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Photosynthetic pathway of steppe vegetation and the stable carbon isotope composition of organic matter in the Russian Chernozem

Communications in Soil Science and Plant Analysis, ISSN: 0010-3624, Vol: 39, Issue: 5-6, Page: 641-651
2008
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This study was conducted to determine the stable carbon isotope composition of soil organic carbon (C) under different land uses in the Russian Chernozem, one of the typical soils in grasslands. Three sites were sampled: a native grassland field (not cultivated for at least 300 years), an adjacent 50-year continuous fallow field in the V. V. Alekhin Central Chernozem Biosphere State Reserve in the Kursk region of Russia, and a continuously cropped field in the Experimental Station of the Kursk Institute of Agronomy and Soil Erosion Control. All sampled soils were classified as Haplic Chernozem. The stable C isotope composition of organic C (δ13C values vary from -24.7‰ to -25.9‰) is determined by the C3-type plants dominating in the region. Agricultural crops grown in the region are predominantly C3-type with the exception of corn. Corn cropping slightly altered the stable C isotope signature of soil organic C. Presence of carbonates in the soil can interfere with the stable C isotope signature of soil organic C at depth. It can result in high variability of the stable C isotope signature of organic C where carbonates are present, and therefore caution should be applied when using these values for determination of the proportion of C3/C4-type plants contributing to soil organic-matter formation. Copyright © Taylor & Francis Group, LLC.

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