Decadal-scale litter manipulation alters the biochemical and physical character of tropical forest soil carbon

Cusack, Daniela F.; Halterman, Sarah M.; Tanner, Edmund V.J.; Wright, S. Joseph; Hockaday, William; Dietterich, Lee H.; Turner, Benjamin L.

doi:10.1016/j.soilbio.2018.06.005

Decadal-scale litter manipulation alters the biochemical and physical character of tropical forest soil carbon

Journal Article · Sat Jun 23 00:00:00 EDT 2018 · Soil Biology and Biochemistry

DOI:https://doi.org/10.1016/j.soilbio.2018.06.005· OSTI ID:1924482

^[1]; Halterman, Sarah M. ^[2]; Tanner, Edmund V.J. ^[3]; Wright, S. Joseph ^[4]; ^[5]; Dietterich, Lee H. ^[2]; Turner, Benjamin L. ^[4]

Univ. of California, Los Angeles, CA (United States); Colorado State University
Univ. of California, Los Angeles, CA (United States)
Univ. of Cambridge (United Kingdom)
Smithsonian Tropical Research Inst., Ancon (Panama)
Baylor Univ., Waco, TX (United States)

Climate change and rising atmospheric carbon dioxide (CO₂) concentrations are likely to alter tropical forest net primary productivity (NPP), potentially affecting soil C storage. We examined biochemical and physical changes in soil C fractions in a humid tropical forest where experimental litter manipulation changed total soil C stocks. We hypothesized that: (1.) low-density soil organic C (SOC) fractions are more responsive to altered litter inputs than mineral-associated SOC, because they cycle relatively rapidly. (2.) Any accumulation of mineral-associated SOC with litter addition is relatively stable (i.e. low leaching potential). (3.) Certain biomolecules, such as waxes (alkyl) and proteins (N-alkyl), form more stable mineral-associations than other biomolecules in strongly weathered soils. A decade of litter addition and removal affected bulk soil C content in the upper 5 cm by +32% and –31%, respectively. Most notably, C concentration in the mineral-associated SOC fraction was greater in litter addition plots relative to controls by 18% and 28% in the dry and wet seasons, respectively, accounting for the majority of greater bulk soil C stock. Radiocarbon and leaching analyses demonstrated that the greater mineral-associated SOC in litter addition plots consisted of new and relatively stable C, with only 3% of mineral-associated SOC leachable in salt solution. Solid-state ¹³C NMR spectroscopy indicated that waxes (alkyl C) and microbial biomass compounds (O-alkyl and N-alkyl C) in mineral-associated SOC are relatively stable, whereas plant-derived compounds (aromatic and phenolic C) are lost from mineral associations on decadal timescales. Here, we conclude that changes in tropical forest NPP will alter the quantity, biochemistry, and stability of C stored in strongly weathered tropical soils.

View Accepted Manuscript (DOE)

Research Organization:: Colorado State Univ., Fort Collins, CO (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Biological and Environmental Research (BER). Earth and Environmental Systems Science Division; National Science Foundation (NSF)

Grant/Contract Number:: SC0020669; SC0015898

OSTI ID:: 1924482

Alternate ID(s):: OSTI ID: 1809300
OSTI ID: 1538829

Journal Information:: Soil Biology and Biochemistry, Journal Name: Soil Biology and Biochemistry Vol. 124; ISSN 0038-0717

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

References (70)

