Abstract
Stream carbon fluxes are one of the major components in the global C cycle, yet the discrimination of the various sources of stream carbon remains to a large extent unclear and less is known about the biogeochemical transformations that accompany the transfer of C from soils to streams. Here, we used patterns in stream water and groundwater δ13C values in a small forested tropical headwater catchment to investigate the source and contribution from the soil carbon pools to stream organic and inorganic carbon behavior over seasonal scales. Stream organic carbon (DOC and POC) comes mainly from the upper rich soil organic carbon horizons and derived from total organic carbon (TOC) of biogenic source. The isotopic compositions δ13CTOC, δ13CDOC and δ13CPOC of these carbon species were very close (− 30‰ to − 26‰) and typical of the forested C3 vegetation. The relationship observed between DOC and log pCO2 and δ13CDIC indicated that besides the considerable CO2 evasion that occurs as DIC is transported from soils to streams, there were also other processes affecting the stream DIC pool. In-stream mineralization of DOC and mixing of atmospheric carbon had a significant influence on the δ13CDIC values. These processes which varied seasonally with hydrological changes represent the main control on DOC and DIC cycling in the wet tropical milieu. The rapid turnover of carbon on hillside soils, the transformation of TOC to DOC in wetland soils and further mineralization of stream DOC to DIC favor the evasion of C, making the zone a source of carbon to the atmosphere.
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Amiotte-Suchet P, Auber D, Probst J-L, Gauthier-Lafaye F, Probst A, Andreux F, Viville D (1999) δ13C pattern of dissolved inorganic carbon in a small granitic catchment: the Strengbach case study (Vosges mountain, France). Chem Geol 159:129–145
Amiotte-Suchet P, Linglois N, Leveque J, Andreux F (2007) 13C composition of dissolved organic carbon in upland forested catchments of the Morvan mountains (France): influence of coniferous and deciduous vegetation. J Hydrol 335:354–363
Amundson R, Stern L, Baisden T, Wang Y (1998) The isotopic composition of soil and soil-respired CO2. Geoderma 82(1–3):83–114
Andersson JO, Nyberg L (2008) Spatial variation of wetlands and flux of dissolved organic carbon in boreal headwater streams. Hydrol Process 22(12):1965–1975
Atekwana EA, Krishnamurthy RV (1998) Seasonal variations of dissolved inorganic carbon and δ13C of surface waters: application of a modified gas evolution technique. J Hydrol 205:265–278
Balakrishna K, Probst J-L (2005) Organic carbon transport and C/N ratio variation in a large tropical river: Godavari as a case study, India. Biogeochemistry 73:457–473
Balesdent J, Mariotti A (1996) Measurement of soil organic matter turnover using 13C natural abundances. In: Boutton TW, Yamasakieds SI (eds) Mass spectrometry of soils. Marcel Dekker Inc., New York, pp 83–111
Bengtson P, Bengtsson G (2007) Rapid turnover of DOC in temperate forests accounts for increased CO2 production at elevated temperatures. Ecol Lett 10(9):783–790
Billett MF, Deacon CM, Palmer SM, Dawson JJC, Hope D (2006) Connecting organic carbon in stream water and soils in a peatland catchment. J Geophys Res 111:G02010
Bird MI, Giresse P, Ngos S (1998) A seasonal cycle in the carbon-isotope composition of organic carbon in the Sanaga River, Cameroon. Limnol Oceanogr 43:143–146
