Assertion: sediment's level | /r/HasProperty | zhang et al
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text: The pore water FDOM sources in Lake Qinghai could also be understood evidently from the stable carbon isotope (δ13C org ) of organic carbon, which fluctuates largely, showing the lowest level (− 28.6‰) and the highest level (− 25.0‰) at 47–48 cm (Zhang et al. 2002).