Abstract:

In order to study the light intensity that is beneficial to the growth and development of Bromeliaceae, the effect of light intensity on growth and development of Bromeliaceae ‘Dennis’ were studied in greenhouse using different shading light treatment. The results showed: the contents of chlorophyll a, chlorophyll b and cartenoids were the highest under 75% natural light intensity, followed by 50% and 25% natural light intensity treatment; Different shading light treatment improved the nitrogen content of Bromeliaceae leaves and improved range were 227.2%, 98.2%, 85.9% respectively compared with the control, especially 75% natural light treatment highest. However, the nitrogen content of roots was less influenced under all treatments; The carbon content of leaves and roots increased 153.3% 33.3% respectively compared with the control, but the C/N of leaves was lowest and C/N of root was highest under 75% natural light intensity treatment; The soluble sugar content and plant growth potential were the strongest under 75% natural light intensity treatment. In short, the 75% natural light intensity, namely 22.5-30 thousand Lux, is the most suitable light condition in the hot season of Taiyuan area.