太原地区某些植物净化二氧化硫潜力的研究

 本文以研究某些树木和农作物(以下简称植物)对SO2的净化潜力来评价太原地区大气环境容量中的生物净化参数。内容包括三部分:植物年生物量的调查；用人工模拟熏气试验测定植物吸收SO2的强度和吸收转运周期；以及该地区植物净化SO2潜力的估算。太原地区树木叶片的年生物量约18万吨．树叶平均吸收SO2的强度为1.9%。SO2在树叶中的吸收转运周期约30天。树叶旺盛生活期约90天，相当于三个周期．由此计算可得本地区树木叶片每年吸收SO2的总量约一万吨。郊区农作物年生物量总计为25万吨．农作物吸收SO2的强度为0.45％．SO2吸收转运周期为20天。作物旺盛生活期为40天，相当于两个周期。计算得出本地区农作物吸收 SO2的总量约两千余吨。把树木和农作物年吸收SO2量之和，作为全年植物净化SO2的总量，约1.2万吨。在所研究的525平方公里范围内，平均每平方公里内的植物每年净化SO2的最大潜力约为24吨。在加强污染源治理和控制排放的前提下，利用植物净化大气S02是一条经济、简便和有效的补充措施。

A STUDY OF THE SO_2 ELIMINATION CAPACITY OF SOME PLANTS IN TAIYUAN

The present paper is a study of the SO_2 elimination capacity of some plants in Taiyuan to assess the biological elimination parameters in the environmental atmospheric capacity in the city. The study includes three parts: 1) Investigation on the annual biomass of plants; 2) Determination of the SO_2 absorptive intensity of plants and the period of SO_2 absorptiontransformation-transportation by their leaves by means of simulated fumigation; 3) Assessment of the total SO_2 elimination capacity of the plants in this area.In Taiyuan, the biomass of tree leaves is 180,000 tons per year and their average SO_2 absorptive intensity is 1.89%. The period of SO_2 absorptiontransformation-transportation of the leaves is about 30 days, and the activity duration of the leaves is 90 days, three times as long as the period. Therefore, all the trees in Taiyuan can absorb about 10,000 tons of SO_2 every year.In the suburbs of this city, the crop biomass is 250,000 tons per year. The absorptive intensity is 0.45%, The period of SO_2 absorption-transformation-transportation is 20 days. The activity duration of crop is about 40 days, two times the period. So the crops in the suburbs could absorb about 2,000 tons of SO_2 per year. The total amount of SO_2 absorbed by both trees and crops, about 12,000 tons, is regarded as the total SO_2 eliminating capacity of the plants over the area every year. Within the investigated range of 525 square kilometers, the maximum average potential SO_2 eliminating capacity of the plants is 24.0 tons/sq.km/year.The results suggested that the elimination of SO_2 from the air with plants is an economic, convenient and effective way, in addition to treatment of pollution sourses and control of pollutant discharge.