Boeglin J-L, Ndam J-R, Braun J-J (2003) Composition of the different reservoir waters in a tropical humid area: example of the Nsimi catchment (Southern Cameroon). J Afr Earth Sci 37:103–110
Boeglin J-L, Ndam Ngoupayou JR, Nyeck B, Etcheber H, Mortatti J, Braun J-J (2005) Soil carbon stock and river carbon fluxes in a humid tropical environment: the Nyong river basin (South Cameroon). In: Roose E, Lal R, Feller C, Barthès B, Stewart B (eds) Advances in soil science, vol 18. CRC Publisher, Boca Raton, pp 275–288
Braun J-J, Ndam JR, Viers J, Dupré B, Bedimo Bedimo JP, Boeglin J-L, Sigha NL, Freydier R, Robain H, Nyeck B, Rouiller J, Muller JP (2005) Present weathering rates in a humid tropical watershed: Nsimi, South Cameroun. Geochim Cosmochim Acta 69(2):357–387
Braun J-J, Maréchal J-C, Riotte J, Boeglin J-L, Bedimo Bedimo J-P, Ndam Ngoupayou JR, Nyeck B, Robain H, Sekhar M, Audry S, Viers J (2012) Elemental weathering fluxes and saprolite production rate in a Central African lateritic terrain (Nsimi, South Cameroon). Geochim Cosmochim Acta 99:243–270
Brunet F, Gaiero D, Probst J-L, Depetris PJ, Gauthier LF, Stille P (2005) δ13C tracing of dissolved inorganic carbon sources in Patagonian rivers (Argentina). Hydrol Process 19(17):3321–3344
Brunet F, Dubois K, Veizer J, Nkoue Ndondo GR, Ndam Ngoupayou JR, Boeglin JL, Probst J-L (2009) Terrestrial and fluvial carbon fluxes in a tropical watershed: Nyong basin, Cameroon. Chem Geol 265:563–572
Campeau A, Wallin MB, Giesler R, Lofgren S, Morth CM, Schiff S, Venkiteswaran JJ, Bishop K (2017) Multiple sources and sinks of dissolved inorganic carbon across Swedish streams, refocusing the lens of stable C isotopes. Sci Rep 7(1):9158
Campeau A, Bishop K, Nilsson MB, Klemedtsson L, Laudon H, Leith FI, Öquist M, Wallin MB (2018) Stable carbon isotopes reveal soil-stream DIC linkages in contrasting headwater catchments. J Geophys Res Biogeosci. https://doi.org/10.1002/2017JG004083
Caroni R, Free G, Visconti A, Manca M (2012) Phytoplankton functional traits and seston stable isotopes signature: a functional-based approach in a deep, subalpine lake, Lake Maggiore (N. Italy). J Limnol 71(1):84–94
Cerling TE, Solomon DK, Quade J, Bowman JR (1991) On isotopic composition of carbon in soil carbon dioxide. Geochim Cosmochim Acta 55:3403–3405
Coynel A, Seyler P, Etcheber H, Meybeck M, Orange D (2005) Spatial and seasonal dynamics of total suspended sediment and organic carbon species in the Congo River. Glob Biogeochem Cycles 19(4):GB4019
Craig H (1957) The natural distribution of radiocarbon and the exchange time of carbon dioxide between atmosphere and sea. Tellus 9(1):1–17
Crawford JT, Lottig NR, Stanley EH, Walker JF, Hanson PC, Finlay JC, Striegl RG (2014) CO2 and CH4 emissions from streams in a lake-rich landscape: patterns, controls, and regional significance. Glob Biogeochem Cycles 28:197–210
Davidson GR (1995) The stable isotopic composition and measurement of carbon in soil CO2. Geochim Cosmochim Acta 59(12):2485–2489
Day FP, West SK, Tupacz EG (1988) The influence of ground-water dynamics in a periodically flooded ecosystem, the Great Dismal Swamp. Wetlands 8:1–13
Deines P, Langmuir D, Harmon RS (1974) Stable carbon isotope ratios and the existence of a gas phase in the evolution of carbonate ground waters. Geochim Cosmochim Acta 38(7):1147–1164
