一公顷 = 10000 平方米 http://www.baidu.com/s?ie=gb2312&bs=%D2%BB%B9%AB%C7%EA%3D%C6%BD%B7%BD%C3%D7&sr=&z=&cl=3&f=8&wd=%D2%BB%B9%AB%C7%EA%3D%3F%C6%BD%B7%BD%C3%D7&ct=0