NDLI: Sources of soil CO$_{2}$ in calcareous grassland with woody plant encroachment

Content Provider	Springer Nature Link
Author	Plestenjak, Gregor Eler, Klemen Vodnik, Dominik Ferlan, Mitja Čater, Matjaž Kanduč, Tjaša Simončič, Primož Ogrinc, Nives
Copyright Year	2012
Abstract	The objective of this study is to estimate the contribution of various sources that influence soil CO$_{2}$ concentrations in calcareous grassland.The research was performed at the Podgorski Kras plain (45 °33′ N, 13 °55′ E, 400–430 m.a.s.l.) in the sub-Mediterranean region of Slovenia (SW Slovenia), where many meadows and pastures have been abandoned. In parallel to the measurement of soil respiration R $_{s}$, soil gas was sampled for stable isotope analysis. Samples were taken biweekly at two sites, Grassland and Invaded, from July 2008 until November 2010. In addition, daily variations in concentration and stable isotope composition of soil CO$_{2}$ were determined in May 2009. The partitioning of soil CO$_{2}$ concentrations was performed using stable isotope mass balance calculation.The concentration and isotope composition of soil CO$_{2}$ exhibited similar seasonal variations at both sites. Lower δ$^{13}$C$_{CO2}$ values, ranging from −28.2 to −15.2 ‰, which occurred during warm periods and higher values, up to −12.1 ‰, were typical of cold winter periods, from December to March. Organic sources were estimated to constitute between 78 and 99 % of total soil CO$_{2}$ during warmer periods from May until October. This contribution was lower during the winter, ranging from 46 to 77 %. In winter, the atmospheric component to soil CO$_{2}$ dominated, constituting up to 60 %. On average, the inorganic contribution was estimated to comprise 12 % of the soil CO$_{2}$ at all sampling locations. The contribution of this source to soil CO$_{2}$ concentration, at up to 41 %, was highest in Grassland during the growing season. The inorganic source of soil CO$_{2}$ was also an important component during daily variations. The highest contribution was observed during the day, in parallel to the highest respiration rates.The inorganic pool is shown to be an important part of soil CO$_{2}$ in calcareous areas and should be considered as equal to organic CO$_{2}$ as a source in soil CO$_{2}$ partitioning.
Starting Page	1327
Ending Page	1338
Page Count	12
File Format	PDF
ISSN	14390108
Journal	Journal of Soils and Sediments
Volume Number	12
Issue Number	9
e-ISSN	16147480
Language	English
Publisher	Springer-Verlag
Publisher Date	2012-07-24
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Inorganic CO$_{2}$ Karst grassland Organic CO$_{2}$ Soil CO$_{2}$ Stable isotopes Soil Science & Conservation Environment Environmental Physics
Content Type	Text
Resource Type	Article
Subject	Stratigraphy Earth-Surface Processes

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
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3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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