国家自然科学基金重大项目41590841;全国生态环境十年变化2000-2010年遥感调查与评估项目STSN-12-01;环境保护部专项2110203资助 This work was supported by the Major Project of the National Natural Science Foundation of China41590841;the Chinese Ecosystem Assessment from 2000-2010 based on Remote SensingSTSN-12-01;the Special Project of Ministry of Environmental Protection2110203