光质和光强变化对油松幼苗生长及非结构性碳水化合物的影响OA北大核心CSTPCD

In order to study the effects of different light qualities and intensities on the growth of Pinus tabuliformis seedlings,5-month-old container seedlings were cultivated as materials.Three different light sources were adopted to conduct the experiment for 4 months:mixed light sources of red:blue:green(6.5∶1.2∶2.3,RBG),red∶blue(5∶1,RB),and full-spectrum(control).Under RBG and RB light source conditions,three different light intensities with photon flux of 90,150 and 210 µmol·m-2·s-1 were set at 50 cm,respectively.The results showed as follows.1)Under RB and RBG light quality treat-ments,except for W1 treatment,the seedling height and ground diameter of P.tabuliformis seedlings were higher than those of the control,which reached the standard of first grade of one-year-old seedlings.When the light intensity was 210 μmol·m-2·s-1 under RBG treatment,the seedling height and ground diame-ter were the largest,149.44％and 152.00％of those of the control,respectively.2)Under mixed light treatments,the whole plant dry weight,root-shoot ratio,root allocation rate and seedling strength index were the highest when the light intensity was 210 μmol·m·s-1.3)The starch content of P.tabulifor-mis seedlings changed significantly when the light intensity was 150 μmol·m-2·s-1 under RB light quali-ty treatment,while the soluble sugar content was the highest when the light intensity was 210 μmol·m-2·s-1 under RBG light quality treatment,and the conversion between soluble sugar and starch content was rela-tively stable.4)The whole plant biomass,ground diameter and seedling height were positively correlated with starch content and negatively correlated with soluble sugar content under RB and RBG light treat-ments(P＜0.01).