The student pilot stated that he was conducting a solo cross-country flight in the tailwheel-equipped airplane. He landed uneventfully at the destination airport, which was equipped with a turf runway, and to which he had flown with his instructor the previous day. After landing, the student pilot taxied the airplane back to the end of the runway to take off. He stated that he applied power to begin the takeoff roll, and the airplane lifted off the ground around 50 miles per hour. The student pilot lowered the airplane's nose to gain airspeed, and the airplane contacted the runway before impacting trees on the right side of the runway. A Federal Aviation Administration inspector, who examined the airplane after the accident, stated the airplane sustained substantial damage to the wing spar, and that there were no mechanical malfunctions or anomalies.