Supported by the National Natural Science Foundation of China(40876010);the"Strategic Priority Research Program-Climate Change:Carbon Budget and Relevant Issues"of the Chinese Academy of Sciences(XDA01020304);the Natural Science Foundation of Jiangsu Province(BK2011042);the Natural Science Foundation of Zhejiang Province(Y6110502);the Foundation of theEducation Department of Fujian Province of China(JA10288);the Natural Science Foundation from the Education Bureau of Anhui Province(KJ2011A135;KJ2011Z003)