Abstract
Dissolved organic carbon (DOC) flux is an important mechanism to convey soil carbon (C) from aboveground organic debris (litter) to deeper soil horizons and can influence the formation of stable soil organic C compounds. The magnitude of this flux depends on both infiltration and DOC production rates which are functions of the climatic, soil, topographic and ecological characteristics of a region. Aboveground litter quantity and quality was manipulated for 20 years in an old-growth Douglas fir forest under six treatments to study relationships among litter inputs, DOC production and flux, and soil C dynamics. DOC concentrations were measured at two depths using tension lysimeters, and a hydrologic model was created to quantify water and DOC flux through the soil profile. DOC concentrations ranged from 3.0–8.0 and 1.5–2.5 mg C/L among treatments at 30 and 100 cm below the soil surface, respectively. Aboveground detrital inputs did not have a consistent positive effect on soil solution DOC; the addition of coarse woody debris increased soil solution DOC by 58% 30 cm belowground, while doubling the mass of aboveground leaf litter decreased DOC concentrations by 30%. We suggest that high-quality leaf litter accelerated microbial processing, resulting in a “priming” effect that led to the lower concentrations. Annual DOC flux into groundwater was small (2.7–3.7 g C/m2/year) and accounts for < 0.1% of estimated litter C at the site. Therefore, direct DOC loss from surface litter to groundwater is relatively negligible to the soil C budget. However, DOC flux into the soil surface was much greater (73–210 g C/m2/year), equivalent to 1.4–2.4% of aboveground litter C. Therefore, DOC transport is an important source of C to shallow soil horizons.
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References
Bates D, Mächler M, Bolker B, Walker S (2014) Fitting linear mixed-effects models using lme4. arXiv preprint arXiv:1406.5823
Bradford MA, Keiser AD, Davies CA et al (2013) Empirical evidence that soil carbon formation from plant inputs is positively related to microbial growth. Biogeochemistry (Dordr) 113:271–281. https://doi.org/10.1007/s10533-012-9822-0
Cleveland CC, Neff JC, Townsend AR, Hood E (2004) Composition, dynamics, and fate of leached dissolved organic matter in terrestrial ecosystems: results from a decomposition experiment. Ecosystems 7:175–285. https://doi.org/10.1007/s10021-003-0236-7
Córdova SC, Olk DC, Dietzel RN, Mueller KE, Archontouilis SV, Castellano MJ (2018) Plant litter quality affects the accumulation rate, composition, and stability of mineral-associated soil organic matter. Soil Biol Biochem 125:115–124. https://doi.org/10.1016/j.soilbio.2018.07.010
Cotrufo MF, Wallenstein MD, Boot CM et al (2013) The Microbial Efficiency-Matrix Stabilization (MEMS) framework integrates plant litter decomposition with soil organic matter stabilization: do labile plant inputs form stable soil organic matter? Glob Change Biol 19:988–995. https://doi.org/10.1111/gcb.12113
Creed IF, Beall FD, Clair TA et al (2008) Predicting export of dissolved organic carbon from forested catchments in glaciated landscapes with shallow soils. Glob Biogeochem Cycles. https://doi.org/10.1029/2008GB003294
Crow SE, Lajtha K, Bowden RD et al (2009a) Increased coniferous needle inputs accelerate decomposition of soil carbon in an old-growth forest. For Ecol Manag 258:2224–2232. https://doi.org/10.1016/j.foreco.2009.01.014
Crow SE, Lajtha K, Filley TR et al (2009b) Sources of plant-derived carbon and stability of organic matter in soil: implications for global change. Glob Change Biol 15:2003–2019. https://doi.org/10.1111/j.1365-2486.2009.01850.x
Daly C (2019) Andrews data catalog. HJ Andrews Experimental Forest Long-Term Ecological Research
Feddes RA, Kowalik PJ, Zaradny H (1978) Simulation of field water use and crop yield. Center for Agricultural Publishing and Documentation, Wageningen
Fellman JB, Hood E, D’amore DV et al (2009) Seasonal changes in the chemical quality and biodegradability of dissolved organic matter exported from soils to streams in coastal temperate rainforest watersheds. Biogeochemistry (Dordr) 95:277–293. https://doi.org/10.1007/s10533-009-9336-6
Fröberg M, Berggren D, Bergkvist B et al (2006) Concentration and fluxes of dissolved organic carbon (DOC) in three Norway spruce stands along a climatic gradient in Sweden. Biogeochemistry (Dordr) 77:1–23. https://doi.org/10.1007/s10533-004-0564-5
Green WH, Ampt GA (1911) Studies on soil physics. J Agric Sci 4:1–24. https://doi.org/10.1017/S0021859600001441
