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Journal of Soils and Sediments

, Volume 17, Issue 7, pp 1883–1892 | Cite as

Soil CO2 sources above a subterranean cave—Pisani rov (Postojna Cave, Slovenia)

  • Bor Krajnc
  • Mitja Ferlan
  • Nives Ogrinc
ISEB 2015: Biogeochemical Dynamics of Sediment-Water Systems: Processes and Modelling

Abstract

Purpose

The objective of this research is to detect abiotic sources of soil CO2 above a subterranean cave in the Slovenian karst region.

Materials and methods

The research was performed in the forest above Pisani rov (Postojna Cave) near the town of Postojna (SW Slovenia) and also in the cave. Soil gas, atmospheric air and cave air carbon stable isotope composition (δ13CCO2) and CO2 concentration were measured. Sampling and measurements were performed bi-monthly at the test and control sites above the cave. The abiotic source of soil CO2 was estimated using a stable isotope mass balance calculation.

Results and discussion

Similar seasonal patterns of soil CO2 and δ13CCO2 values were observed at both the test and control sites until spring, with higher levels of CO2 observed in summer and lower in winter. The δ13CCO2 showed the opposite trend, i.e. lower values (−26 to −20 ‰) in summer and higher values (up to −17 ‰) in winter and early spring. In spring, the soil CO2 concentration decreases and the δ13CCO2 value increases only at the control site. A time series of a modelled “isotopically light” endmember revealed large shifts in the data values, due to the presence of an abiotic CO2 source. Results suggest that the subterranean CO2 pool and its ventilation is the main source of soil CO2, accounting for up to 80 % of the soil gas during cold periods.

Conclusions

Ventilation from subterranean cavities is an important source of soil CO2 in karstic areas and should be taken into account during carbon cycling studies.

Keywords

Abiotic sources Karst region Soil CO2 Stable isotopes Ventilation 

Notes

Acknowledgments

The study is a part of the PhD thesis of B. Krajnc supported by the Innovative scheme for co-financing of doctoral studies financed by the European Union through the European Social Fund and by the scholarship granted by the World Federation of Scientists. We are grateful to Iztok J. Košir from the Slovenian Institute for Hop Research and Brewing for the pedologic analyses and the Farmland and Forest Fund of the Republic of Slovenia for the permission to do research in the forest. We would also like to thank the Regional Forest Service Postojna of the Slovenian Forest Service and Maksimilijan Gorup for providing information regarding sanitation forest cutting. We appreciate the support of cave guides Stanislav Glažar, Janez Margon and Erik Rebec for their dedication during fieldwork. We would also like to acknowledge the managers of Postojna Jama d.d. and Ministry of Agriculture and Environment of Slovenia for the permission to access and work in the cave.

