保定市常见城市绿化树种对PM2.5滞纳能力的研究

为了探究绿化树种对改善城市污染的影响,选取保定市11种常见城市绿化树种,对其滞纳PM2.5能力进行了探讨。利用冠层分析仪(LAI-2000)、叶面积扫描仪和气溶胶再发生器(QRJZFSQ—I)测定各树种的叶面积指数、单位叶面积PM2.5滞纳量,并计算单位绿地面积PM2.5滞纳量,结果表明:叶面积指数、单位叶面积PM2.5滞纳量、单位绿地面积PM2.5滞纳量3个指标,都是针叶树大于阔叶树,说明针叶树对PM2.5的滞纳能力高于阔叶树;针叶树、阔叶树叶面积指数范围分别为2.172 1~3.026 3、0.873 8~2.120 5,单位叶面积PM2.5滞纳量范围分别为0.53~1.39mg/m~2、0.11~0.34mg/m~2,单位绿地面积PM2.5滞纳量范围分别为1.151 2~4.206 6mg/m~2、0.108 8~0.622 8mg/m~2。

Study on the payment ability of common greening tree species to PM2 .5 in Baoding

To explore the effects of greening tree species on improving urban pollution ,this study selected 11 common greening tree species and analyzed their payment ability to PM 2 .5 in Baoding city .Leaf area index was measured by a LAI—2000 canopy analyzer ,the amount of PM2 .5 per unit leaf area was measured by leaf area scanner and aerosol generator (QR‐JZFSQ—1) ,and the amount of PM2 .5 for each individual greening area was also calculated . It was shown that the confier was greater than broad leaf trees for leaf area index ,the amount of PM 2 .5 per unit leaf area ,and the amount of PM 2 .5 of each individual greening area ,and the ability of absorbing PM 2 .5 of conifer to be stronger than that of the broad leaf trees . The conifer LAI range from 2 .172 1 to 3 .026 3 ,and the LAI of broadleaf trees range from 0 .873 8 to 2 .120 5 .The amount of PM2 .5 per unit leaf area of the conifer from 0 .53 mg/m2 to 1 .39 mg/m2 ,and that of broad leaf trees range from 0 .11 mg/m2 to 0 .34 mg/m2 .The a‐mount of PM2 .5 for each individual greening area was also calculated ,it range from 1 .151 2 mg/m2 to 4 .206 6 mg/m2 ,and from 0 .108 8 mg/m2 to 0 .622 8 mg/m2 for confier and broad leaf trees respectively in the paper .