Sources and factors influencing lacustrine carbon burial over the last century: case study of Yinjia Lake, central China

IF 1.7 3区 地球科学 Q4 ENVIRONMENTAL SCIENCES Journal of Paleolimnology Pub Date : 2024-06-05 DOI:10.1007/s10933-024-00326-y
Changlin Zhan, Dejun Wan, Yongming Han, Shan Liu, Jiaquan Zhang, Hongxia Liu, Tianpeng Hu, Wensheng Xiao, Junji Cao
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Abstract

Lakes act as natural reservoirs for storing organic material, and comprehending how organic carbon (OC) and black carbon (BC) are deposited in lake sediments is crucial for understanding the global carbon cycle and its impact on climate and ecosystems. In this study, we examined changes in the deposition patterns of OC and BC in Yinjia Lake (YJL) over the past 110 years, using a 60 cm sediment core dated with 210Pb. Our aim was to discern how these changes relate to human activities and other influencing factors in the region of southeast Hubei, central China. Our findings revealed a consistent rise in total organic carbon (TOC) and total nitrogen (TN) concentrations, indicating a gradual increase from the bottom upwards. Analysis of C/N ratios and δ13C values showed that the OC in the sediment mainly originated from phytoplankton and terrestrial C3 plants. Over the past century, OC burial rates (OCBR) in the YJL core increased from 61.35 to 86.69 g m−2 yr−1, primarily due to increased primary production resulting from intensified local agriculture and urban growth. Temperature was found to influence OCBR, while precipitation had little impact on OCBR dynamics in sedimentary environments. BC burial rates in YJL ranged from 3.67 to 11.51 g m–2 yr–1, significantly exceeding those observed in other lakes worldwide. The fluctuations in BC burial rates correlated with shifts in local industrial practices and energy consumption. In recent years (post-2005), BC burial rates have declined, likely due to reduced pollutant emissions resulting from the implementation of emission-control policies in China. These results provide valuable insights into the interactions between human activities, climate variability, and carbon cycling in lacustrine environments, with implications for regional carbon budgets, ecosystem management, and climate-change mitigation strategies.

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上世纪湖底碳埋藏的来源及其影响因素:中国中部尹家湖案例研究
湖泊是储存有机物质的天然水库,了解有机碳(OC)和黑碳(BC)如何在湖泊沉积物中沉积对于理解全球碳循环及其对气候和生态系统的影响至关重要。在这项研究中,我们利用一个用 210Pb 测定年代的 60 厘米沉积物岩芯,考察了尹家湖(YJL)在过去 110 年中有机碳和黑碳沉积模式的变化。我们的目的是了解这些变化与中国中部湖北东南部地区的人类活动和其他影响因素之间的关系。我们的研究结果表明,总有机碳(TOC)和总氮(TN)浓度持续上升,表明从底部开始逐渐上升。C/N比和δ13C值分析表明,沉积物中的有机碳主要来源于浮游植物和陆生C3植物。在过去的一个世纪中,YJL岩芯中的OC埋藏率(OCBR)从61.35 g m-2 yr-1增加到86.69 g m-2yr-1,这主要是由于当地农业和城市的发展导致初级生产的增加。研究发现,温度会影响 OCBR,而降水对沉积环境中的 OCBR 动态影响不大。雅江湖中的萃取物埋藏率介于 3.67 至 11.51 g m-2 yr-1 之间,大大超过了在全球其他湖泊中观测到的埋藏率。BC 掩埋率的波动与当地工业实践和能源消耗的变化相关。近年来(2005 年以后),BC 埋藏率有所下降,这可能是由于中国实施了排放控制政策,减少了污染物的排放。这些结果为人类活动、气候变异和湖沼环境中碳循环之间的相互作用提供了宝贵的见解,对区域碳预算、生态系统管理和气候变化减缓战略具有重要意义。
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来源期刊
Journal of Paleolimnology
Journal of Paleolimnology 地学-地球科学综合
CiteScore
3.70
自引率
9.50%
发文量
44
审稿时长
3 months
期刊介绍: The realization that a historical perspective is often useful, if not essential, to the understanding of most limnological processes has resulted in the recent surge of interest in paleolimnology. The main aim of the Journal of Paleolimnology is the provision of a vehicle for the rapid dissemination of original scientific work dealing with the reconstruction of lake histories. Although the majority of papers deal with lakes, paleoenvironmental studies of river, wetland, peatland and estuary systems are also eligible for publication. The Journal of Paleolimnology, like the subject itself, is multidisciplinary in nature, and papers are published that are concerned with all aspects (e.g. biological, chemical, physical, geological, etc.) of the reconstruction and interpretation of lake histories. Both applied and more theoretical papers are equally encouraged. The Journal of Paleolimnology will continue to be a major repository for papers dealing with climatic change, as well as other pressing topics, such as global environmental change, lake acidification, eutrophication, long-term monitoring, and other aspects of lake ontogeny. Taxonomic and methodological papers are also acceptable provided they are of relatively broad interest. New equipment designs are frequently featured. In addition to original data and ideas, the Journal of Paleolimnology also publishes review articles, commentaries and program announcements. A relevant Book Review Section is also featured.
期刊最新文献
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