Young, Old, and Weathered Carbon-Part 1: Using Radiocarbon and Stable Isotopes to Identify Carbon Sources in an Alkaline, Humic Lake
Young, Old, and Weathered Carbon-Part 1: Using Radiocarbon and Stable Isotopes to Identify Carbon Sources in an Alkaline, Humic Lake
复制标题
DOI：
10.2458/azu_rc.57.18354
复制
发表时间：
2015-04
期刊：
影响因子：
8.3
通讯作者：
E. Keaveney;P. Reimer;R. Foy
中科院分区：
文献类型：
--
作者：
E. Keaveney;P. Reimer;R. Foy
本文以爱尔兰西北部的一个腐殖质碱性湖泊Lower Lough Erne为例，利用放射性碳法确定碳的来源和年龄，以确定陆地碳是被异养生物利用还是埋藏在沉积物中。采用阶梯燃烧法估算地表沉积物中陆源碳的埋藏程度。测定了浮游植物、溶解无机碳（DIC）、溶解有机碳（DOC）和颗粒有机碳（POC）的δ13C和δ15N值Δ14C、δ13C和δ15N值。Δ14C值被用来表示不同碳源的存在，包括基岩衍生的无机碳、“现代”、“近期”、“地下”和“亚化石”陆源碳。14c的使用与新方法（如阶梯燃烧）相结合，可以确定系统中陆地碳的途径，这对区域和全球碳循环具有重要意义。
This article presents a case study of Lower Lough Erne, a humic, alkaline lake in northwest Ireland, and uses the radiocarbon method to determine the source and age of carbon to establish whether terrestrial carbon is utilized by heterotrophic organisms or buried in sediment. Stepped combustion was used to estimate the degree of the burial of terrestrial carbon in surface sediment. Δ14C, δ13C, and δ15N values were measured for phytoplankton, dissolved inorganic carbon (DIC), dissolved organic carbon (DOC), and particulate organic carbon (POC). Δ14C values were used to indicate the presence of different sources of carbon, including bedrock-derived inorganic carbon, “modern,” “recent,” “subsurface,” and “subfossil” terrestrial carbon in the lake. The use of 14 C in conjunction with novel methods (e.g. stepped combustion) allows the determination of the pathway of terrestrial carbon in the system, which has implications for regional and global carbon cycling.