estimated using the 14 C method is relatively low compared to those by other methods and may be caused by the partial isolation of the young carbon component from the soil aggregates. For more accurate estimation of CO 2 flux, future studies should therefore employ improved methodology for more effective separation of different soil carbon components before isotope analyses.14 C, soil organic carbon turnover, aggregate fractions, Saihanba, afforestation of grassland, stand age Citation:Tan W B, Zhou L P, Liu K X. Soil aggregate fraction-based 14 C analysis and its application in the study of soil organic carbon turnover under forests of different ages.

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Section: Soc Turnover Timesmentioning

confidence: 99%

Soil aggregate fraction-based 14C analysis and its application in the study of soil organic carbon turnover under forests of different ages

2013

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“…Since the first adaptation of the Py-CSIA hyphenated technique for δ 13 C by Goñi and Eglinton [4], and to our knowledge, the present work is the first report combining light stable isotopes, Py-GC-MS and Py-CSIA for the characterization of siliceous speleothems.…”

Section: Applied Gas Chromatography Coupled To Isotope Ratio Mass Spementioning

confidence: 90%

“…Pyrolysis compound-specific isotope analysis (Py-CSIA) combines the advantages of analytical pyrolysis (Py-GC-MS) with IRMS for the characterization of entrapped or low solubility organic compounds. In this case, the pyrolysate is directed to an isotope ratio mass spectrometer (Py-GC-C-IRMS) to measure stable isotope proportions i.e., δ 13 C, δ 15 N, of specific pyrolysis compounds [3]. Early work demonstrated that the pyrolysis process does not produce appreciable fractionation of stable isotopes and therefore the pyrolysis products are considered to be isotopically representative of the starting material [4][5][6].…”

Section: Applied Gas Chromatography Coupled To Isotope Ratio Mass Spementioning

confidence: 99%

“…Typical configurations of generic Py-CSIA devices have been previously described [7][8][9]. This technique has been recently used in a variety of fields from extraterrestrial OM in meteorites [7,8], soil and sediments [10][11][12][13], oil shales and petrol [14,15], polymers and food [3,16]. Therefore, Py-CSIA represents a promising technique with high potential for the study of the effect of environmental changes in subterranean environments, such as caves.…”

Section: Applied Gas Chromatography Coupled To Isotope Ratio Mass Spementioning

confidence: 99%

“…However and taking into account that the overlying sediments are a major source of carbon for speleothem growth, the δ 13 C of the organic fraction (δ 13 Corg) can also provide useful information on the origin of the organic matter (OM) of speleothems [41,42]. Moreover, stable isotopes (δ 13 Corg, δ 15 N) and C/N ratios can also be valuable indicators of OM origin and decay [42][43][44]. The basis for this approach is that each individual organic compound in OM inherits a specific isotopic signature resulting from its natural origin and post-depositional transformation pathway [45].…”

Section: Applied Gas Chromatography Coupled To Isotope Ratio Mass Spementioning

confidence: 99%

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Analytical pyrolysis and stable isotope analyses reveal past environmental changes in coralloid speleothems from Easter Island (Chile)

Miller

Rosa

Morillo

et al. 2016

Journal of Chromatography A

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This study comprises an innovative approach based on the combination of chromatography (analytical pyrolysis and pyrolysis compound-specific isotope analysis (Py-CSIA)), light stable isotopes, microscopy and mineralogy analyses to characterize the internal layering of coralloid speleothems from the Ana Heva lava tube in Easter Island (Chile). This multidisciplinary proxy showed that the speleothems consist of banded siliceous materials of low crystallinity with different mineralogical compositions and a significant contribution of organic carbon. Opal-A constitutes the outermost grey layer of the coralloids, whereas calcite and amorphous Mg hydrate silicate are the major components of the inner whitish and honey-brown layers, respectively. The differences found in the mineralogical, elemental, molecular and isotopic composition of these distinct coloured layers are related to environmental changes during speleothem development. Stable isotopes and analytical pyrolysis 3 suggested alterations in the water regime, pointing to wetter conditions during the formation of the Ca-rich layer and a possible increase in the amount of water dripping into the cave. The trend observed for δ 15 N values suggested an increase in the average temperature over time, which is consistent with the so-called climate warming during the Holocene.The pyrolysis compound-specific isotope analysis of each speleothem layer showed a similar trend with the bulk δ 13 C values pointing to the appropriateness of direct Py-CSIA in paleoenvironmental studies. The δ 13 C values for n-alkanes reinforced the occurrence of a drastic environmental change, indicating that the outermost Opal layer was developed under drier and more arid environmental conditions.

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Effects of pH Manipulation, Biological Reduction, and Plant Growth on Cu²⁺ and Zn²⁺ Removal from Mine Drainage Using Iron‐Oxide‐Enriched Red Earth Soils

Zhang

Luo

2014

CLEAN Soil Air Water

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Constructed wetland is an efficient method used to control heavy metal pollution from acidic wastewater, especially when local soils could be used as filling material to reduce construction cost. This study investigated the effects of pH manipulation, biological reduction, and plant growth on the removal of heavy metals (Cu 2þ and Zn 2þ ) using iron- Biological reduction caused iron-oxide mineral dissolution, but heavy metals remained within the soils. The growth of Canna (Canna indica) prompted Cu 2þ transport deep into soil layers. However, the metal transport was retarded by CaCO 3 alteration. In, conclusion, red earth soils with CaCO 3 alteration could be cost-effective filling materials to attenuate heavy metal pollution from mining drainage using constructed wetland even under biological reduction and plant growth conditions.

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Relative contribution of foliar and fine root pine litter to the molecular composition of soil organic matter after in situ degradation

Cited by 67 publications

References 61 publications

Soil aggregate fraction-based 14C analysis and its application in the study of soil organic carbon turnover under forests of different ages

Soil aggregate fraction-based 14C analysis and its application in the study of soil organic carbon turnover under forests of different ages

Analytical pyrolysis and stable isotope analyses reveal past environmental changes in coralloid speleothems from Easter Island (Chile)

Effects of pH Manipulation, Biological Reduction, and Plant Growth on Cu²⁺ and Zn²⁺ Removal from Mine Drainage Using Iron‐Oxide‐Enriched Red Earth Soils

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Relative contribution of foliar and fine root pine litter to the molecular composition of soil organic matter after in situ degradation

Cited by 67 publications

References 61 publications

Soil aggregate fraction-based 14C analysis and its application in the study of soil organic carbon turnover under forests of different ages

Soil aggregate fraction-based 14C analysis and its application in the study of soil organic carbon turnover under forests of different ages

Analytical pyrolysis and stable isotope analyses reveal past environmental changes in coralloid speleothems from Easter Island (Chile)

Effects of pH Manipulation, Biological Reduction, and Plant Growth on Cu2+ and Zn2+ Removal from Mine Drainage Using Iron‐Oxide‐Enriched Red Earth Soils

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Product

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Effects of pH Manipulation, Biological Reduction, and Plant Growth on Cu²⁺ and Zn²⁺ Removal from Mine Drainage Using Iron‐Oxide‐Enriched Red Earth Soils