2026-05-10T08:07:02.170Z http://ezaposleni.singidunum.ac.rs/rest/sciNaucniRezultati/oai

ezaposleni.singidunum.ac.rs/rest/sciNaucniRezultati/oai:2:10255 2024-11-08T12:47:37Z 2

Holocene Stable Isotope (δ13C and δ15N) record of peatland development in Stavsåkra, southern Sweden 2024 http://ezaposleni.singidunum.ac.rs/rest/sciNaucniRezultati/oai/record/2/10255 https://www.sciencedirect.com/science/article/abs/pii/S0341816224007070?dgcid=author#ab010 S. Das A. Ekblad K. Stojanović A. Mikusinska M. Gaillard D. Mitrović Q. Cui Understanding the environmental and climate influence on the Holocene stable isotope record in peat is essential for applying the proxies in the paleoenvironmental reconstruction of lake and bog ecosystems. Here, we report total organic carbon (TOC), TOC to total nitrogen (N) ratio (C/N), and stable isotope ratios of organic carbon (δ13C) and nitrogen (δ15N) of bulk sediment and peat organic matter (OM) from a radiocarbon-dated core collected from Stavsåkra bog in southern Sweden. Changes in the TOC, C/N, δ13C and δ15N between 12 ka and 10.4 ka BP represent shifts in the OM source from aquatic primary producers to terrestrial swamp vegetation and pinpoint the transition of a highly productive water body into a reed swamp. The variation in δ13C values and increase in peat accumulation rate (AR) from 10.8 ka BP imply a rapid transition of the aquatic body into a peat-forming swamp and a shift from aquatic to atmospheric CO2 as the source of carbon (C) to the vegetation at the site. A sharp drop in N and δ15N in the reed swamp peat may indicate fixed-N in the soil as the source of N to the growing vegetation. Heavier δ13C and higher C/N ratio at the bottom of wood carr peat may reflect fire events. The rapid increase in peat AR between 7 ka and 6.5 ka BP suggests increased peat deposition under warmer and drier conditions. Lighter δ15N and δ13C, lower N, and TOC concentrations between 1.1 ka and 0.8 ka BP likely suggest warmer conditions related to the ‘Medieval Climate Anomaly’. The research demonstrates the successful application of stable C and N isotope ratios of bulk peat in palaeoenvironment and palaeoecological interpretations. article doi.org/10.1016/j.catena.2024.108510 247 108510 0341-8162 CATENA