Seasonal soil aggregate stability variation in relation to rainfall and temperature under Mediterranean conditions Dimoyiannis, D. Earth Surface Processes and Landforms, Vol. 34, Issue 6 https://doi.org/10.1002/esp.1785	journal	May 2009
High sensitivity of a tropical rainforest to water variability: Evidence from 10 years of inventory and eddy flux data: DROUGHT AND TROPICAL RAINFOREST Tan, Zheng-Hong; Cao, Min; Yu, Gui-Rui Journal of Geophysical Research: Atmospheres, Vol. 118, Issue 16 https://doi.org/10.1002/jgrd.50675	journal	August 2013
Field-quantified responses of tropical rainforest aboveground productivity to increasing CO ₂ and climatic stress, 1997-2009 : TROPICAL RAINFOREST PRODUCTIVITY RESPONSES Clark, Deborah A.; Clark, David B.; Oberbauer, Steven F. Journal of Geophysical Research: Biogeosciences, Vol. 118, Issue 2 https://doi.org/10.1002/jgrg.20067	journal	May 2013
Aspects of the chemical structure of soil organic materials as revealed by solid-state13C NMR spectroscopy Baldock, J. A.; Oades, J. M.; Waters, A. G. Biogeochemistry, Vol. 16, Issue 1 https://doi.org/10.1007/BF02402261	journal	February 1992
Chemical Changes During 6 Years of Decomposition of 11 Litters in Some Canadian Forest Sites. Part 2. 13C Abundance, Solid-State 13C NMR Spectroscopy and the Meaning of “Lignin” Preston, Caroline M.; Nault, Jason R.; Trofymow, J. A. Ecosystems, Vol. 12, Issue 7 https://doi.org/10.1007/s10021-009-9267-z	journal	September 2009
A conceptual model of organo-mineral interactions in soils: self-assembly of organic molecular fragments into zonal structures on mineral surfaces Kleber, M.; Sollins, P.; Sutton, R. Biogeochemistry, Vol. 85, Issue 1 https://doi.org/10.1007/s10533-007-9103-5	journal	June 2007
Effects of nitrogen additions on above- and belowground carbon dynamics in two tropical forests Cusack, Daniela F.; Silver, Whendee L.; Torn, Margaret S. Biogeochemistry, Vol. 104, Issue 1-3 https://doi.org/10.1007/s10533-010-9496-4	journal	July 2010
Seasonal changes in soil organic matter after a decade of nutrient addition in a lowland tropical forest Turner, Benjamin L.; Yavitt, Joseph B.; Harms, Kyle E. Biogeochemistry, Vol. 123, Issue 1-2 https://doi.org/10.1007/s10533-014-0064-1	journal	January 2015
Changes to particulate versus mineral-associated soil carbon after 50 years of litter manipulation in forest and prairie experimental ecosystems Lajtha, Kate; Townsend, Kimberly L.; Kramer, Marc G. Biogeochemistry, Vol. 119, Issue 1-3 https://doi.org/10.1007/s10533-014-9970-5	journal	March 2014
Are oxygen limitations under recognized regulators of organic carbon turnover in upland soils? Keiluweit, Marco; Nico, Peter S.; Kleber, Markus Biogeochemistry, Vol. 127, Issue 2-3 https://doi.org/10.1007/s10533-015-0180-6	journal	January 2016
Soil carbon stocks across tropical forests of Panama regulated by base cation effects on fine roots Cusack, Daniela F.; Markesteijn, Lars; Condit, Richard Biogeochemistry, Vol. 137, Issue 1-2 https://doi.org/10.1007/s10533-017-0416-8	journal	January 2018
Soil microbial community composition rather than litter quality is linked with soil organic carbon chemical composition in plantations in subtropical China Wang, Hui; Liu, Shirong; Chang, Scott X. Journal of Soils and Sediments, Vol. 15, Issue 5 https://doi.org/10.1007/s11368-015-1118-2	journal	April 2015
Surface charge characteristics of kaolinitic tropical soils Chorover, Jon; Sposito, Garrison Geochimica et Cosmochimica Acta, Vol. 59, Issue 5 https://doi.org/10.1016/0016-7037(94)00357-2	journal	March 1995
