Abstract: This paper summarized the research progress about the effects of UV-B radiation on the sugar content in plant leaf, stem, root, fruit, and grain. Some critical reactions and enzymes relevant to plant sugar metabolism were analyzed, and the possible mechanisms of the effects of UV-B on them were demonstrated from the aspects of photosynthetic carbon fixation, and sugar synthesis and decomposition. Further research directions in this field were prospected.

Key words: Black-crowned night heron, Little egret, Chinese pond heron, Cattle egret, Heavy metal, Bio-monitoring, Bio-indicator