Abstract: With the destruction of ozone layer,ultraviolet-B (UV-B,280～320nm) radiation has being enhanced at the earth’s surface.The energy of UV-B irradiation is far higher than that of visible light,which could be absorbed by biomacromolecules such as protein and nuclei acid.Enzyme is a sort of protein catalyzing the biochemical processes,and its content and activity in plant have strong responses to enhanced UV-B radiation.This paper summarized the research advances in the effects of enhanced UV-B radiation on the key enzymes,mainly including antioxidant enzymes,ribulose-1,5-diphosphoscarboxylase,nitrate reductase and glutamine synthetase in terrestrial plants. Some suggestions for future research in this field were put forward.

Key words: Forest soil seed bank, Natural regeneration, Temporal and spatial pattern