瑞典南部斯塔夫索克拉全新世泥炭地发展的稳定同位素(δ13C 和 δ15N)记录

IF 5.4 1区 农林科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY Catena Pub Date : 2024-11-08 DOI:10.1016/j.catena.2024.108510
Supriyo Kumar Das , Alf Ekblad , Ksenija Stojanović , Anna Mikusinska , Marie-José Gaillard , Danica Mitrović , Qiao-Yu Cui
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引用次数: 0

摘要

了解环境和气候对泥炭中全新世稳定同位素记录的影响对于将代用指标应用于湖泊和沼泽生态系统的古环境重建至关重要。在此,我们报告了从瑞典南部 Stavsåkra 沼泽采集的放射性碳年代岩芯中的大量沉积物和泥炭有机质(OM)的总有机碳(TOC)、总有机碳与总氮(N)的比率(C/N)以及有机碳(δ13C)和氮(δ15N)的稳定同位素比率。公元前 12 ka 至 10.4 ka 期间 TOC、C/N、δ13C 和 δ15N 的变化代表了 OM 来源从水生初级生产者向陆生沼泽植被的转变,并准确地指出了高产水体向芦苇沼泽的过渡。从公元前 10.8 ka 开始,δ13C 值的变化和泥炭累积率(AR)的增加意味着水体迅速转变为泥炭形成的沼泽,以及该地点植被的碳(C)来源从水生二氧化碳转变为大气二氧化碳。芦苇沼泽泥炭中的氮和δ15N急剧下降,这可能表明土壤中的固定氮是植被生长的氮源。木腐泥炭底部较重的 δ13C 和较高的 C/N 比可能反映了火灾事件。公元前 7 ka 至 6.5 ka 之间泥炭 AR 的快速增长表明,在更温暖、更干燥的条件下泥炭沉积增加。公元前 1.1 ka 至 0.8 ka 之间较浅的 δ15N 和 δ13C、较低的 N 和 TOC 浓度可能表明与 "中世纪气候异常 "有关的较暖条件。该研究表明,在古环境和古生态解释中成功应用了大块泥炭的稳定碳和氮同位素比值。
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Holocene Stable Isotope (δ13C and δ15N) record of peatland development in Stavsåkra, southern Sweden
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.
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来源期刊
Catena
Catena 环境科学-地球科学综合
CiteScore
10.50
自引率
9.70%
发文量
816
审稿时长
54 days
期刊介绍: Catena publishes papers describing original field and laboratory investigations and reviews on geoecology and landscape evolution with emphasis on interdisciplinary aspects of soil science, hydrology and geomorphology. It aims to disseminate new knowledge and foster better understanding of the physical environment, of evolutionary sequences that have resulted in past and current landscapes, and of the natural processes that are likely to determine the fate of our terrestrial environment. Papers within any one of the above topics are welcome provided they are of sufficiently wide interest and relevance.
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