Extractant ph and the release of phenolic compounds from soils, plant roots and leaf litter Whitehead, D. C.; Dibb, Hazel; Hartley, R. D. Soil Biology and Biochemistry, Vol. 13, Issue 5 https://doi.org/10.1016/0038-0717(81)90074-2	journal	January 1981
Rapid stabilization and mobilization of 15N in forest and range soils Strickland, Timothy C.; Sollins, Phillip; Rudd, Nathan Soil Biology and Biochemistry, Vol. 24, Issue 9 https://doi.org/10.1016/0038-0717(92)90005-I	journal	September 1992
Performance of catalytically condensed carbon for use in accelerator mass spectrometry Vogel, J. S.; Southon, J. R.; Nelson, D. E. Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, Vol. 5, Issue 2 https://doi.org/10.1016/0168-583X(84)90529-9	journal	November 1984
The macromolecular organic composition of plant and microbial residues as inputs to soil organic matter Kögel-Knabner, I. Soil Biology and Biochemistry, Vol. 34, Issue 2 https://doi.org/10.1016/S0038-0717(01)00158-4	journal	February 2002
13C NMR assessment of decomposition patterns during composting of forest and shrub biomass Almendros, G.; Dorado, J.; González-Vila, F. J. Soil Biology and Biochemistry, Vol. 32, Issue 6 https://doi.org/10.1016/S0038-0717(99)00202-3	journal	June 2000
Black carbon in density fractions of anthropogenic soils of the Brazilian Amazon region Glaser, Bruno; Balashov, Eugene; Haumaier, Ludwig Organic Geochemistry, Vol. 31, Issue 7-8 https://doi.org/10.1016/S0146-6380(00)00044-9	journal	July 2000
Demineralization of marine and freshwater sediments for CP/MAS 13C NMR analysis Gélinas, Yves; Baldock, Jeff A.; Hedges, John I. Organic Geochemistry, Vol. 32, Issue 5 https://doi.org/10.1016/S0146-6380(01)00018-3	journal	May 2001
Sorption of natural organic matter fractions to goethite (α-FeOOH): effect of chemical composition as revealed by liquid-state 13C NMR and wet-chemical analysis Kaiser, Klaus Organic Geochemistry, Vol. 34, Issue 11 https://doi.org/10.1016/S0146-6380(03)00120-7	journal	November 2003
Mineral–Organic Associations: Formation, Properties, and Relevance in Soil Environments Kleber, Markus; Eusterhues, Karin; Keiluweit, Marco https://doi.org/10.1016/bs.agron.2014.10.005	book	December 2014
Thermodynamic limitations on microbially catalyzed reaction rates LaRowe, Douglas E.; Dale, Andrew W.; Amend, Jan P. Geochimica et Cosmochimica Acta, Vol. 90 https://doi.org/10.1016/j.gca.2012.05.011	journal	August 2012
Initial characterization of processes of soil carbon stabilization using forest stand-level radiocarbon enrichment Swanston, Christopher W.; Torn, Margaret S.; Hanson, Paul J. Geoderma, Vol. 128, Issue 1-2 https://doi.org/10.1016/j.geoderma.2004.12.015	journal	September 2005
Chemical and mineral control of soil carbon turnover in abandoned tropical pastures Marín-Spiotta, Erika; Swanston, Christopher W.; Torn, Margaret S. Geoderma, Vol. 143, Issue 1-2 https://doi.org/10.1016/j.geoderma.2007.10.001	journal	January 2008
Soil organic matter accumulation in relation to changing soil volume, mass, and structure: Concepts and calculations Sollins, Phillip; Gregg, Jillian W. Geoderma, Vol. 301 https://doi.org/10.1016/j.geoderma.2017.04.013	journal	September 2017
Transfer of litter-derived N to soil mineral–organic associations: Evidence from decadal 15N tracer experiments Hatton, Pierre-Joseph; Kleber, Markus; Zeller, Bernd Organic Geochemistry, Vol. 42, Issue 12 https://doi.org/10.1016/j.orggeochem.2011.05.002	journal	January 2012
