Radiocarbon activity (a14C) and 13C composition (δ 13C) were measured in hygrophyte and mesophyte (land) mosses collected in the natural habitat of the Plitvice Lakes and along the Zrmanja and Krupa Rivers (typical continental and Mediterranean climates, respectively), Croatia. a14C and δ 13C values of mosses, of atmospheric CO2 and dissolved inorganic carbon (DIC) were compared with contemporary data and with data from 30 years ago at the Plitvice Lakes when 14C activity of atmospheric CO2 was ∼30% higher. A positive correlation between a14Cmoss and δ 13Cmoss was observed for all data reflecting the change of carbon isotopic composition in DIC along the water flows and in atmospheric CO2 regardless of the climatic regions and historic period. Fraction of the atmospheric carbon in moss ( ω atm . C ) and carbon fractionation factor from aquatic CO2 (DIC) to moss tissue ( ε moss / g - aq ) were calculated for each individual moss. Three species of mosses had ω atm.C ∼ 0 % implying that they turn to anabiosis during dry periods. The relation ε moss / g - aq vs . ω atm . C differentiates true aquatic and amphiphyte mosses. The first had a statistically significant negative correlation between ε moss / g - aq and ω atm . C . The amphiphyte mosses had lower ε moss / g - aq with higher water flow rates.

中文翻译：

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喀斯特水生苔藓中碳同位素分馏

放射性碳活性 (a14C) 和 13C 组成 (δ13C) 在克罗地亚十六湖的自然栖息地以及 Zrmanja 河和克鲁帕河（分别是典型的大陆性和地中海气候）收集的潮湿植物和中植物（陆地）苔藓中测量。将苔藓、大气 CO2 和溶解无机碳 (DIC) 的 a14C 和 δ13C 值与当代数据和 30 年前在十六湖的数据进行了比较，当时大气 CO2 的 14C 活动高出约 30%。无论气候区域和历史时期如何，所有反映 DIC 中沿水流和大气 CO2 中碳同位素组成变化的数据都观察到 a14Cmoss 和 δ 13Cmoss 之间的正相关。苔藓中大气碳的比例 (ω atm . C ) 和从水生 CO2 (DIC) 到苔藓组织的碳分馏因子 (ε moss / g - aq ) 被计算为每个单独的苔藓。三种苔藓具有 ω atm.C ∼ 0 %，这意味着它们在干旱时期转向复苏。关系 ε moss / g-aq vs . ω atm 。C 区分真正的水生苔藓和两栖苔藓。第一个在 ε moss / g-aq 和 ω atm 之间具有统计上显着的负相关。C 。两栖类苔藓具有较低的 ε moss / g - aq 和较高的水流量。第一个在 ε moss / g-aq 和 ω atm 之间具有统计上显着的负相关。C 。两栖类苔藓具有较低的 ε moss / g - aq 和较高的水流量。第一个在 ε moss / g-aq 和 ω atm 之间具有统计上显着的负相关。C 。两栖类苔藓具有较低的 ε moss / g - aq 和较高的水流量。