研究广州市城市森林净化大气的功能价值。结果表明: 城市森林主要树种抗硫强度为7.740~0.051 mg·g-1; 单位面积各森林类型的硫净化量为365.278~36.836 kg·hm-2a-1; 每年净化大气硫的现实值为1.433万t·a-1,折合成SO2为2.865万t·a-1,净化大气SO2潜力5.683万t·a-1;城市森林植物中吸氟能力强的有仪花、银柴和榕树,最差的是柑桔; 四旁散生森林类型吸氟能力最大,经济林最差,城市森林每年吸收氟量3 078.52t·a-1,折合成氢氟酸为3 240.45 t·a-1; 广州城市森林类型组合成7个绿地类型,各类绿地类型晴天和阴天的平均滞尘率为23.5%~53.5%,全市绿地平均滞尘率为39.93%,城市森林的滞尘总量为6.076 万t·a-1; 城市森林每年净化大气SO2、氢氟酸和滞尘的功能价值为113 796.54万元。
This paper studies on the functional value of urban forest in Guangzhou about its purifying SO2,hydrofluoric acid and intercepting dust. The result shows that, the anti-sulfur intensity scale of main urban forest is between 7.740 and 0.051 mg·g-1. Different types of tree purification capacity of sulfur is 365.278~36.836 kg·hm-2a-1, and its total value is 1.433×10 4 t5a-1, which equals to 2.865×104 t SO2·a-1 And its potential purification capacity of SO2 is 5.683×10.4 t·a-1; urban forest can absorb fluorine 3 07852 t·a-1, equal to hydro fluoric acid 3 240.45 t·a-1, among them, Lysidice rhodostegia, Aporosa chinensis and Chinese banyan are good at absorbing fluorine, while Citrus is the worst; the open forest along urban has the biggest capacity of absorbing fluorine(22.551 kg·hm-2a-1), and the economic forest the worst(1.974 kg·hm-2a-1); The urban forest in Guangzhou can be classified into 7 types, their average percentage of dust catching capacity is between 23.5% and 53.5% in fine and overcast days, the total average percentage is 39.93%,and the total amount is 6.076×104 t·a-1; the filtering SO2and hydrofluoric acid, and catching dust functional value of the urban forest in Guangzhou City is 113 796.54×104 yuan·a-1.
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