Dickson AG, Sabine CL, Christian JR (2007) Guide to best practices for ocean CO2 measurements, vol 3. North Pacific Marine Science Organization, Sidney, pp 3–13
Diochon A, Kellman L (2008) Natural abundance measurements of 13C indicate increased deep soil carbon mineralization after forest disturbance. Geophys Res Lett 35:L14402
Doctor DH, Kendall C, Sebestyen SD, Shanley JB, Ote N, Boyer EW (2008) Carbon isotope fractionation of dissolved inorganic carbon (DIC) due to outgassing of carbon dioxide from a headwater stream. Hydrol Process 22(14):2410–2423
Evans CD, Freeman C, Cork LG, Thomas DN, Reynolds B, Billett MF, Garnett MH, Norris D (2007) Evidence against recent climate-induced destabilisation of soil carbon from C-14 analysis of riverine dissolved organic matter. Geophys Res Lett 34:L07407
Feller C, Beare MH (1997) Physical control of soil organic matter dynamics in the tropics. Geoderma 79:69–116
Gao Q, Tao Z, Yao G, Ding J, Liu Z, Liu K (2007) Elemental and isotopic signatures of particulate organic carbon in the Zengjiang River, southern China. Hydrol Process 21:1318–1327
Hotchkiss ER, Hall RO, Sponseller RA, Butman D, Klaminder J, Laudon H, Rosvall M, Karlsson J (2015) Sources of and processes controlling CO2 emissions change with the size of streams and rivers. Nat Geosci 8(9):696–699
Huang W, McDowell WH, Zou X, Ruan H, Wang J, Li L (2013) Dissolved organic carbon in headwater streams and riparian soil organic carbon along an altitudinal gradient in the Wuyi mountains, China. PLoS One 8(11):e78973
Inamdar SP, Mitchell MJ (2006) Hydrologic and topographic controls on stormevent exports of dissolved organic carbon (DOC) and nitrate across catchment scales. Water Resour Res 42:W03421
Keeling CD (1958) The concentration and isotopic abundances of atmospheric carbon dioxide in rural areas. Geochim Cosmochim Acta 13(4):322–334
Koutika L-S, Bartoli F, Andreux F, Cerri CC, Burtin G, Choné T, Philippy R (1997) Organic matter dynamics and aggregation in soils under rain forest and pastures of increasing age in the eastern Amazon Basin. Geoderma 76:87–112
Kroopnick PM, Deuser WG, Graig H (1970) Carbon-13 measurements on dissolved inorganic carbon in the North Pacific (1969) GEOSECS station. J Geophys Res 75:7668–7671
Krüger JP, Leifeld J, Alewell C (2014) Degradation changes stable carbon isotope depth profiles in palsa peatlands. Biogeosciences 11:3369–3380
Lambert T, Pierson-Wickmann A-C, Gruau G, Thibault JN, Jaffrezic A (2011) Carbon isotopes as tracers of dissolved organic carbon sources and water pathways in headwater catchments. J Hydrol 402:228–238
Lambert T, Pierson-Wickmann A-C, Gruau G, Jaffrezic A, Petitjean P, Thibault JN, Jeanneau L (2014) DOC sources and DOC transport pathways in a small headwater catchment as revealed by carbon isotope fluctuation during storm events. Biogeosciences 11:3043–3056
Lapierre JF, Guillemette F, Berggren M, del Giorgio PA (2013) Increases in terrestrially derived carbon stimulate organic carbon processing and CO2 emissions in boreal aquatic ecosystems. Nat Commun 4:1–7
Lauerwald R, Hartmann J, Ludwig W, Moosdorf N (2012) Assessing the nonconservative fluvial fluxes of dissolved organic carbon in North America. J Geophys Res 117:G01027
Ledesma JLJ, Futter MN, Blackburn M, Lidman F, Grabs T, Sponseller RA, Laudon H, Bishop KH, Köhler SJ (2017) Towards an improved conceptualization of riparian zones in boreal forest headwaters. Ecosystems 21:1–19
