1. Institute of Grassland Science Northeast Normal University, Key Laboratory of Vegetation Ecology, Ministry of Education, Jilin Songnen Grassland Ecosystem National Observation and Research Station Changchun China
2. Institute of Forage and Grassland Sciences Heilongjiang Academy of Agricultural Sciences Harbin China
3. Department of Botany Government College University Allama Iqbal Road Faisalabad Pakistan
4. Department of Botany University of the Poonch Rawalakot Pakistan