<正>研究了南方主要绿化树种对重金属的积累特性，结果表明：同一树种中Pb、Cd、Hg、As的含量差异较大，相同元素在不同树种中的含量也存在一定差异，不同树种的重金属含量一般随环境污染程度的增加而升高，即从高至低依次为市区、近郊、远郊，市区树种中Pb、Cd、Hg、As的平均含量分别比远郊的增加62％、103％、187％、104％。垂枝榕Ficus beniamina‘Exotica’、菩提树F. religiosa、凤凰木Delonix regia、南洋杉Araucaria cunningghamii分别对Pb、Cd、Hg、As的积累作用较大，宜用这些树木进行重金属污染的治理和修复，洋紫荆Bauhinia variegata、南洋杉、高山榕F. altissima、小叶榕F. microcarpa分别对Pb、Cd、Hg、As的抗性最小、即敏感性最强，可用于重金属污染的监测。

Bursaphelenchus xylophilus, B. mucronatus and the other nematodes separated from dead pine. were detected by using primer K09F2/R. The results indicated that the PCR product of all B. xylophilus isolates had a clear and bright fragment about 340bp. But B. mucronatus and other nematodes had not any fragments. So pairwise K09 F2/R was used for constructing identification kit of B. xylophilus. It took a short time to identify nematodes by adopting this kit. The time of total detection process was within two and half hours. Besides, the sensitivity of this kit reached to 1/7 of a nematode. The detection result is easy to estimate, and the cost of detection is quite low. This kit is a rapid, reliable and convenient means for detecting B. xylophilus.