Effect of Illumination and Exogenous Substance on Spore Germination andSeedling Survival of Pteridium aquilinum Intercropping of Different Silage Maize Cultivars and Alfalfa Copulatory behavior of predacious ladybird Harmonia axyridis (Coleoptera: Coccinellidae) under different illuminative conditions Effect of illumination on nitrogen status in soil plant system Study on Photosynthesis and Water Physiology of Cinnamomum septentrionale Effect of Illumination and Exogenous Substance on Spore Germination andSeedling Survival of Pteridium aquilinum Morphology of Huperzia serrata and Its Stomata Characteristics under Different Light Treatments