Journal of Food, Agriculture and Environment

Accumulation of heavy metals associated with trees planted in Beijing, China

Author(s):

Shaowei Lu ¹, Lingwei Kong ^{2 *}, Shaoning Li ¹, Bo Chen ¹, Yuping Zhang ¹, Qinhua Pan ¹

Recieved Date: 2013-10-18, Accepted Date: 2014-01-24

Abstract:

Trees have been promoted for pollution control in high-density urban environments, but the actual capacity to accumulate pollutants is known for only a few woody species. Numerous shrub and tree species (i.e. Salix japonica, Salix babylonica, Pinus bungeana, Platycladus orientalis and Pinus tabuliformis) have been planted in Beijing, China, to combat air pollution. We sampled heavy metals (Cu, Cr, Pb, Zn) in soil and leaves of 5 species at four sites in Beijing and adjacent areas. The results show that 1) the soil of Jingshan Park is worst polluted by heavy metals, followed by Olympic Park, Shuiguan Great Wall and Songshan Nature Reserve, with underlying ecological risk level reducing accordingly as 36.82, 14.90, 14.10 and 13.10; 2) in a certain range of concentration, the heavy metal accumulation capacity of a blade first increases and then decreases as the heavy metal content of soil continue to rise, but the accumulation content advances continuously; 3) the blade of S. japonica has stronger capacity of accumulating Cu and Pb, which is 3.2 times that of Platycladus and 1.68 times of S. babylonica, while the blade of S. babylonica has stronger capacity of accumulating Zn, 2.66 times that of Platycladus; 4) the blade of Platycladus has stronger capacity of accumulating Cr, 1.84 times that of P. bungeana. The comprehensive accumulation capacity of different tree species is sorted in descending order as S. babylonica (1.049), S. japonica (0.808), P. tabuliformis (0.692), P. bungeana (0.681) and Platycladus (0.534).

Keywords:

Greening tree species, heavy metal, accumulation capacity

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Journal: Journal of Food, Agriculture and Environment
Year: 2014
Volume: 12
Issue: 1
Category: Environment
Pages: 508-512

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