重庆某些树种对SO2的耐性和净化能力的研究

本文研究重庆市绿化树种对SO_2的耐性和净化能力,为针对大气污染的绿化树种选择和树种区域配置提供科学依据。用开顶式熏气装置对树苗进行人工SO_2处理,确定树木的SO_2急性和慢性伤害阈值剂量。根据植物对SO_2的净化能力是叶片对硫的积累强度和运转速率的函数这一原理,用熏气前后叶片硫含量的变化估算树木净化SO_2的能力。耐性大和净化能力强的树种(杉木、喜树和香樟等)可做为优先选择树种。耐性大而净化能力弱的树种(洋傀等)泡可选用。在SO_2污染程度不同的各区,宜配置相应的不同耐性和净化能力的树种。

Tolerance and Purification Capacity of Some Species of Trees against Sulfur Dioxide

In order to determine the threshold doses of acute and chronic injury by SO₂, the saplings fumigated with SO₂ in the open top chamber were conducted. According to "the principle that purification capacity of SO₂ by trees is in a function of sulfur intensity accumulated in leaves and its transfer rale out of leaves, the purification capacity of a tree can be estimated in varied sulfur contents in the leaves before and after fumigation. The experimental results show that the trees Cuninghamia lanceolate, Camptotheca acuminata, Cinnamomum plylyphylum possess strong tolerance and higher purification capacity against SO₂, but the capacity of Robinia pscudoa-cacia etc are lower. Chongqing is a city with heavier SO₂ pollution, so the said trees can be selected for gre-ening around the urban districts.