Organic C and N stabilization in a forest soil: Evidence from sequential density fractionation Sollins, Phillip; Swanston, Christopher; Kleber, Markus Soil Biology and Biochemistry, Vol. 38, Issue 11 https://doi.org/10.1016/j.soilbio.2006.04.014	journal	November 2006
Decomposition of black locust and black pine leaf litter in two coeval forest stands on Mount Vesuvius and dynamics of organic components assessed through proximate analysis and NMR spectroscopy De Marco, Anna; Spaccini, Riccardo; Vittozzi, Paola Soil Biology and Biochemistry, Vol. 51 https://doi.org/10.1016/j.soilbio.2012.03.025	journal	August 2012
Competitive sorption of microbial metabolites on an iron oxide mineral Swenson, Tami L.; Bowen, Benjamin P.; Nico, Peter S. Soil Biology and Biochemistry, Vol. 90 https://doi.org/10.1016/j.soilbio.2015.07.022	journal	November 2015
Comparison of Fractionation Methods for Soil Organic Matter ¹⁴ C Analysis Trumbore, Susan E.; Zheng, Shuhui Radiocarbon, Vol. 38, Issue 2 https://doi.org/10.1017/S0033822200017598	journal	January 1996
Using experimental manipulation to assess the roles of leaf litter in the functioning of forest ecosystems Sayer, Emma J. Biological Reviews, Vol. 81, Issue 01 https://doi.org/10.1017/S1464793105006846	journal	September 2005
Turnover and storage of C and N in five density fractions from California annual grassland surface soils: TURNOVER AND STORAGE OF C AND N Baisden, W. T.; Amundson, R.; Cook, A. C. Global Biogeochemical Cycles, Vol. 16, Issue 4 https://doi.org/10.1029/2001GB001822	journal	December 2002
Measurement of soil carbon oxidation state and oxidative ratio by ¹³ C nuclear magnetic resonance: SOIL C OXIDATION STATE Hockaday, W. C.; Masiello, C. A.; Randerson, J. T. Journal of Geophysical Research: Biogeosciences, Vol. 114, Issue G2 https://doi.org/10.1029/2008JG000803	journal	May 2009
Comparison of carbon dynamics in tropical and temperate soils using radiocarbon measurements Trumbore, Susan E. Global Biogeochemical Cycles, Vol. 7, Issue 2 https://doi.org/10.1029/93GB00468	journal	June 1993
Mineral control of soil organic carbon storage and turnover Torn, Margaret S.; Trumbore, Susan E.; Chadwick, Oliver A. Nature, Vol. 389, Issue 6647 https://doi.org/10.1038/38260	journal	September 1997
Persistence of soil organic matter as an ecosystem property Schmidt, Michael W. I.; Torn, Margaret S.; Abiven, Samuel Nature, Vol. 478, Issue 7367 https://doi.org/10.1038/nature10386	journal	October 2011
The contentious nature of soil organic matter Lehmann, Johannes; Kleber, Markus Nature, Vol. 528, Issue 7580 https://doi.org/10.1038/nature16069	journal	November 2015
Soil carbon release enhanced by increased tropical forest litterfall Sayer, Emma J.; Heard, Matthew S.; Grant, Helen K. Nature Climate Change, Vol. 1, Issue 6 https://doi.org/10.1038/nclimate1190	journal	August 2011
Changes in rainfall seasonality in the tropics Feng, Xue; Porporato, Amilcare; Rodriguez-Iturbe, Ignacio Nature Climate Change, Vol. 3, Issue 9 https://doi.org/10.1038/nclimate1907	journal	May 2013
Projected strengthening of Amazonian dry season by constrained climate model simulations Boisier, Juan P.; Ciais, Philippe; Ducharne, Agnès Nature Climate Change, Vol. 5, Issue 7 https://doi.org/10.1038/nclimate2658	journal	June 2015
Direct evidence for microbial-derived soil organic matter formation and its ecophysiological controls Kallenbach, Cynthia M.; Frey, Serita D.; Grandy, A. Stuart Nature Communications, Vol. 7, Issue 1 https://doi.org/10.1038/ncomms13630	journal	November 2016
