Abstract:In order to understand the effect of light on ash accumulation of Ardisia giantifolia, four light intensities (100%, 60%, 40% and 20% natural light intensity) and four light qualities (green, white, blue and red light) were set by using sunshade net and film, the response characteristics of height, basal diameter and biomass of A. giantifolia under different treatment conditions was analyzed, and the relationship between ash content and growth indexes was studied. The results showed that with the weakening of light intensity, the ash content of A. giantifolia decreased under green light with the decrease of light intensity, showing a “low-high-low-high” change trend under white light. Moreover, there was no significant change under blue light or red light. The ash content of A. giantifolia was the lowest under white light and 100% light intensity, showing significantly differences with that of the rest light intensity. At 60%, 40% and 20% natural light intensity, light quality had no significant effect on ash content of A. giantifolia. The ash content had no significant correlation with plant height, basal diameter and biomass of A. giantifolia. With the decrease of light intensity, the plant height, basal diameter and biomass of A. giantifolia increase, and reach maximum under white light. Therefore, it was suggested that light had effect on ash accumulation and growth index of A. giantifolia, and it was necessary to choose the forest type with proper shade intensity or canopy density when planting.