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Practical evaluation of carbon sources of forest soils in Slovenia from stable and radio-carbon isotope measurements |
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| Authors: | Ryoko Fujiyoshi Hikaru Amano Yousuke Sakuta Kazumasa Okamoto Takashi Sumiyoshi Ivan Kobal Janja Vaupoti? |
| Institution: | 1. School of Engineering, Hokkaido University, Sapporo, 060-8628, Hokkaido, Japan 2. Japan Chemical Analysis Center, Inage-ku, Chiba, 263-0002, Chiba, Japan 3. Department of Environmental Sciences, Jo?ef Stefan Institute, Jamova cesta 39, 1000, Ljubljana, Slovenia |
| Abstract: | Carbon sources were estimated by measuring carbon isotope ratios (??13C and ??14C) with accelerator mass spectrometry (AMS) in forest soils of different lithology. Six locations were selected in temperate deciduous and coniferous stands in Slovenia (?irovski vrh, Idrija, Ko?evski Rog, Pohorje, Gori?nica, and Rakitna), where carbonate rocks consisting of limestone and dolomite are abundant as underlying bedrock. Carbon isotope fractionation would not have occurred in two carbonaceous soils, since the values of both ??13C and ??14C changed consistently in these soils after thermal (550°C, 2?h) or chemical (1?M HCl, 24?h) treatments. Organic components were found to be predominant carbon sources (70?C100%) in the uppermost portions (0?C2?cm in depth). In deeper portions at a depth of about 30?C35?cm, soil carbon may be derived completely from underlying carbonate minerals in Idria, western part of Slovenia. The Combination of heat and chemical treatments with AMS provides practical information on soil carbon sources in carbonaceous soils. |
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