关键词: 锰;地下水;时空分布特征;流溪河;水资源保护;

Abstract: 392 groups of groundwater detection data from 28 groundwater monitoring wells in the middle and lower reaches of Liuxi River in rainy and dry seasons from 2012 to 2018 were selected to analyse spatial and temporal distribution characteristics of manganese and its influencing factors in groundwater. The results showed that the overall content of manganese in groundwater in the study area was high from 2012 to 2018, but it was generally lower than that in Guangzhou City and the Pearl River Delta. The mass concentration and over standard rate of manganese in groundwater in the middle reaches were generally higher than those in the lower reaches, and its distribution was less affected by topography. The mass concentration and over standard rate of manganese in bedrock fissure water were generally higher than that in loose rock pore water. The mass concentration and over standard rate of manganese in rainy and dry seasons had little difference, and both showed a downward trend with time, and its seasonal distribution and interannual variation were less affected by rainfall. The distribution of manganese in groundwater in the study area was mainly affected by acid-base conditions and "salt effect".

Key words: manganese; groundwater; temporal and spatial distribution characteristics; water resources protection; Liuxi River