Characteristics of tree growth and leaf damage under different O3 concentrations

Abstract

Pinus bungeana, Platycladus orientalis, Koelreuteria paniculata and Ginkgo biloba were taken to research. 3 open-top chambers with O3 concentration gradient were set up to study the characteristics of tree growth and leaf damage under different O3 concentrations. The results showed that with the increase of O3 concentration, the growth of different tree species were inhibited, but the diameter between different tree species was not significantly different. The plant height of different tree species the plant height of different tree species increased from 0.05m to 0.06m under NF O3 concentration, from 0.01m to 0.03m under NF40 O3 concentration, but from 0.01m to 0.02m under NF80 O3 concentration. The diameter of different tree species at 50cm increased from 0.90cm to 1.40cm under NF O3 concentration, from 0.70cm to 1.00cm under NF40 O3 concentration, and from 0.60cm to 0.80cm under NF80 O3 concentration. Under NF O3 concentration, the leaves of different tree species performed well, without any damage symptoms. With the increase of O3 concentration, leaves were withered and died. Leaves wilted under NF40 O3 concentration, but died and fallen under NF80 O3 concentration. Pinus bungeana and Platycladus orientalis were good at resisting O3 pollution, while Koelreuteria paniculata and Ginkgo biloba were worse. The damage of O3 concentration to plants is more sensitive to broad-leaved trees.