ABSTRACT

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 a¹⁴C_moss and δ ¹³C_moss 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 $({\omega }_{\mathrm{atm}.\mathrm{C}})$ and carbon fractionation factor from aquatic CO₂ (DIC) to moss tissue $({\epsilon }_{\mathrm{moss}/\mathrm{g}-\mathrm{aq}})$ 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 ${\epsilon }_{\mathrm{moss}/\mathrm{g}-\mathrm{aq}}\text{vs}.{\omega }_{\mathrm{atm}.\mathrm{C}}$ differentiates true aquatic and amphiphyte mosses. The first had a statistically significant negative correlation between ${\epsilon }_{\mathrm{moss}/\mathrm{g}-\mathrm{aq}}$ and ${\omega }_{\mathrm{atm}.\mathrm{C}}$. The amphiphyte mosses had lower ${\epsilon }_{\mathrm{moss}/\mathrm{g}-\mathrm{aq}}$ with higher water flow rates.

摘要

放射性碳活性（一¹⁴ ℃）和¹³ Ç组合物（δ ¹³ C）在湿生和生植物（地）分别测定苔藓收集在十六湖的自然栖息地并沿兹尔马尼亚河和克鲁帕河（典型的大陆和地中海气候， ）， 克罗地亚。一个¹⁴ C和δ ^13个苔藓的C值大气CO的，₂和溶解的无机碳（DIC）与当代数据和与在十六湖从30年前的数据进行比较时，¹⁴大气CO的C活性₂为约30％更高。一个之间的正相关性¹⁴ Ç_苔和δ ^13个Ç_苔观察到的所有数据反映碳同位素组成在DIC沿水流动并在大气CO的变化₂不管气候区域和历史时期的。苔藓中大气碳的分数$（{\omega }_{\mathrm{自动取款机}。\mathrm{C}}）$CO ₂（DIC）到苔藓组织的碳和碳分馏因子$（{\epsilon }_{\mathrm{苔藓}/\mathrm{G}-\mathrm{水}}）$为每个单独的苔藓计算。三种苔藓的有ω _atm.C  〜0％，这意味着他们在旱季转向复苏。关系${\epsilon }_{\mathrm{苔藓}/\mathrm{G}-\mathrm{水}}\text{与}。{\omega }_{\mathrm{自动取款机}。\mathrm{C}}$区分真正的水生和两栖类苔藓。第一个在统计上与${\epsilon }_{\mathrm{苔藓}/\mathrm{G}-\mathrm{水}}$ 和 ${\omega }_{\mathrm{自动取款机}。\mathrm{C}}$。两栖植物的苔藓较低${\epsilon }_{\mathrm{苔藓}/\mathrm{G}-\mathrm{水}}$ 水流量更高。