Lee KY, van Geldern R, Barth JAC (2017) A high-resolution carbon balance in a small temperate catchment: insights from the Schwabach River, Germany. Appl Geochem 85:86–96
Leith FI, Dinsmore KJ, Wallin MB, Billett MF, Heal KV, Laudon H, Öquist MG, Bishop K (2015) Carbon dioxide transport across the hillslope-riparian-stream continuum in a boreal headwater catchment. Biogeosciences 12(6):1881–1892
Liang LL, Riveros-Iregui DA, Risk DA (2016) Spatial and seasonal variabilities of the stable carbon isotope composition of soil CO2 concentration and flux in complex terrain. J Geophys Res Biogeosci 121:2328–2339
Ludwig W, Probst J-L, Kempe S (1996) Predicting the oceanic input of organic carbon by continental erosion. Glob Biogeochem Cycles 10:23–41
Maréchal J-C, Braun J-J, Riotte J, Bedimo Bedimo J-P, Boeglin J-L (2011) Hydrologic processes of a rainforest headwater swamp from natural chemical tracing in Nsimi watershed, Cameroon. Hydrol Process 25:2246–2260
Marx AJ, Dusek J, Jankovec M, Sanda T, Vogel R, van Geldern J, Hartmann J, Barth JAC (2017) A review of CO2 and associated carbon dynamics in headwater streams: a global perspective. Rev Geophys 55:560–585
Maurizot P, Abessolo A, Feybesse JL, Johan V, Lecomte P (1986) Etude et Prospection Minière du Sud-Ouest Cameroun-Synthèse des Travaux de 1978 à 1985. BRGM, Direction des Activités Minières, Orléans
Mayorga E, Aufdenkampe AK, Masiello CA, Krusche AV, Hedges JI, Quay PD, Richey JE, Brown TA (2005) Young organic matter as a source of carbon dioxide outgassing from Amazonian rivers. Nature 436(7050):538–541
Miller JB, Tans PP (2003) Calculating isotopic fractionation from atmospheric measurements at various scales. Tellus B 55(2):207–214
Morel B, Durand P, Jaffezic A, Gruau G, Molénat J (2009) Sources of dissolved organic carbon during stormflow in a headwater agricultural catchment. Hydrol Process 23:2888–2901
Ndam JR (1997) Bilans hydrogéochimiques sous forêt tropicale humide en Afrique: du bassin expérimental de Nsimi-Zoétélé aux réseaux hydrographiques du Nyong et de la Sanaga au Sud-Cameroun. Ph.D. dissertation, University Pierre et Marie Curie Paris VI
Ndam Ngoupayou JR, Nkoue Ndondo GR, Boeglin JL, Braun JJ, Kamgang Kabeyene VB, Ekodeck GE (2005a) Water and fluxes of matter transfers during a storm event in the Mengong experimental watershed (Nsimi-South Cameroon). In: Heathwaite AL (ed) Dynamics and biogeochemistry of river corridors and wetlands, vol 294. IAHS Publications, Wallingford, pp 183–190
Ndam Ngoupayou JR, Boeglin J-L, Probst J-L, Braun J-J, Meybeck M, Nkoue Ndondo GR (2005b) The organic carbon dynamics of a small catchment in the humid tropics. In: Walling DE, Horowitz AJ (eds) Sediment budgets 1, vol 291. IAHS Publications, Foz do Iguaçu, pp 46–53
Nelson PN, Baldock JA, Oades JM (1993) Concentration and composition of dissolved organic carbon in streams in relation to catchment soil properties. Biogeochemistry 19:27–50
Ngao J, Cotrufo MF (2011) Carbon isotope discrimination during litter decomposition can be explained by selective use of substrate with differing δ13C. Biogeosci Discuss 8:51–82
Nier AO (1950) A redetermination of the relative abundances of the isotopes of carbon, nitrogen, oxygen, argon, and potassium. Phys Rev 77:789–793
Nkoue Ndondo G (2008) Le cycle du carbone en domaine tropical humide : exemple du bassin versant forestier du Nyong au sud Cameroun. Thesis (Ph.D.), University of Toulouse 3
