The private certificated pilot was departing from an open area of tundra, which was about 800 feet long by 600 feet wide. He said the wind was from the southeast about 10 to 15 knots, and he began a takeoff toward the southeast. The pilot said that just after liftoff, a few feet in the air, the airplane encountered a downdraft. The left wing struck the ground, and the airplane collided with the ground and nosed over. The airplane received damage to both wings, the fuselage, empennage, and propeller.