[1]Key Laboratory of Mollisols Agroecology;
Northeast Institute of Geography and Agroecology;
Chinese Academy of Sciences;
Harbin 150081;
P.R.China;
[2]College of Agronomy;
Northeast Agricultural University;
Harbin 150030;
P.R. China;
[3]Faculty of Agriculture;
Kagoshima University;
Kagoshima 890-0065;
Japan;