AFTER LANDING ON A SNOW COVERED RIDGE, THE PILOT TURNED THE AIRPLANE AROUND TO TAKE OFF DOWNWIND AND DOWN SLOPE. AFTER THE AIRPLANE LIFTED OFF AND ATTAINED AN ALTITUDE OF 10 FEET AGL, THE PILOT FELT THE AIRPLANE STALL. THE PILOT NOSED THE AIRPLANE DOWN TO INCREASE THE AIRSPEED. THE PILOT THEN PULLED THE NOSE OF THE AIRPLANE UP, WHICH AGAIN STALLED. THE PILOT WAS UNABLE TO ATTAIN ENOUGH AIRSPEED TO MAINTAIN ALTITUDE AND OPTED TO ABORT THE TAKEOFF. DURING THE DESCENT IN THE CANYON, THE AIRPLANE COLLIDED WITH THE TREES.