Abstract: In this paper, greenhouse Phellodendron amurense seedlings were shaded with red, yellow, blue, and green films for 100 days, and their biomass, chlorophyll and soluble protein contents, and nitrate reductase and glutamine synthetase activities were determined. Compared with exposure under sunlight, color films shadingdecreased the seedlings biomass significantly. Plant height and stem diameter hadthe similar trend with plant biomass. Root/shoot ratio was less affected by red andyellow films shading, while root biomass was decreased significantly under blueand green films shading. Leaf chlorophyll content was increased significantly underthe shading with blue, green and red films, especially with blue film. Red filmshading increased the chlorophyll a/b ratio, while blue film shading was in adverse.Under color films shading, soluble protein content and nitrate reductase andglutamine synthetase activities were significantly higher than the control.

Key words: Biomass, Net primary productivity, Artificial tropical rainforest