1. Key Lab. of Mollisols Agroecology, Northeast Institute of Geography and Agroecology Chinese Academy of Sciences Harbin 150081 China
2. Univ. of Chinese Academy of Sciences Beijing 100049 China
3. Center for Agriculture Univ. of Massachusetts Amherst MA 01003 USA
4. Centre for AgriBioscience La Trobe University Melbourne Campus Bundoora Vic 3086 Australia
5. Key Lab. of Soybean Cultivation of Ministry of Agriculture of China Harbin 150086 China