随着社会经济的高速发展和高强度的人类活动，工业化和城市化带来的重金属污染问题日益引起关注。如何控制重金属对环境质量、食品安全、人体健康及社会经济可持续发展构成严重威胁和挑战已成为亟待解决的科学问题。绿化树种作为城市的肺腑能有效实现重金属污染的修复，具有生物量高、绿化覆盖面积及绿化空间辐射占有量大、低成本高效能、绿色环保等优点。本研究以典型干旱区绿洲城市，新疆首府乌鲁木齐市主要快速路两侧土壤、降尘及主要绿化树种各器官重金属富集特征和转运机理为主题，分析乌鲁木齐市快速路侧土壤、降尘和对应树种体内重金属元素浓度分布特征以及它们之间的关系；分析树种各部位在不同污染梯度下对重金属元素的富集能力、富集效能及转运机理。为重金属污染区域下绿化植物的选择及土壤修复治理提供建议，为城市绿化的合理建设及区域生态环境的改善提供理论依据。

With the rapid development of social economy and human activities of high strength, the problem of heavy metal pollution broughtby industrialization and urbanization has drawn increasing attention. How to control serious threats and challenges caused by heavy metal pollution to environmental quality, food safety, human health and sustainable socio-economic development has become a scientific problem that needs to be solved urgently. As likend to the city's lungs, greening trees can effectively restore heavy metal pollution, and have the advantages of high biomass, green coverage area, large amount of radiation in green space, low cost and high efficiency. This study is based on the characteristics of the heavy metal enrichment and transport mechanism of soils, leaf dust and main greening species in the main arid area of Urumqi, the capital of Xinjiang, and analyzes the soil, dust and corresponding tree species in the expressway side of Urumqi. The distribution characteristics of heavy metal elements and their relationship; the enrichment ability, enrichment efficiency and transport mechanism of heavy metal elements in different parts of the tree species will be analyzed. It will provide suggestions for the selection of green plants and soil remediation treatment under heavy metal pollution areas, and provide a theoretical basis for the rational construction of urban greening and the improvement of regional ecological environment.