The contents of water, sugar, fatty acid, amino acids, stilbenoid and flavonoid in the seeds of Gnetum parvifolium (Warb.) C. Y. Cheng were measured. The results show that the seeds of G. parvifolium contain abundant nutritional materials. The seeds are oblong and thousand kernel weight is (2 525.67±44.54)g. The water content is (373.5±0.82)g·kg-1, the total sugar content is (496.8±4.78)g·kg-1, the total fat content is (29.1±0.21)g·kg-1, the total amino-acid content is (73.9±1.05)g·kg-1, the total flavone content is (123.2±1.73)g·kg-1; the resveratrol, isorhapontigenin and gnetol contents are (2 231.0±1.65) mg·kg-1, (1 471.7±0.72) mg·kg-1 and (212.0±1.47) mg·kg-1 respectively. The seeds contain almost all kinds of amino-acid, including 8 kinds of essential amino acids. But cystine is not found. The index of unsaturated fatty acid and the polysaccharide are high while the disaccharide, glucose and fructose in that are low. There are high contents of isorhapontigenin and total flavone in the seeds of G. parvifolium.
This study focused on the photosynthetic characteristics of Thuja sutchuenensis seedlings and its relationship with environmental factors under three light levels (full light, 50% full light, and 25% full light). The results showed that under different light environments, the maximum value of net photosynthetic rate Pn appeared at the 8:00 with the sizes were 6.48, 4.59, and 2.67 μmol·m-2·s-1. There existed "midday-depression" in the diurnal photosynthesis of T. sutchuenensis, which mostly contributed by non-stomatal factors. The results of path analysis demonstrated that among the environmental factors affecting the photosynthesis of T. sutchuenensis under different light environments, the photosynthetically active radiation and air CO2 concentration were the main decision factors, while the main limiting factor was the air temperature.