[1]ZHANG Zhen-ming,LIN Shao-xia,ZHANG Qing-hai,et al.Distribution Pattern of the Heavy Metals and Its Pollution Load in Caohai Wetland[J].Research of Soil and Water Conservation,2014,21(02):279-284.
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Distribution Pattern of the Heavy Metals and Its Pollution Load in Caohai Wetland
Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
21
Number of periods:
2014 02
Page number:
279-284
Column:
Public date:
2014-04-28
- Title:
- Distribution Pattern of the Heavy Metals and Its Pollution Load in Caohai Wetland
- Keywords:
- Caohai Lake; wetland soil; sediments; heavy metals; pollution load
- CLC:
- X131.3
- DOI:
- -
- Abstract:
- This paper examined the content of 7 toxic heavy metals in the wetland soil and the surface sediment of Caohai Lake, then compared spatial and temporal variability of the contents of heavy metals, and also assessed the heavy-metal pollution of the sediment, swamp, farmland and woodland in this region through the single factor pollution index and the pollution load index at the same time. The results showed that the contents of Cd, Zn and Hg were significantly higher than the soil background values of Guizhou Province, the contents of Cd and Zn in the sediment were far greater than those in the farmland, followed by swamp, and the woodland fourth. The content of Cr was the first in swamp, the second in woodland, the third in farmland and the fourth sediment. The contents of Pb and Cu were the first in farmland, the second in sediment, the third in swamp and the fourth in woodland. The content of Hg was the first in sediment, the second in swamp, the third in farmland and the fourth in woodland. The content of As was the first woodland, the second in farmland, the third in swamp and the fourth in sediment. The contents of Cd and Hg in the farmland and swamp surrounding Caohai Lake have reached level of heavy pollution, but content of Zn was at the level of moderate pollution, contents of Pb and As were at the level of light pollution. The levels of Cd, Hg and Zn in sediment of Caohai Lake have reached heavy pollution while contents of the other 4 have not caused pollution. The heavy-metal pollution of the sediment in Caohai Lake can be classified into the medium level, and it became more severe during the dry season. Especially, the sampling point near the center of the lake was more seriously polluted. For the three sampling region, the further the sampling point from the lakeshore was, the more serious the contamination was. With respect to the four kinds of soils, it was found that the sediment was contaminated most severely followed by the farmland, then swamp, while the woodland was pollution-free. It is supposed that this study could provide some fundamental data for the prevention and control of the heavy-metal contamination of Caohai Lake.
- References:
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