Dipartimento di Scienze Ambientali, Università Ca' Foscari, Dorsoduro 2137, 30123 Venezia, Italy.
Sci Total Environ. 2010 Apr 15;408(10):2226-32. doi: 10.1016/j.scitotenv.2010.01.060. Epub 2010 Feb 26.
The biogeochemical processes affecting the transport and cycling of terrestrial organic carbon in coastal and transition areas are still not fully understood. One means of distinguishing between the sources of organic materials contributing to particulate organic matter (POM) in Babitonga Bay waters and sediments is by the direct measurement of delta(13)C of dissolved inorganic carbon (DIC) and delta(13)C and delta(15)N in the organic constituents. An isotopic survey was taken from samples collected in the Bay in late spring of 2004. The results indicate that the delta(13)C and delta(15)N compositions of OM varied from -21.7 per thousand to -26.2 per thousand and from +9.2 per thousand to -0.1 per thousand, respectively. delta(13)C from DIC ranges from +0.04 per thousand to -12.7 per thousand. The difference in the isotope compositions enables the determination of three distinct end-members: terrestrial, marine and urban. Moreover, the evaluation of source contribution to the particulate organic matter (POM) in the Bay, enables assessment of the anthropogenic impact. Comparing the depleted values of delta(13)C(DIC) and delta(13)C(POC) it is possible to further understand the carbon dynamic within Babitonga Bay.
影响陆地有机碳在沿海和过渡区输运和循环的生物地球化学过程仍未被完全理解。区分导致巴比托纳湾水和沉积物中颗粒有机物质（POM）的有机物质来源的一种方法是直接测量溶解无机碳（DIC）的δ¹³C 和有机成分的δ¹³C 和 δ¹⁵N。2004 年春末，对从该湾采集的样本进行了同位素调查。结果表明，OM 的 δ¹³C 和 δ¹⁵N 组成分别在-21.7‰至-26.2‰和+9.2‰至-0.1‰之间变化。DIC 的 δ¹³C 范围在+0.04‰至-12.7‰之间。同位素组成的差异可以确定三个不同的端元：陆地、海洋和城市。此外，对海湾中颗粒有机物质（POM）的来源贡献进行评估，可以评估人为影响。比较 δ¹³C(DIC)和 δ¹³C(POC)的消耗值，可以进一步了解巴比托纳湾内的碳动态。
