Thu Mar 1, 2012 4:19pm EST * Gold climbs 5 percent in heavy volume * U.S. natural gas tumble nearly 6 pct * Copper up more than 1 pct in thing dealings * CBOT wheat and corn fall on profit-taking By Marcy Nicholson NEW YORK, March 1 (Reuters) – Gold rebounded above $1,700 an ounce…