【摘要】 PM₁₀和PM_2.5是大气雾霾重要来源。为探究绿化针叶树种滞尘能力，本研究以冀西北张家口市油松、侧柏、白皮松、青杄4种针叶树种为研究对象，分析不同树种、月份之间叶片滞纳PM₁₀和PM_2.5差异。结果显示：（1）针叶树种PM₁₀滞纳量在1.89～2.64μg·cm^-2之间，PM_2.5滞纳量在0.63～0.80μg·cm^-2之间，其中，油松PM₁₀和PM_2.5滞纳量均最大，青杄均最小，不同树种之间均无明显差异。（2）10月PM_2.5和PM₁₀滞纳量均最大(1.40μg·cm^-2、4.43μg·cm^-2),8月均最小(0.41μg·cm^-2、1.12μg·cm^-2),10月份平均滞纳量显著均大于其他月份。（3）每公顷每年PM₁₀和PM_2.5滞纳量排序均为油松>白皮松>侧柏>青杄。（4）油松叶片较粗糙，叶片表面分布着大量毛孔以及凹槽和凸起，叶片滞纳大气颗粒物最大。研究结果可为林木滞尘量和减缓雾霾风险评估提供参考。更多还原

【Abstract】 PM₁₀ and PM_2.5 are important sources of atmospheric haze.In order to explore the dust retention capacity of green coniferous tree species,four coniferous tree species,Pinus tabulaeformis,Platycladus orientalis,Pinus bungeana and Picea wilsonii in Zhangjiakou City,Northwest Hebei Province, were studied in this study.The differences of PM₁₀ and PM_2.5 retention in leaves of different tree species and months were analyzed.The results showed that:（1）The PM₁₀ retention of coniferous species was between1.89-2.64μg·cm^-2,and the PM_2.5retention was between 0.63-0.80μg·cm^-2.Among them,the PM₁₀and PM_2.5retention of Pinus tabulaeformis were the largest,and that of Picea wilsonii was the smallest.（2）The retention of PM_2.5 and PM₁₀ was the largest in October(1.40μg·cm^-2、4.43μg·cm^-2),and the smallest in August(0.41μg·cm^-2、1.12μg·cm^-2).The average amount of detention in October was significantly greater than that in other months.（3）The order of annual PM₁₀ and PM_2.5 detention amount per hectare was Pinus tabulaeformis >Pinus bungeana >Platycladus orientalis >Picea wilsonii.（4）The leaves of Pinus tabulaeformis Carr. are relatively rough.There are a large number of pores,grooves and bulges on the surface of the leaves.The research results can provide reference for forest dust retention and mitigation of haze risk assessment.更多还原