Characteristics of heavy metals accumulation in plant leaf dust in residential area
The leaves of 7 different green tree species including Ligustrum compactum in urban residential areas were selected as research materials to determine the dust retention per unit leaf area and heavy metal content in leaf surface,and the correlation between the two were analyzed to screen the adsorption and retention capacity of different green tree species on heavy metals in atmospheric dust. The results showed that the dust retention per unit leaf area was as follows: Pittosporum tobira(2.50 g/m2)> Ligustrum japonicum(2.26 g/m2)> Osmanthus(2.01 g/m2)> Ligustrum compactum(1.50 g/m2)> Magnolia Grandiflora(1.20 g/m2)>Cinnamomum camphor (1.11 g/m2)> Buxus megistophylla(0.97 g/m2). The order of heavy metal content in leaves were Mn(49.026 mg/kg)>Cr(5.308 mg/kg)>Cu (5.138 mg/kg)>Ni(2.436 mg/kg)>Pb(1.986 mg/kg)>As(0.359 mg/kg)>Cd(0.063 mg/kg). There were a significant correlation(P<0.01)between Cr-Ni,Cr-Cu,Mn-Ni,Mn-Cu,Mn-Cd,Ni-Cu,As-Pb and Cr-Ni,Mn-Cu,Cu-Cd in leaf dust. There were a significant positive correlation(P<0.05)between Cr-Mn,Cr-As,Ni-As,Cu-Cd in leaf dust and Cr-Cd,Cu-As in leaf dust. Pittosporum tobira had a strong dust retention ability and heavy metal adsorption ability to atmospheric dust,which could be used as the preferred tree species for urban greening.
residential areagreening tree speciesheavy metalsdust retention capacity
万方数据
维普
