Tree taxa and pyrolysis temperature interact to control the efficacy of pyrogenic organic matter formation
We know little about how shifts in tree species distribution and increases in forest fire intensity could affect the formation of pyrogenic organic matter (PyOM) or charcoal, one of the most important and persistent soil organic matter pools. This limitation arises partly because the role of the precursor wood in controlling PyOM formation is unclear. The current study shows how tree species and pyrolysis temperature (200, 300, 450 and 600 °C) interact to control the physicochemical structure of the PyOM experimentally derived from 13C/15N-enriched Pinus banksania and Acer rubrum, two important co-occurring gymnosperm and angiosperm tree species from North American boreal-temperate ecotones. Complementary physicochemical and thermodynamic measurements revealed different susceptibilities of the two wood species to charring, with PyOM intermediates formed at lower temperature from the pine, indicating that the tree species regulated the efficacy of PyOM formation. Particularly, we report high-resolution data describing the comprehensive chemical architecture of PyOM (both –C and –N) as they are formed, which are complemented by unique molecular-level insights on their labile fractions. We posit that the tree species and pyrolysis temperature interaction reflects distinctive anatomical features of the two major tree taxa, including greater effective porosity in gymnosperms that promote the loss of volatiles and enhance the heat exposure of bio-components. This study points to a higher temperature threshold for PyOM production in maple forests compared with pine forests, resulting in potentially more degradable and less sorbtive PyOM in ecotones dominated by the former species.
KeywordsChar Black C Wood NMR TMAH
Pyrogenic organic matter
- BET–N2 SA
Brunauer-Emmett-Teller–N2 surface area
Solid-state nuclear magnetic resonance
Cross polarization-magic-angle spinning
Direct polarization-magic-angle spinning
Diffuse reflectance infrared Fourier transmission
13C-labeled tetramethylammonium hydroxide
This research was supported by the National Science Foundation (DEB-1127253). The NMR resources were supported by The City College of New York (CCNY) and the CUNY Institute of Macromolecular Assemblies, with infrastructural assistance provided by the National Institutes of Health through the National Institute on Minority Health and Health Disparities (8G12 MD007603). We are grateful to F. Santos for growing the RM, B. Dewey for performing the proximate C analyses and to the UC Davis Stable Isotope Facility for isotope analyses. We thank the anonymous reviewers for their constructive comments.
JAB, TRF and KJN conceived and designed the study. PJH analyzed the data and was the primary author of the manuscript. RES and SC designed the NMR experiments, which were performed and analyzed by SC, KD, and RES. TRF did the 13C-TMAH measurements. AFP did the thermal analyses. SA did the DRIFT measurements. XG and CM did the pycnometry and SA measurements. SL did the cellulose extractions. The manuscript was written through contributions of all authors. All authors contributed to interpreting the data and editing the manuscript. All authors have given approval to the final version of the manuscript.
National Science Foundation (DEB-1127253).
- Barnes BV (2009) Tree response to ecosystem change at the landscape level in Eastern North America. Forstarchiv 80:76–89Google Scholar
- Beall FC, Eickner HW (1970) Thermal degradation of wood components: a review of the literature. In: USDA Forest service (ed) FLP 130, p 1–29Google Scholar
- Beaumont O, Schwob Y (1984) Influence of physical and chemical parameters on wood pyrolysis. Ind Eng Chem Res 23:627Google Scholar
- Bond TC, Doherty SJ, Fahey DW, Forster PM, Berntsen T, DeAngelo BJ, Flanner MG, Ghan S, Karcher B, Koch D, Kinne S, Kondo Y, Quinn PK, Sarofim MC, Schultz MG, Schultz M, Venkataraman C, Zhang H, Zhang S, Bellouin N, Guttikunda SK, Hopke PK, Jacobson MZ, Kaiser JW, Kilmont Z, Lohmann U, Schwarz JP, Schindell D, Storelvmo T, Warren SG, Zender CS (2013) Bounding the role of black carbon in the climate system: a scientific assessment. J Geophys Res Atmos 118:5380–5552CrossRefGoogle Scholar
- Bredu M, Vasile C (2010) Thermal alteration of lignin—a review. Cellul Chem Technol 44(9):353–363Google Scholar
- FAO (2010) Global forest resources assessement. In: FAO, RomeGoogle Scholar
- Gärdenas AI, Agren GI, Bird JA, Clarholm M, Hallin S, Ineson P, Katterer T, Knicker H, Nilsson SI, Nasholm T, Ogle S, Paustian K, Persson T, Stendahl J (2011) Knowledge gaps in soil carbon and nitrogen interactions—From molecular to global scale. Soil Biol Biochem 43(4):702–717CrossRefGoogle Scholar
- Hammes K, Schmidt MWI, Smernik RJ, Currie LA, Ball WP, Nguyen TH, Louchouarn P, Houel S, Gustafsson O, Elmquist M, Cornelissen G, Skjemstad JO, Masiello CA, Song J, Peng P, Mitra S, Dunn JC, Hatcher PG, Hockaday WC, Smith DM, Hartkopf-Froder C, Bohmer A, Luer B, Huebert BJ, Amelung W, Brodowski S, Huang L, Zhang W, Gschwend PM, Flores-Cervantes DX, Largeau C, Rouzaud JN, Rumpel C, Guggenberger G, Kaiser K, Rodionov A, Gonzalez-Vila FJ, Gonzalez-Perez JA, de la Rosa JM, Manning DAC, Lopez-Capel E, Ding L (2007) Comparison of quantification methods to measure fire-derived (black/elemental) carbon in soils and sediments using reference materials from soil, water, sediment and the atmosphere. Global Biogeochem Cycles 21(GB3016):1–18Google Scholar
- IPCC (2014) Climate change 2014: impacts, adaptation, and vulnerability. In: Field CB, Barros VR, Dokken DJ, Mach KJ, Mastrandrea MD, Bilir TE, Chatterjee M, Ebi KL, Estrada YO, Genova RC, Girma B, Kissel ES, Levy AN, MacCracken S, Mastrandrea PR, White LL (eds) Cambridge University Press, Cambridge, pp 1132Google Scholar
- Newton PF (2012) Simulating site-specific effects of a changing climate on jack pine productivity using a modified variant of the croplanner model. Open J For 2:23–32Google Scholar
- Ryan KC (2002) Dynamic interactions between forest structure and fire behavior in boreal ecosystems. Silv Finn 36(1):13–39Google Scholar
- Singh N, Abiven S, Torn MS, Schmidt MWI (2012b) Fire-derived organic carbon in soil turns over on a centennial scale. Biogeosciences 9:1–11Google Scholar