为了揭示喀斯特深水型水库溶解态重金属时空变化的影响因素及来源，本文选取珠江流域龙滩水库为研究对象，分析了2019年7月和2020年1月的库区分层水、汇入库区的支流表层水以及下泄水中的溶解态重金属和水化学参数。通过主要离子Piper图，不同种类重金属间的Pearson相关分析，聚类分析，环境因子与溶解态重金属间的CCA分析，结果表明流域碳酸盐岩风化是龙滩水库溶解态重金属的重要外部来源。水库水体季节性热分层所导致的水柱相对稳定度的变化是影响研究区域溶解态重金属时空分布的主要因素，较高的水柱相对稳定性通常会促进Cr，Cu的释放，而较低的水柱相对稳定性会促进Fe，As的释放。该研究为水动力条件与溶解态重金属间关系的探究提供一定的理论依据，同时对喀斯特深水型水库水资源科学利用与保护具有重要指导意义。

In order to reveal the influencing factors and sources of the temporal and spatial variation of dissolved heavy metals in karst deep-water reservoirs, this paper selected Longtan Reservoir in Pearl River Basin as the research object, and analyzed the dissolved heavy metals and hydrochemical parameters of stratified water, tributary surface water and discharged water in July 2019 and January 2020.Through piper diagram of main ions, Pearson correlation analysis among different kinds of heavy metals, cluster analysis and CCA analysis between environmental factors and dissolved heavy metals, the results show that the weathering of carbonate rocks in the basin is an important external source of dissolved heavy metals in Longtan Reservoir. The change of relative water column stability (RWCS) caused by seasonal thermal stratification of reservoir water body is the main factor affecting the spatial and temporal distribution of dissolved heavy metals in the study area. Higher RWCS usually promotes the release of Cr and Cu, while lower RWCS promotes the release of Fe and As. This study provides a theoretical basis for exploring the relationship between hydrodynamic conditions and dissolved heavy metals, and has important guiding significance for scientific utilization and protection of water resources in karst deep-water reservoirs.