{"title":"Sources and factors influencing lacustrine carbon burial over the last century: case study of Yinjia Lake, central China","authors":"Changlin Zhan, Dejun Wan, Yongming Han, Shan Liu, Jiaquan Zhang, Hongxia Liu, Tianpeng Hu, Wensheng Xiao, Junji Cao","doi":"10.1007/s10933-024-00326-y","DOIUrl":null,"url":null,"abstract":"<p>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 <sup>210</sup>Pb. 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 δ<sup>13</sup>C 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<sup>−2</sup> yr<sup>−1</sup>, 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<sup>–2</sup> yr<sup>–1</sup>, 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.</p>","PeriodicalId":16658,"journal":{"name":"Journal of Paleolimnology","volume":"36 1","pages":""},"PeriodicalIF":1.7000,"publicationDate":"2024-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Paleolimnology","FirstCategoryId":"89","ListUrlMain":"https://doi.org/10.1007/s10933-024-00326-y","RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"ENVIRONMENTAL SCIENCES","Score":null,"Total":0}
引用次数: 0
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.
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.