Conference
Pyrolysis-compound specific isotope analysis for the direct characterization of lignin in soils. Implications for tracing climate change effects
| العنوان: | Pyrolysis-compound specific isotope analysis for the direct characterization of lignin in soils. Implications for tracing climate change effects |
|---|---|
| المؤلفون: | San Emeterio, Layla M., Pérez-Ramos, Ignacio Manuel, Domínguez, María Teresa, Rosa Arranz, José M. de la, González-Vila, Francisco Javier, González Pérez, Josefa |
| المساهمون: | European Commission, Junta de Andalucía, Ministerio de Ciencia, Innovación y Universidades (España) |
| بيانات النشر: | Sociedad Española de Cromatografía y Técnicas Afines |
| سنة النشر: | 2021 |
| المجموعة: | Digital.CSIC (Consejo Superior de Investigaciones Científicas / Spanish National Research Council) |
| الوصف: | Lignin in soils is a result of organic matter input and depletion, which is regulated by various factors, such as environmental factors like climate change (temperature, moisture, etc.) [1]. Therefore, lignin is considered an indicator of soil organic carbon storage and dynamics. Given its chemical structure, hence recalcitrance, lignin could be used as a biomarker of processes such as stabilization, mineralization, or biodegradation of soil organic matter (SOM) [2]. The study of C and H isotopes may certainly result in a comprehensive approach to estimate the fate of organic compounds, and to better understand the link between H and C cycles in the soil. The use of C stable isotopes is widely used to investigate sources, evolution, and dynamics of SOM, whilst H stable isotopes provide geographical information and insight into the water dynamics in soils [3]. This communication describes a methodology based on analytical pyrolysis for the direct measure of lignin-derived phenolic compounds specific ¿13C and ¿2H isotope composition (Py-CSIA). Based on this methodology, we aim to evaluate the ¿13C and ¿2H isotope composition of lignin-derived phenols as biomarkers of changes in SOM dynamics driven by climatic factors. Composite dehesa surface (0-10 cm) soil samples (Pozoblanco, Córdoba, Spain) were taken from four forced climatic treatment plots representing warming (W), drought (D), its combination (W+D), and control (D), in two distinct habitats: under evergreen oak canopy and in open pasture. The samples were analysed in triplicate for chemical structural characterization by analytical pyrolysis (Py-GC/MS) and in parallel for ¿13C and ¿2H (Py-CSIA) using the same chromatographic conditions. The ¿13C average CSIA values ranged from -27.15 ¿ to -33.45 ¿. Significant differences are reportedly driven by the differences in habitat: more depleted values were found in lignin produced in the open pasture than in tree habitat. In addition to the differences reported for habitats, it is observed an 13C enrichment (up to ... |
| نوع الوثيقة: | conference object |
| اللغة: | unknown |
| Relation: | Sí; XX Meeting of the Spanish Society of Chromatography and Related Techniques SECyTA2021. Book of Abstracts WC-E12 pág. 43 (2021); http://hdl.handle.net/10261/278049; http://dx.doi.org/10.13039/501100000780; http://dx.doi.org/10.13039/501100011011 |
| DOI: | 10.13039/501100000780 |
| DOI: | 10.13039/501100011011 |
| الاتاحة: | http://hdl.handle.net/10261/278049 https://doi.org/10.13039/501100000780 https://doi.org/10.13039/501100011011 |
| Rights: | open |
| رقم الانضمام: | edsbas.F494948A |
| قاعدة البيانات: | BASE |
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