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《Journal of Jiangsu Forestry Science & Technology》 2006-05
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Study on the assimilativen effect of the roadside forest belts on heavy metals,S and N

LU Dong-hui ~(1,2),YIN Yun-long ~(1*),XU Jian-hua ~(1),YU Chao-guang ~(1)(1.Institute of Botany of Jiangsu Province and the Chinese Academy of Sciences,Nanjing 210014,China;2.Life Science College of Nanjing Agriculture University,Nanjing 210095,China)  
This article studies on contents of nine heavy metals,S and N in soil and tree leaf blade on roadside Taxodium spp.and Populus spp.forest belts.Indexes such as heavy metal contents distribution in eight different parts of Populus spp.tree,e.g.its bark,branch bark,leaf blade adsorption quantity and ratio to heavy metals etc were also researched.The results showed that,contents of heavy metals such as Al,Fe,Mn,Cu,Zn,As,Cd,Cr and Pb in the surface layer soil of roadside forest belt were all higher than those at relative clean site——Botanical Garden to different extents,among which contents of Fe,Mn and Cd increased remarkably.Contents of S and N were much more approaching to or lower than the relative clean site while N content significantly descended. Taxodium spp.leaf had an obvious assimilation and accumulation effect on the elements of Al,Fe,Mn,Cu,Zn,As,Cr,Pb and N under highway environment;Every heavy metal content in tree leaves tested all manifested that the more distance is apart from the highway,the lower is its content;but N content notably increased with the distance rising,but didn't that in tree leaves of Populus spp.along the road.Except for As and S,contents of other elements were all higher than those at relative clean site to varying degrees,with distinct enhancement in Al,Fe,Cu,Pb and N contents;Only at B section,did contents at Al,As and N in forest belt leaves express a significant descending trend with increasing distance apart from the highway.Furthermore,there were some differences among assimilation and adsorption abilities to heavy metals for each parts in Populus spp,that was prominent accumulation superiority in Al,Fe and Mn in the fine roots and leaf blades to other parts;fine roots and secondary root bark surpassed others in Cr,Pb and Ni assimilation.Adsorption ability of the leaf blades to Al,Fe and Pb was beyond that of trunk bark and branch bark.
【Fund】: 国家科技部重大基础项目“典型区土壤和植物中重要化学物质的时空分布规律和风险预测”(2002-CB-410810);; 江苏省自然科学重点基金(BK2002074)项目的资助
【CateGory Index】: X131.1
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