不同污染条件下绿化树种对大气二氧化硫吸收积累能力的研究

采用HNO3-HClO4消煮、BaSO4比浊法测定了徐州市污染区和相对清洁区13种树种叶片中的含硫量,通过单因素方差分析和系统聚类分析,比较了各树种间对大气SO2吸收积累能力的差异性,以期筛选出对SO2净化能力强的树种,为未来徐州市城区绿化结构调整与改造提供科学依据。结果表明:在同一污染条件下,各树种对SO2的吸收积累能力普遍存在极显著差异,随着大气SO2污染的加重,差异越显著;同种树种在不同污染条件下对SO2的吸收积累能力普遍存在极显著差异;女贞对大气SO2具有很强的吸收积累能力,意大利杨、法国梧桐和雪松对大气SO2具有很强的吸收积累的潜在能力,女贞、意大利杨、法国梧桐和雪松是用于净化大气SO2的理想树种。针叶树种对SO2的吸收积累能力普遍弱于阔叶树种。

Research on Absorption and Accumulation Capacity of Tree Species to SO2 Under Different Polluted Conditions

HNO3-HClO4 digestion and BaSO4 turbidimetry methods were used to determine the sulfur content in 13 kinds of tree leaves in polluted and relatively clean area.Through the single-factor analysis of variance and cluster analysis,the differences of absorption and accumulation capacity for SO2 between the various species were compared.The species with strong ability to purify SO2 were filtered to provide a scientific basis for future restructuring and transformation of green species.The results showed that in the same polluted conditions,absorption and accumulation capacities of the species for SO2 had prevalence significant differences.With the increase content of SO2,the differences were more significant.The absorption and accumulation capacities of one species for SO2 had prevalence significant differences under different polluted conditions.Ligustrum lucidum had a strong ability to absorb and accumulate SO2.Populus euramevicana cv,Platanus ×acerifolia and Cedrus had strong potential abilities of absorption and accumulation for SO2.Ligustrum lucidum,Populus euramevicana cv,Platanus ×acerifolia and Cedrus were ideal species for purifying SO2.Conifer species’ absorption and accumulation ability for SO2 was generally weaker than broad-leaved species.