1. State Key Laboratory of Black Soils Conservation and Utilization, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, 138 Haping Road, Harbin 150081, PR China
2. Key Laboratory of Poyang Lake Wetland and Watershed Research (Jiangxi Normal University), Ministry of Education, Nanchang 330022, PR China
3. Industrial Crops Institute, Heilongjiang Academy of Agricultural Sciences, Harbin, Heilongjiang Province 150086, PR China