Decadal trends of black carbon and heavy metal accumulation in a lake sediment core from central China: A historical perspective

IF 5.4 1区农林科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY

Catena Pub Date : 2024-11-06 DOI:10.1016/j.catena.2024.108513

Changlin Zhan , Dejun Wan , Yongming Han , Jiaquan Zhang , Shan Liu , Hongxia Liu , Tianpeng Hu , Wensheng Xiao , Junji Cao , Dong Li

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Abstract

Black carbon (BC) and heavy metal are vital indicators of historical human activities. This study investigates the historical pollution trends of BC, char, soot, and heavy metals in lake sediments from Yinjia Lake (YJL). BC, char, and soot concentrations exhibit similar historical trends, with average values of 1.59, 1.27, and 0.32 mg/g, respectively. Char, constituting 67.25–85.85 % of BC, indicates a dominant fraction in the lake. A notable increase in BC, char, and soot was observed post-1955, peaking in 2005, followed by a decline, reflecting local economic development and anthropogenic activities. Heavy metals, including Cu, Cd, Zn, Pb, Cr, Co, Ni, and Mn, also displayed a significant increase post-1950, with Cd showing an exceptionally high concentration. The average deposition fluxes of BC, char, and soot were consistent with their concentrations, peaking in 2005. The correlations between BC, char, soot, and heavy metals suggest BC’s role as a metal carrier, influenced by industrial and anthropogenic emissions. The char/soot ratio analysis indicates predominant biomass burning pre-1950 and increased fossil fuel combustion post-1950, with regional variations observed. The study highlights the impact of industrialization, urbanization, and policy changes on pollution trends in YJL.

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中国中部湖泊沉积物岩芯中黑碳和重金属累积的十年趋势：历史视角

黑碳（BC）和重金属是人类历史活动的重要指标。本研究调查了尹家湖湖泊沉积物中黑碳、炭黑、烟尘和重金属的历史污染趋势。萃取物、炭和烟尘的浓度呈现出相似的历史趋势，平均值分别为 1.59、1.27 和 0.32 mg/g。木炭占 BC 的 67.25-85.85%，是湖中的主要成分。据观测，1955 年后 BC、焦炭和烟尘显著增加，2005 年达到峰值，随后出现下降，这反映了当地的经济发展和人为活动。重金属（包括铜、镉、锌、铅、铬、钴、镍和锰）在 1950 年后也有显著增加，其中镉的浓度特别高。BC、焦炭和烟尘的平均沉积通量与其浓度一致，在 2005 年达到峰值。BC、焦炭、烟尘和重金属之间的相关性表明，受工业和人为排放的影响，BC 扮演着金属载体的角色。焦炭/烟尘比率分析表明，1950 年前生物质燃烧占主导地位，1950 年后化石燃料燃烧增加，并观察到区域差异。该研究强调了工业化、城市化和政策变化对雅江县污染趋势的影响。

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来源期刊

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.