光照强度和种子大小对豆科植物萌发及建植的影响

In this study,we used 16 common species of leguminous seeds from the eastern Qinghai-Tibetan Plateau as the research object to statistics seedling emergence rate, survival rate and establishment rate under four different illumination gradient.The result of this experiment showed that, on the whole, the seed germination rate and planting rate are lower, but the survival rate is higher. The effects of light on the germination of legume can be divided into the promotion, inhibition and no significant three categories. Light intensity promote their germination such as Oxytropis kansuensis, Astragalus adsurgens. Light intensity inhibit the germination of Vicia sativa . But Vicia unijuga, Melilotus officinalis, light intensity have't significant effect. On the whole, compared to ther illumination conditions, Leguminous species survivall showed a significant decline in the minimum illumination. But the planting rate increased significantly with increasing intensity. In this experiment the linear relationship between seed size and seedling emergence rate, survival rate and establishment rate has light-dependent. Olny in the minimum illumination, the seed size will become the limiting factor of seedling emergence and establishment.