树皮对空气颗粒物的吸附能力

发布时间：2018-09-12 17:57

【摘要】：植物树叶对去除空气颗粒物有重要作用,树皮也能吸附颗粒物,但植物的生物调节功能对树皮表面颗粒物的敏感性相对较低。本文对北京市常见的10种不同植物树皮的吸附能力进行了研究,测定了不同季节树皮对0.2~2.5、2.5~10和10~100μm 3种粒径悬浮颗粒物的单位面积吸附量,并对不同树皮的吸附能力进行分类。结果表明:树皮整体吸附颗粒物量较大,平均达2182.07μg·cm-2,其中10~100μm大颗粒物起到主要作用,占到88%左右;0.2~2.5μm和2.5~10μm的小颗粒物吸附量各占6%。对于不同气象和污染条件,大颗粒物吸附量变化较大,小颗粒物则较小。主要表现为多雾霾、少风雨的季节吸附量较大,多降雨、多大风的季节吸附量较小。树皮表面吸附的颗粒物会有部分二次悬浮,部分被降雨去除,部分继续在树皮表面积累。不同树皮表面颗粒物吸附能力具有显著差异,其受树皮表面的结构和性质影响,主要分为4类:(1)强吸附能力、低水分、少脂质的较粗糙树皮;(2)弱吸附能力、高水分、多脂质的光滑树皮;(3)中等吸附能力、有裂纹或浅纵裂树皮;(4)对不同粒径颗粒物差异性吸附的开裂树皮。本研究证明了树皮可减少空气颗粒物,为今后通过城市绿地规划、减少空气颗粒物对人体的危害提供了相关的理论基础。
[Abstract]:Plant leaves play an important role in the removal of airborne particulate matter, and bark can also adsorb particulate matter, but the biosensitivity of plant biological regulation to particulate matter on bark surface is relatively low. In this paper, the adsorption capacity of 10 kinds of different plant bark in Beijing was studied, and the adsorption capacity per unit area of three kinds of suspended particles of 0.2 ~ 2.5U ~ (2.5) and 10 ~ 100 渭 m in different seasons were determined, and the sorption capacity of different bark was classified. The results showed that the total amount of particles adsorbed by bark was larger, with an average of 2182.07 渭 g cm-2, in which 10 渭 m and 100 渭 m played a major role, accounting for about 88% of the adsorption capacity of small particles with 0.2 渭 m and 2.5 渭 m respectively. For different meteorological and pollution conditions, the adsorption capacity of large particles varies greatly, while that of small particles is smaller. The main results were as follows: more haze, less wind and rain, more rainfall and less strong wind. Some of the particles adsorbed on the bark surface will be suspended twice, some will be removed by rainfall, and some will continue to accumulate on the bark surface. The adsorption ability of particulate matter on different bark surfaces is significantly different, which is influenced by the structure and properties of bark surface. Smooth bark with many lipids; (3) medium adsorption ability with crack or shallow longitudinal crack bark; (4) cracked bark with different particle size. This study proved that bark can reduce air particulate matter, which provides a theoretical basis for reducing the harm of air particulate matter to human body through urban green space planning in the future.
【作者单位】：北京林业大学水土保持学院城乡生态环境北京实验室;中国东盟环境保护合作中心;中国科学院生态环境研究中心城市与区域生态国家重点实验室;
【基金】：北京市共建项目专项(城乡生态环境北京实验室) 国家林业公益性行业科研专项(201304301) 科技创新服务能力建设-协同创新中心-林果业生态环境功能提升协同创新中心(2011协同创新中心)(市级)(PXM2016_014207_000038)资助
【分类号】：X513;X173

【相似文献】