Formation of soil organic matter via biochemical and physical pathways of litter mass loss Cotrufo, M. Francesca; Soong, Jennifer L.; Horton, Andrew J. Nature Geoscience, Vol. 8, Issue 10 https://doi.org/10.1038/ngeo2520	journal	September 2015
Assessing the extent of decomposition of natural organic materials using solid-state 13C NMR spectroscopy Baldock, J. A.; Oades, J. M.; Nelson, P. N. Soil Research, Vol. 35, Issue 5 https://doi.org/10.1071/S97004	journal	January 1997
Spatial heterogeneity of soil chemical properties in a lowland tropical moist forest, Panama Yavitt, J. B.; Harms, K. E.; Garcia, M. N. Soil Research, Vol. 47, Issue 7 https://doi.org/10.1071/SR08258	journal	January 2009
Study of free and occluded particulate organic matter in soils by solid state 13C Cp/MAS NMR spectroscopy and scanning electron microscopy Golchin, A.; Oades, Jm; Skjemstad, Jo Soil Research, Vol. 32, Issue 2 https://doi.org/10.1071/SR9940285	journal	January 1994
Structural and dynamic properties of soil organic-matter as reflected by 13C natural-abundance, pyrolysis mass-spectrometry and solid-state 13C NMR-spectroscopy in density fractions of an oxisol under forest and pasture Golchin, A.; Oades, Jm; Skjemstad, Jo Soil Research, Vol. 33, Issue 1 https://doi.org/10.1071/SR9950059	journal	January 1995
A time for every season: soil aggregate turnover stimulates decomposition and reduces carbon loss in grasslands managed for bioenergy Bach, Elizabeth M.; Hofmockel, Kirsten S. GCB Bioenergy, Vol. 8, Issue 3 https://doi.org/10.1111/gcbb.12267	journal	June 2015
Improvement of 13C and 15N CPMAS NMR spectra of bulk soils, particle size fractions and organic material by treatment with 10% hydrofluoric acid Schmidt, M. W. I.; Knicker, H.; Hatcher, P. G. European Journal of Soil Science, Vol. 48, Issue 2 https://doi.org/10.1111/j.1365-2389.1997.tb00552.x	journal	June 1997
Stabilization of organic matter in temperate soils: mechanisms and their relevance under different soil conditions - a review Lutzow, M. v.; Kogel-Knabner, I.; Ekschmitt, K. European Journal of Soil Science, Vol. 57, Issue 4 https://doi.org/10.1111/j.1365-2389.2006.00809.x	journal	August 2006
Soil organic phosphorus dynamics following perturbation of litter cycling in a tropical moist forest Vincent, A. G.; Turner, B. L.; Tanner, E. V. J. European Journal of Soil Science, Vol. 61, Issue 1 https://doi.org/10.1111/j.1365-2389.2009.01200.x	journal	February 2010
Soil organic matter dynamics during 80 years of reforestation of tropical pastures Marin-Spiotta, Erika; Silver, Whendee L.; Swanston, Christopher W. Global Change Biology, Vol. 15, Issue 6 https://doi.org/10.1111/j.1365-2486.2008.01805.x	journal	June 2009
Experimental litterfall manipulation drives large and rapid changes in soil carbon cycling in a wet tropical forest Leff, Jonathan W.; Wieder, William R.; Taylor, Philip G. Global Change Biology, Vol. 18, Issue 9 https://doi.org/10.1111/j.1365-2486.2012.02749.x	journal	June 2012
Drought and Irrigation Effects on Fine Root Dynamics in a Tropical Moist Forest, Panama1 Yavitt, Joseph B.; Wright, S. Joseph Biotropica, Vol. 33, Issue 3 https://doi.org/10.1111/j.1744-7429.2001.tb00196.x	journal	September 2001
Nature of the “occluded” low-density fraction in soil organic matter studies: A critical review Wagai, Rota; Mayer, Lawrence M.; Kitayama, Kanehiro Soil Science and Plant Nutrition, Vol. 55, Issue 1 https://doi.org/10.1111/j.1747-0765.2008.00356.x	journal	February 2009
Climate-Driven Increases in Global Terrestrial Net Primary Production from 1982 to 1999 Nemani, R. R. Science, Vol. 300, Issue 5625 https://doi.org/10.1126/science.1082750	journal	June 2003
