7International Geosphere—Biosphere Program Relating Land Use and Global Land Cover Change[R].Stockholm:IGBP report No.24 HDP report NO.5,1993.
8International Geospherc Biosphere Program.Land Use and Land Cover Change,Science/research Plan[R].Stockholm:IGBP report No.35 HDP report No.7,1995.
9International Geosphere-Biosphere Program , Land Use and Land -Cover Change , (I.UCC) Implementation Strategy [R], Stock holm: IGBP report No. 48 and HDP report No. 10.1999.
10Hong, Yanu,Xiubin Li. Cultivated land and food supply in China[J]. Land Use Policy,2000,17:73-88.