Olivia P, Viers J, Dupré B, Fortune JP, Martin F, Braun JJ, Nahon D, Robain H (1999) The effect of organic matter on chemical weathering: study of a small tropical watershed: Nsimi-Zoetele site, Cameroon. Geochim Cosmochim Acta 63:4013–4035
Olivié-Lauquet G, Allard T, Benedetti M, Muller J-P (1999) Chemical distribution of trivalent iron in riverine material from a tropical ecosystem: a quantitative EPR study. Water Res 33:2726–2734
Olivié-Lauquet G, Allard T, Bertaux J, Muller JP (2000) Crystal-chemistry of suspended matter in a tropical hydrosystem: Nyong basin (Cameroon, Africa). Chem Geol 170:113–131
Opsahl SP, Zepp RG (2001) Photochemically-induced alteration of stable carbon isotope ratios (δ13C) in terrigeneous dissolved organic carbon. Geophys Res Lett 28(12):2417–2420
Öquist MG, Wallin M, Seibert J, Bishop K, Laudon H (2009) Dissolved inorganic carbon export across the soil/stream interface and its fate in a boreal headwater stream. Environ Sci Technol 43(19):7364–7369
Palmer SM, Hope D, Billett MF, Dawson JJC, Bryant CL (2001) Sources of organic and inorganic carbon in a headwater stream: evidence from carbon isotope studies. Biogeochemistry 52(3):321–338
Polsenaere P, Abril G (2012) Modelling CO2 degassing from small acidic rivers using water pCO2, DIC and δ13CDIC data. Geochim Cosmochim Acta 91:220–239
Porcal P, Dillon PJ, Molot LA (2015) Temperature dependence of photodegradation of dissolved organic matter to dissolved inorganic carbon and particulate organic carbon. PLoS One 10(6):e0128884
Powers JS, Schlesinger WH (2002) Geographic and vertical patterns of stable carbon isotopes in tropical rain forest soils of Costa Rica. Geoderma 109:141–160
Probst J-L, Mortatti J, Tardy Y (1994) Carbon river fluxes and weathering CO2 consumption in the Congo and Amazon river basins. Appl Geochem 9:1–13
Richey JE, Melack JM, Aufdenkampe AK, Ballester VM, Hess LL (2002) Outgassing from Amazonian rivers and wetlands as a large tropical source of atmospheric CO2. Nature 416:617–620
Sanderman J, Baldock JA, Amundson R (2008) Dissolved organic carbon chemistry and dynamics in contrasting forest and grassland soils. Biogeochemistry 89:181–198
Sanderman J, Lohse KA, Baldock JA, Amundson R (2009) Linking soils and streams: sources and chemistry of dissolved organic matter in a small coastal watershed. Water Resour Res 45(3):W03418
Shin WJ, Chung GS, Lee D, Lee KS (2011) Dissolved inorganic carbon export from carbonate and silicate catchments estimated from carbonate chemistry and δ13CDIC. Hydrol Earth Syst Sci 15:2551–2560
Strohmeier S, Knorr KH, Reichert M, Frei S, Fleckenstein JH, Peiffer S, Matzner E (2013) Concentrations and fluxes of dissolved organic carbon in runoff from a forested catchment: insights from high frequency measurements. Biogeosciences 10(2):905–916
Takam T, Arima M, Kokonyangi J, Dunkley DJ, Nsifa EN (2009) Paleoarchean charnockite in the Nten Complex, Congo Craton, Cameroon: insights from SHRIMP zircon U-Pd ages. J Miner Pet Sci 104:1–11
Telmer K, Veizer J (1999) Carbon fluxes, pCO2 and substrate weathering in a large northern river basin, Canada: carbon isotope perspectives. Chem Geol 159(1–4):61–86
Venkiteswaran JJ, Schiff SL, Wallin MB (2014) Large carbon dioxide fluxes from headwater boreal and sub-boreal streams. PloS One 9(7):e101756
Viers J, Dupré B, Polvé M, Schott J, Dandurand JL, Braun JJ (1997) Chemical weathering in the drainage basin of a tropical watershed (Nsimi-Zoetele site, Cameroon): comparison between organic poor and organic rich waters. Chem Geol 140:181–206
