In order for the fire to cast light on the trees you'll need to use a light source too. The luminous and glow effects don't cast light. For a simple representation use a single point light. Disable the lights lens flare and change its colour so its yellow. If you want a slightly better representation of the fire (but that will take longer to render) use multiple light sources distributed around the area where the spheres with the fire texture are. Give each light a slightly different shade of yellow, red or orange. If the fire is hot place a light that is more white towards the middle of the fire. Set their power to be lower than if you were using only one light source but don't make them all the same power. Turn off lens flare on all the lights. This will give the fire's light a fuller feel casting more varied and interesting shadows.

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