Hagedorn F, Bundt M (2002) The age of preferential flow paths. Geoderma 108:119–132. https://doi.org/10.1016/S0016-7061(02)00129-5
Kung K-JS (1990a) Preferential flow in a sandy vadose zone: 2. Mechanism and implications. Geoderma 46:59–71. https://doi.org/10.1016/0016-7061(90)90007-V
Kung K-JS (1990b) Preferential flow in a sandy vadose zone: 1. Field observation. Geoderma 46:51–58. https://doi.org/10.1016/0016-7061(90)90006-U
Lajtha K, Jarrell WM, Johnson DW et al (1999) Collection of soil solution. In: Standard soil methods for long-term ecological research, vol 2. Oxford University Press, Oxford, pp 166–182
Lajtha K, Crow SE, Yano Y et al (2005) Detrital controls on soil solution N and dissolved organic matter in soils: a field experiment. Biogeochemistry 76:261–281. https://doi.org/10.1007/s10533-005-5071-9
Lajtha K, Bowden RD, Crow S et al (2018) The detrital input and removal treatment (DIRT) network: insights into soil carbon stabilization. Sci Total Environ 640–641:1112–1120. https://doi.org/10.1016/j.scitotenv.2018.05.388
Laudon H, Köhler S, Buffam I (2004) Seasonal TOC export from seven boreal catchments in northern Sweden. Aquat Sci 66:223–230. https://doi.org/10.1007/s00027-004-0700-2
Lee M-H, Park J-H, Matzner E (2018) Sustained production of dissolved organic carbon and nitrogen in forest floors during continuous leaching. Geoderma 310:163–169. https://doi.org/10.1016/j.geoderma.2017.07.027
McMinn RG (1963) Characteristics of Douglas-fir root systems. Can J Bot 41:105–122. https://doi.org/10.1139/b63-010
Melillo JM, McGuire AD, Kicklighter DW et al (1993) Global climate change and terrestrial net primary production. Nature 363:234–240. https://doi.org/10.1038/363234a0
Pan Y, Birdsey RA, Fang J et al (2011) A large and persistent carbon sink in the world’s forests. Science 333:988–993. https://doi.org/10.1126/science.1201609
R Core Team (2019) R: a language and environment for statistical computing. R Foundation for Statistical Computing, Vienna
Ritsema CJ, Dekker LW, Hendrickx JMH, Hamminga W (1993) Preferential flow mechanism in a water repellent sandy soil. Water Resour Res 29:2183–2193. https://doi.org/10.1029/93WR00394
Schimel D, Melillo J, Tian H et al (2000) Contribution of increasing CO2 and climate to carbon storage by ecosystems in the United States. Science 287:2004–2006. https://doi.org/10.1126/science.287.5460.2004
Schlesinger W (1997) The biosphere: biogeochemical cycling on land. Academic, San Diego
Simunek J, Sejna M, Saito H et al (2013) The Hydrus-1D software package for simulating the movement of water, heat, and multiple solutes in variably saturated media. Version 4.17. PC-Progress, Department of Environmental Sciences, University of California Riverside, Riverside
Solinger S, Kalbitz K, Matzner E (2001) Controls on the dynamics of dissolved organic carbon and nitrogen in a Central European deciduous forest. Biogeochemistry 55:327–349. https://doi.org/10.1023/A:1011848326013
Sollins P, Grier CC, McCorison FM et al (1980) The internal element cycles of an old-growth Douglas-fir ecosystem in western Oregon. Ecol Monogr 50:261–285. https://doi.org/10.2307/2937252
Spears J, Lajtha K (2004) The imprint of coarse woody debris on soil chemistry in the western Oregon Cascades. Biogeochemistry 71:163–175. https://doi.org/10.1007/s10533-004-6395-6
Strid A, Lee BS, Lajtha K (2016) Homogenization of detrital leachate in an old-growth coniferous forest, OR: DOC fluorescence signatures in soils undergoing long-term litter manipulations. Plant Soil 408:133–148. https://doi.org/10.1007/s11104-016-2914-1
Sulzman EW, Brant JB, Bowden RD, Lajtha K (2005) Contribution of aboveground litter, belowground litter, and rhizosphere respiration to total soil CO2 efflux in an old growth coniferous forest. Biogeochemistry 73:231–256. https://doi.org/10.1007/s10533-004-7314-6
Yano Y, Lajtha K, Sollins P, Caldwell BA (2005) Chemistry and dynamics of dissolved organic matter in a temperate coniferous forest on Andic soils: effects of litter quality. Ecosystems 8:286–300. https://doi.org/10.1007/s10021-005-0022-9
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Funding was provided by NSF DEB-1257032 to Kate Lajtha and DEB 1440409 to the H.J. Andrews LTER.
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Evans, L.R., Pierson, D. & Lajtha, K. Dissolved organic carbon production and flux under long-term litter manipulations in a Pacific Northwest old-growth forest. Biogeochemistry 149, 75–86 (2020). https://doi.org/10.1007/s10533-020-00667-6
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DOI: https://doi.org/10.1007/s10533-020-00667-6