References

  1. Amundson R (2001) The carbon budget in soils. Annu Rev Earth Pl Sc 1:535–562CrossRefGoogle Scholar
  2. ARSO (2015) ARSO. Available from: http://www.arso.gov.siGoogle Scholar
  3. Barnet I, Neznal M, Neznal M, Pacherová P (2008) Radon in geological environment—Czech experience. Czech Geological Survey, PragueGoogle Scholar
  4. Čater M, Ogrinc N (2011) Soil respiration rates and δ13CCO2 in natural beech forest (Fagus sylvatica L.) in relation to stand structure. Isot Environ Healt S 47:221–237Google Scholar
  5. Cerling TE, Quade J (1993) Stable carbon and oxygen isotopes in soil carbonates. Climate change in continental isotopic records pp:217–231Google Scholar
  6. Cerling TE, Solomon DK, Quade J, Bowman JR (1991) On the isotopic composition of carbon in soil carbon dioxide. Geochim Cosmochim Acta 11:3403–3405CrossRefGoogle Scholar
  7. Cook FJ, Orchard VA (2008) Relationships between soil respiration and soil moisture. Soil Biol Biochem 5:1013–1018CrossRefGoogle Scholar
  8. Cuezva S, Fernandez-Cortes A, Benavente D, Serrano-Ortiz P, Kowalski AS, Sanchez-Moral S (2011) Short-term CO2(g) exchange between a shallow karstic cavity and the external atmosphere during summer: role of the surface soil layer. Atmos Environ 7:1418–1427Google Scholar
  9. Davidson EA, Verchot LV, Cattânio JH, Ackerman IL, Carvalho J (2000) Effects of soil water content on soil respiration in forests and cattle pastures of eastern Amazonia. Biogeochemistry 1:53–69CrossRefGoogle Scholar
  10. Davidson GR (1995) The stable isotopic composition and measurement of carbon in soil CO2. Geochimica et Cosmochimica Acta 59(12):2485–2489Google Scholar
  11. Doerr H, Münnich KO (1986) Annual variations of the 14C content of soil CO2. Radiocarbon 2A:338–345Google Scholar
  12. Domínguez-Villar D, Lojen S, Krklec K, Baker A, Fairchild IJ (2015) Is global warming affecting cave temperatures? Experimental and model data from a paradigmatic case study. Clim Dyn 3-4:569–581CrossRefGoogle Scholar
  13. Doran JW, Mielke LN, Power JF (eds) (1990) Microbial activity as regulated by soil water-filled pore space. Transactions 14th International Congress of Soil Science. Symposium III-3; Ecology of soil microorganisms in microhabital environments. Kyoto, Japan, pp 94–99Google Scholar
  14. GLOBALVIEW-CO2C13 (2009) GLOBALVIEW-CO2C13: cooperative atmospheric data integration project—δ13C of carbon dioxide. Available from: http://www.esrl.noaa.gov/gmd/ccgg/globalview/co2c13/co2c13_intro.html
  15. Gregorič A, Vaupotič J, Gabrovšek F (2013) Reasons for large fluctuation of radon and CO2 levels in a dead-end passage of a karst cave (Postojna Cave, Slovenia). Nat Hazards Earth Syst Sci 2:287–297CrossRefGoogle Scholar
  16. Guntiñas ME, Gil-Sotres F, Leirós MC, Trasar-Cepeda C (2013) Sensitivity of soil respiration to moisture and temperature. J Soil Sci Plant Nutr 2:445–461Google Scholar
  17. Hartman G, Danin A (2010) Isotopic values of plants in relation to water availability in the eastern Mediterranean region. Oecologia 4:837–852CrossRefGoogle Scholar
  18. ISO 11464 (2006) Soil quality—pretreatment of samples for physio-chemical analysis. ISO, GenevaGoogle Scholar
  19. Jin L, Ogrinc N, Hamilton SK, Szramek K, Kanduč T, Walter LM (2009) Inorganic carbon isotope systematics in soil profiles undergoing silicate and carbonate weathering (southern Michigan, USA). Chem Geol 1:139–153Google Scholar
  20. Knohl A, Werner RA, Geilmann H, Brand WA (2004) Kel-F discs improve storage time of canopy air samples in 10-mL vials for CO213C analysis. Rapid Commun Mass Spectrom 14:1663–1665Google Scholar
  21. Kowalski AS, Serrano-Ortiz P, Janssens IA, Sánchez-Moral S, Cuezva S, Domingo F, Were A, Alados-Arboledas L (2008) Can flux tower research neglect geochemical CO2 exchange? Agric For Meteorol 6–7:1045–1054Google Scholar
  22. Kuzyakov Y (2006) Sources of CO2 efflux from soil and review of partitioning methods. Soil Biol Biochem 3:425–448Google Scholar
  23. Linn DM, Doran JW (1984) Effect of water-filled pore space on carbon dioxide and nitrous oxide production in tilled and nontilled soils. Soil Sci Soc Am J 6:1267–1272CrossRefGoogle Scholar
  24. Meyer KW, Feng W, Breecker DO, Banner JL, Guilfoyle A (2014) Interpretation of speleothem calcite δ13C variations: evidence from monitoring soil CO2, drip water, and modern speleothem calcite in Central Texas. Geochim Cosmochim Acta 142:281–298CrossRefGoogle Scholar
  25. Plestenjak G, Eler K, Vodnik D, Ferlan M, Čater M, Kanduč T, Simončič P, Ogrinc N (2012) Sources of soil CO2 in calcareous grassland with woody plant encroachment. J Soils Sediments 9:1327–1338Google Scholar
  26. Raich JW, Potter CS (1995) Global patterns of carbon dioxide emissions from soils. Global Biogeochem Cy 1:23–36CrossRefGoogle Scholar
  27. Raich JW, Schlesinger WH (1992) The global carbon dioxide flux in soil respiration and its relationship to vegetation and climate. Tellus B 2:81–99CrossRefGoogle Scholar
  28. Raich JW, Potter CS, Bhagawati D (2002) Interannual variability in global soil respiration, 1980–94. Glob Change Biol 8:800–812CrossRefGoogle Scholar
  29. Salomons W, Mook WG (1986) Isotope geochemistry of carbonates in the weathering zone. handbook of environmental isotope geochemistry. Elsevier, Amsterdam, pp. 239–269Google Scholar
  30. Schindlbacher A, Borken W, Djukic I, Brandstätter C, Spötl C, Wanek W (2015) Contribution of carbonate weathering to the CO2 efflux from temperate forest soils. Biogeochemistry 1-3:273–290Google Scholar
  31. Šebela S (2010) Accesses from the surface to the Postojna Cave system. Annales Series historia naturalis 1:55–64Google Scholar
  32. Šebela S, Čar J (2000) Velika Jeršanova doline—a former collapse doline: Velika Jeršanova dolina—nekdanja udornica. Acta carsologica 2:201–212Google Scholar
  33. Serrano-Ortiz P, Roland M, Sanchez-Moral S, Janssens IA, Domingo F, Godderis Y, Kowalski AS (2010) Hidden, abiotic CO2 flows and gaseous reservoirs in the terrestrial carbon cycle: review and perspectives. Agric For Meteorol 3:321–329Google Scholar
  34. Spötl C (2004) A simple method of soil gas stable carbon isotope analysis. Rapid Commun Mass Spectrom 11:1239–1242CrossRefGoogle Scholar
  35. Spötl C, Fairchild IJ, Tooth AF (2005) Cave air control on dripwater geochemistry, Obir caves (Austria): implications for speleothem deposition in dynamically ventilated caves. Geochim Cosmochim Acta 10:2451–2468CrossRefGoogle Scholar
  36. Tiedje JM, Sexstone AJ, Parkin TB, Revsbech NP (1984) Anaerobic processes in soil. Plant Soil 1-3:197–212CrossRefGoogle Scholar
  37. Zhang J, Quay PD, Wilbur DO (1995) Carbon isotope fractionation during gas-water exchange and dissolution of CO2. Geochim Cosmochim Acta 1:107–114Google Scholar

Copyright information

© Springer-Verlag Berlin Heidelberg 2016

Authors and Affiliations

  1. 1.Jožef Stefan International Postgraduate SchoolLjubljanaSlovenia
  2. 2.Department of Environmental SciencesJožef Stefan InstituteLjubljanaSlovenia
  3. 3.Slovenian Forestry InstituteLjubljanaSlovenia

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