1. Key Laboratory of Vegetation Ecology of Ministry of Education Northeast Normal University Changchun China
2. Key Laboratory of Wetland Ecology and Environment & Jilin Provincial Joint Key Laboratory of Changbai Mountain Wetland and Ecology of Northeast Institute of Geography and Agroecology Chinese Academy of Sciences Changchun China
3. Department of Earth and Environmental Sciences Lehigh University Bethlehem PA USA
4. Institute for Peat and Mire Research of School of Geographical Sciences Northeast Normal University Changchun China
5. School of Environment & State Environment Protection Key Laboratory of Wetland Ecology and Vegetation Restoration Jilin Songnen Grassland Ecosystem National Observation and Research Station Northeast Normal University Changchun China