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应用15N研究光强度对金钗石斛吸收氮素的影响 ,结果表明 :光强度为 2× 1 0 4 Lx处理 ,在石斛生长的四个阶段吸收营养液中氮量分别比光强度为 5× 1 0 3 Lx处理高 2 6 .5 4% ,5 0 .0 7% ,31 .1 1 %和 2 2 .2 2 % ;吸收木屑培养基质中的氮量分别提高 32 .84% ,43.41 % ,2 1 .85 %和 1 9.0 1 % ;吸收总氮量分别提高 2 9.1 9% ,46 .44 % ,2 6 .0 1 %和 2 0 .5 1 %。在石斛生长的四个阶段 ,光照强度为 2×1 0 4 Lx处理 ,植株干物重分别比 5× 1 0 3 Lx处理提高 1 2 .40 % ,2 2 .2 2 % ,1 7.0 8%和 1 5 .0 0 % ;但是 ,光照强度为 5× 1 0 3 Lx处理根干物重较光强为 2× 1 0 4 Lx处理高 1 8.2 1 % ,9.6 3% ,1 0 .0 4%和 1 8.45 %。
The effects of light intensity on the nitrogen uptake by Dendrobium nobile Lindl. Were studied using 15N. The results showed that the light intensity was 2 × 10 4 Lx, and the N absorption of nutrient solution in the four stages of the growth of Dendrobium was 5 × 1 0 3 Lx treatment increased by 26.54%, 50.07%, 31.1% and 22.2% respectively. The amount of nitrogen in the medium for absorption of sawdust increased by 32.84% and 43.41%, respectively, 2 1 .85% and 1 9.0 1%, respectively. The total nitrogen uptake increased by 21.99%, 46.44%, 26.0% and 20.5% respectively. In the four stages of the growth of D. officinale, the light intensity was 2 × 104 Lx, and the plant dry matter weight was increased by 12.2%, 22.2% and 17.0% compared with 5 × 10 3 Lx 1 5 .0 0%. However, the root dry weight of the treatments with light intensity of 5 × 10 3 Lx was 1 8.2 1%, 9.6 3% and 10.04% higher than the light intensity of 2 × 10 4 Lx 1 8.45%.