• 研究报告 •

### 三峡库区不同植被类型消落带土壤重金属含量的时空变异

1. (1中国林业科学研究院森林生态环境与保护研究所， 国家林业局森林生态环境重点实验室， 北京 100091；2南京林业大学南方现代林业协同创新中心， 南京 210037； 3湖北林业科学研究院， 武汉 430075)
• 出版日期:2018-08-10 发布日期:2018-08-10

### Temporal and spatial variation of soil heavy metal contents in different vegetation types in Three Gorges Reservoir area.

GUO Yan1,2, CHENG Rui-mei1,2*, YANG Shao1,2, SHEN Ya-fei1,2, XIAO Wen-fa1,2, LEI Lei1,2, WANG Xiao-rong1,3

1. (1Research Institute of Forest Ecology, Environment and Protection, Chinese Academy of Forestry/Key Laboratory of Forest Ecology and Environment, State Forestry Administration, Beijing 100091, China; 2CoInnovation Center for Sustainable Forestry in Southern China, Nanjing Forestry University, Nanjing 210037, China; 3Hubei Forestry Academy, Wuhan 430075, China).
• Online:2018-08-10 Published:2018-08-10

Abstract: In this study, transfer characteristics and the spatial and temporal variation of metal ions were investigated by measuring concentration of heavy metals in soil from waterlevel-fluctuating zone (flooded elevation: 145-175 m; control elevation: 175-185 m) at Zigui, Three Gorges Reservoir area in 2009 and 2015. Using the geo-accumulation index, we evaluated the pollution degree of heavy metals at different elevations in two waterflooded years. The results showed that the contents of heavy metals accumulated in soil at different altitudes both in 2009 and 2015 were in order of Fe>Mn>Cu (Zn). With the increased duration of flooding years, more heavy metals accumulated in secondary shrub land than in abandoned farmland. The accumulation of soil heavy metals was more obvious in low altitude area, and the flooded elevation facilitated the accumulation of Cu and Fe, while the control elevation facilitated the accumulation of Zn and Mn. The migration of heavy metals did occur in soil of various vegetations: with the increase of water level fluctuation period, the contents of Cu and Zn at water elevation in secondary shrub land was increased, up to 41.1%, 23.1%, 50% and 9.3%, and 28.6%, 50%, 38.6% and 56.8%, respectively. The contents of Cu and Zn in abandoned farmland decreased, with decreasing ranges of 28.3%-48.5% and 15.5%-29.9%, respectively. Through pollution assessment (Igeo), it was found that, after seven times of water level fluctuation, the soil in secondary shrub land was mainly affected by comprehensive pollution (including Cu, Zn, Fe and Mn) while the abandoned farmland was mainly affected by compound pollution (including Fe and Mn).