The decrease in Pn by dusting in plants such as Ginkgo biloba, Pinus thunbergii Parlatore, Pittosporum tobira and Jasminum nudiflorum was mainly due to the inhibition of stomatas;

• 深入分析表明尘污染处理引起银杏、黑松、海桐、迎春等植物叶片净光合速率下降的主要原因是由于叶片气孔受到了限制；