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使稳定碳同位素在地表分离的作用主要是光合作用。大多数植物质与它借以发生光合作用的 CO_2相比,其(13)C 含量约低25‰,而少部份植物由于光合作用的生物化学方式不同而~(13)C 含量稍高,比 CO_2中的~(13)C 约少18‰。海洋有机物中的~(13)C 也比 CO_2中贫缺,其贫缺量仪稍低于一般陆上植物。通常,碳通过食物链的过程几乎不发生同位素分离。有人曾研究了温度对海洋浮游生物光合分离作用的影响,指
The role of stable carbon isotopes in the surface separation is mainly photosynthesis. Most plant matter has a low (13) C content of about 25 ‰ compared to the CO 2 by which photosynthesis takes place, whereas the content of (13) C is slightly higher in a few plants due to the different photosynthetic biochemical methods ~ (13) C in CO_2 is about 18 ‰ less. The ~ (13) C in marine organic matter is also less than that in CO_2, and the level of its deficiency and deficiency meter is slightly lower than that of general land-based plants. In general, almost no isotopic separation of carbon occurs through the food chain. Someone once studied the influence of temperature on the photosynthesis and separation of marine plankton, referring to it