研究气候因素和人类活动对湖泊中重金属(HM)污染沉积记录的影响对于全球环境监测和评估的决策至关重要。晶粒尺寸(GS)和HM的时空分布(Al,Cr,Mn,Ni,Cu,Zn,As,和Pb)浓度已在来自中国西南部两个相邻的高原断层湖泊的核心沉积物中进行了测定,即,富县深贫营养湖(FX)和星云浅水肥厚湖(XY)。结果表明,FX(4.61μm)的d50平均值低于XY(8.35μm),但XY中HMs(除Cr和Mn外)的平均浓度高于FX。重金属埋藏率(HMBR)主要受沉积物积累率(SARs)而不是HM浓度控制。随着水深的增加与稳定的沉积环境有关,GS和HM浓度之间的相关系数变得很强。FX和XY之间HMs的时间积分富集因子(EF)和来源鉴定代表Cr,Ni,铜来自天然来源,但锰,Zn,As,和来自人为来源的铅,分别。无论FX和XY,HMs从自然来源到人为来源的过渡时间发生在1960年代中期。通过偏最小二乘路径模型(PLS-PM)比较气候因子和人为因素对人为HMBR增加的资格影响暗示社会经济活动,如人口密度(PD)和国内生产总值(GDP),XY(0.23/0.71)比FX(0.11/0.18)提供了更高的人为HMBR增加的贡献者。这项研究的比较结果为具有对比环境的邻近湖泊的环境监测和HM污染管理提供了新的见解。
Investigating the impacts of climatic factors and human activities on sedimentary records of heavy metal (HM) contamination in lakes is essential for decision-making in global environmental monitoring and assessment. Spatiotemporal distributions of grain size (GS) and HM (Al, Cr, Mn, Ni, Cu, Zn, As, and Pb) concentrations have been conducted in core sediments that are collected from two adjacent plateau fault-bound lakes in southwest
China with contrasting environments, i.e., deep oligotrophic Lake Fuxian (FX) and shallow hypertrophic Lake Xingyun (XY). Results showed that the average value of d50 in FX (4.61 μm) was lower than that in XY (8.35 μm), but the average concentrations of HMs (except Cr and Mn) in XY were higher than those in FX. Heavy metal
burial rates (HMBR) were mainly controlled by sediment accumulation rates (SARs) rather than HM concentrations. The correlation coefficients between GS and HM concentrations became strong as the increasing water depths were associated with a stable sedimentary environment. Time-integrated enrichment factors (EF) and source identification of HMs between FX and XY represented that Cr, Ni, and Cu originated from natural sources but Mn, Zn, As, and Pb from anthropogenic sources, respectively. Regardless of FX and XY, the transition times of HMs from natural to anthropogenic sources occurred in the mid-1960s. Comparison of qualification impacts of climatic factors and human-induced factors on increased anthropogenic HMBR by the partial least squares path modeling (PLS-PM) implied that socio-economic activities, such as population density (PD) and gross domestic product (GDP), provided higher contributors to increased anthropogenic HMBR in XY (0.23/0.71) than FX (0.11/0.18). The comparative results of this study provided new insights into environmental monitoring and management of HM contamination for adjacent lakes with contrasting environments.