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Copyright © 2014 by The Geochemical Society of Japan. 2001; Smith et al., 1998). DOC is operationally defined as the organic matter fraction in solution that passes a 0.45 μm filter. It comprises only a small part of soil organic matter, but it affects many processes in soil and water, including the most serious environmental problems such as soil and water pollution, as well as global warming (Kalbitz and Kaiser, 2003; Bolan et al., 2004). Many studies have shown that DOC is a crucial environmental indicator for research on the carbon cycle and the environment (Don and Kalbitz, 2005; McDowell et al., 2006). During the last 30 years, land use and land cover changes have markedly increased DOC concentrations in UK rivers (Yallop and Clutterbuck, 2009). In short, determining the retention and turnover of DOC at global and regional scales is useful for characterizing and quantifying the C storage capacity of soils. Stable carbon isotopes are a powerful tool for assessing the origin and dynamics of carbon in soils. Terrestrial plants can be divided into C3, C4, and CAM plants according to their photosynthetic pathways. C3 plants have δ13C values ranging from –20‰ to –35‰ (mean ca. –27‰), while C4 plants have δ13C values ranging between –9‰ and –17‰ (mean ca. –13‰). CAM plants use both C3 and C4 photosynthetic pathways, having δ13C values between those of C3 and C4 plants (O’Leary, 1988; Farquhar et al., 1989). Soil organic matter (SOM) has a Dissolved organic carbon and its carbon isotope compositions in hill slope soils of the karst area of southwest China: Implications for carbon dynamics in limestone soil

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Dissolved organic carbon and its carbon isotope compositions in hill slope soils of the karst area of southwest China: Implications for carbon dynamics in limestone soil