Changing Ecology of Tropical Forests: Evidence and Drivers Lewis, Simon L.; Lloyd, Jon; Sitch, Stephen Annual Review of Ecology, Evolution, and Systematics, Vol. 40, Issue 1 https://doi.org/10.1146/annurev.ecolsys.39.110707.173345	journal	December 2009
Changes in microbial community characteristics and soil organic matter with nitrogen additions in two tropical forests Cusack, Daniela F.; Silver, Whendee L.; Torn, Margaret S. Ecology, Vol. 92, Issue 3 https://doi.org/10.1890/10-0459.1	journal	March 2011
Age of soil Organic Matter and soil Respiration: Radiocarbon Constraints on Belowground c Dynamics Trumbore, Susan Ecological Applications, Vol. 10, Issue 2 https://doi.org/10.1890/1051-0761(2000)010[0399:AOSOMA]2.0.CO;2	journal	April 2000
The Vertical Distribution of soil Organic Carbon and its Relation to Climate and Vegetation Jobbágy, Esteban G.; Jackson, Robert B. Ecological Applications, Vol. 10, Issue 2 https://doi.org/10.1890/1051-0761(2000)010[0423:TVDOSO]2.0.CO;2	journal	April 2000
Phosphate Adsorption and Desorption by Goethites Differing in Crystal Morphology Torrent, J.; Barrón, V.; Schwertmann, U. Soil Science Society of America Journal, Vol. 54, Issue 4 https://doi.org/10.2136/sssaj1990.03615995005400040012x	journal	July 1990
Release of Natural Organic Matter Sorbed to Oxides and a Subsoil Kaiser, K.; Zech, W. Soil Science Society of America Journal, Vol. 63, Issue 5 https://doi.org/10.2136/sssaj1999.6351157x	journal	January 1999
Tropical Forest Litter Dynamics and Dry Season Irrigation on Barro Colorado Island, Panama Wieder, R. Kelman; Wright, S. Joseph Ecology, Vol. 76, Issue 6 https://doi.org/10.2307/1940727	journal	September 1995
Herbivory and Defensive Characteristics of Tree Species in a Lowland Tropical Forest Coley, Phyllis D. Ecological Monographs, Vol. 53, Issue 2 https://doi.org/10.2307/1942495	journal	February 1983
Variability of above-ground litter inputs alters soil physicochemical and biological processes: a meta-analysis of litterfall-manipulation experiments Xu, S.; Liu, L. L.; Sayer, E. J. Biogeosciences, Vol. 10, Issue 11 https://doi.org/10.5194/bg-10-7423-2013	journal	January 2013
A dual isotope approach to isolate soil carbon pools of different turnover times Torn, M. S.; Kleber, M.; Zavaleta, E. S. Biogeosciences, Vol. 10, Issue 12 https://doi.org/10.5194/bg-10-8067-2013	journal	January 2013
Large fluxes and rapid turnover of mineral-associated carbon across topographic gradients in a humid tropical forest: insights from paired ¹⁴ C analysis Hall, S. J.; McNicol, G.; Natake, T. Biogeosciences, Vol. 12, Issue 8 https://doi.org/10.5194/bg-12-2471-2015	journal	January 2015
Changes in soil carbon and nutrients following 6 years of litter removal and addition in a tropical semi-evergreen rain forest Tanner, Edmund Vincent John; Sheldrake, Merlin W. A.; Turner, Benjamin L. Biogeosciences, Vol. 13, Issue 22 https://doi.org/10.5194/bg-13-6183-2016	journal	January 2016
Density fractions versus size separates: does physical fractionation isolate functional soil compartments? Moni, C.; Derrien, D.; Hatton, P. -J. Biogeosciences, Vol. 9, Issue 12 https://doi.org/10.5194/bg-9-5181-2012	journal	January 2012
Climate and moisture variability in a tropical forest : long-term records from Barro Colorado Island, PanamÃ¡ Windsor, Donald M. Smithsonian Contributions to the Earth Sciences, Vol. 29 https://doi.org/10.5479/si.00810274.29.1	journal	January 1990

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