Viers J, Dupré B, Braun J-J, Deberdt S, Angeletti B, Ngoupayou JN, Michard A (2000) Major and trace element abundances and strontium isotopes in the Nyong basin rivers (Cameroon): constraints on chemical weathering processes and elements transport mechanisms in humid tropical environments. Chem Geol 169:211–241
Viers J, Dupré B, Braun JJ, Freydier R, Greenberg S, Ndam Ngoupayou JR, Sigha Nkamdjou L (2001) Evidence for nonconservative behavior of chlorine in humid tropical environments. Aquat Geochem 7:127–154
Wallin MB, Grabs T, Buffam I, Laudon H, Agren A, Oquist MG, Bishop K (2013) Evasion of CO2 from streams—the dominant component of the carbon export through the aquatic conduit in a boreal landscape. Glob Change Biol 19(3):785–797
Wang FS, Cao M, Wang BL, Fu JA, Luo WY, Ma J (2015) Seasonal variation of CO2 diffusion flux from a large subtropical reservoir in East China. Atmos Environ 103:129–137
Weiss RF (1974) Carbon dioxide in water and seawater: the solubility of non-ideal gas. Mar Chem 2:203–215
Wilson HF, Saiers JE, Raymond PA, Sobczak WV (2013) Hydrologic drivers and seasonality of dissolved organic carbon concentration, nitrogen content, bioavailability, and export in a forested New England stream. Ecosystems 16(4):604–616
Wynn JG, Bird MI (2007) C4-derived soil organic carbon decomposes faster than its C3 counterpart in mixed C3/C4 soils. Glob Change Biol 13(10):1–12
Wynn JG, Harden JW, Fries TL (2006) Stable carbon isotope depth profiles and soil organic carbon dynamics in lower Mississippi Basin. Geoderma 131:89–109
Zeebe RE, Wolf-Gladrow DA (2001) CO2 in seawater: equilibrium, kinetics, isotopes, vol 65. Gulf Professional Publishing, Houston
Zhang J (1995) Carbon isotope fractionation during gas–water exchange and dissolution of CO2. Geochim Cosmochim Acta 59(1):107–114
Zhong J, Li S-L, Ding H, Lang Y, Maberly SC, Xu S (2018) Mechanisms controlling dissolved CO2 over-saturation in the Three Gorges Reservoir area. Inland Waters 8(2):148–156
Acknowledgements
The long-term monitoring on Nsimi Small Environmental Watershed (NSEW), is supported by the project titled, Observatoire de Recherche en Environnement-Basins Versants Expérimentaux Tropicaux (ORE/BVET); http://bvet.omp.obs-mip.fr, where hydrological data and some geochemical data are available. We thank the team of the Nsimi Small Experimental Watershed (Nsimi SEW) and the Hydrological Research Centre (CRH) of Yaounde for setting up the NSEW and the Nyong hydrological network and for maintaining it. We also thank late Mathieu Zang and Mathurin Amougou of Nsimi village, Justin Nlozoa and late Jean Pierre Bedimo Bedimo of CRH for their help and especially for the support during the sampling phase. We thank Lagane Clarisse for assistance with the analytical work at the “Géoscience Environnement Toulouse (GET).” This work was supported by a grant from the Service de Coopération et d’Action Culturelle of the French Embassy (SCAC-Yaoundé).
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Nkoue Ndondo, G.R., Probst, JL., Ndjama, J. et al. Stable Carbon Isotopes δ13C as a Proxy for Characterizing Carbon Sources and Processes in a Small Tropical Headwater Catchment: Nsimi, Cameroon. Aquat Geochem 27, 1–30 (2021). https://doi.org/10.1007/s10498-020-09386-8
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DOI: https://doi.org/10.1007/s10498-020-09386-8