城市树木滞尘能力研究及存在的问题与对策

近年来城市树木在降低环境粉尘污染中的作用一直成为研究的热点。文中总结、分析了城市树木滞尘能力研究现状，指出研究工作中存在的主要问题:滞尘能力与滞尘量概念混淆，实验技术与评价方法不成体系，数据结果可比性差难以共享，对PM2.5等细粒子阻滞作用研究结论不一致，树木滞尘特异性研究缺乏系统性等；提出解决这些问题的具体对策:建立可比的滞尘量测定实验技术体系与树木抗性评价方法体系，建立树木滞尘能力评价方法体系，开展针对尘源、颗粒大小的滞尘特异性和针对污染粒子循环轨迹等的滞尘机理研究。

Problems and Countermeasures in Research on Urban Trees' Dust-retaining Ability

In recent years substantial research effort has focused on the role of urban trees in reducing the effect of particulate pollution. The researches about the ability of urban trees to capture the particles were reviewed here. The problems arising from these researches were pointed out, including the dust-retaining ability and the dust-retaining amount are confused in concept, laboratory technique and evaluation method fail to be systematic, the measuring results and data are difficult to share due to lack of comparability, the inconsistent conclusions in the studies on role of urban trees in reducing PM2.5 concentration, lack of systematic study on tree species specificity in dust-retaining, etc. The countermeasures to solve these problems were suggested to develop a comparable laboratory technical system for measuring the dust-retaining amount and a methodological system for assessing the influence of particulate pollution on the trees, to establish a methodology for synthetically appraising the particulate-retaining ability of trees, and carrying out a research on tree species specificity in dust-retaining based on different dust sources and particles sizes and on circular track of a particle.