沈阳地区主要树木净化SO2潜力及植树定额的估算

通过实地测定和熏烟实验 ,揭示了沈阳地区不同类型树木的总生物量、SO2 吸收强度和S的吸转周期数 ,三者的乘积是树木净化SO2 的总潜力 ,为 4 .39× 10 6kg ,约占沈阳年排S量 12 0× 10 6kg的 3.6 6 % .树木平均最高可净化S 12 .19kg·km-2 ·d-1.沈阳现有树种组成的平均吸S量为 0 .70kg株-1·年 -1;若以阔叶乔木平均吸S量 1.35kg·株 -1·年-1计 ,欲全部净化沈阳的年排S量 ,需要阔叶乔木 8888× 10 4株 ,相当于现有树木株数的 12 .9倍 .经推算 ,在增强环保力度、减少年排S量 2 0 %的条件下 ,再扩植现有树木1.0倍的阔叶乔木 ,即可使沈阳大气SO2 浓度下降到 0 .0 6mg·m-3 以下 ,成为环境达标城市

Potential of purifying SO\-2 of main tree species and their planting quota in Shenyang area

The total potential of purifying SO2 of main tree species was studied by using the combination of field measurement and fumigation experiment in this paper. The integrated value of purifying SO2 including total bimass, absorption intensity of SO2, and absorption-transformation periods of sulfur by trees was 4.39 x 10(6) kg, which was accounted for 3.66% of total sulfur released per year in Shenyang. It indicated that the maximum daily potential of purifying SO2 of trees might be 12.19 kg.km-2. Supposed that the average annual absorption capacity for sulfur of trees in Shenyang was 0.70 kg per tree and the average annual absorption capacity for sulfur of broad-leaved trees was 1.35 kg.tree-1, 88.88 million broad-leaved trees would be required to purify the annual released SO2 thoroughly. This number was equivalent to 12.9 times of existing trees. On the conditions of strengthening environmental protection and decreasing 20% of annual released sulfur, if the broad-leaved trees was double of the present number, SO2 content in air might be below 0.06 mg.m-3 and Shenyang would become a standardizing city with clear air.