Prediction of the effects of climate change on the potential distribution of mire in Northeastern China Age structure and growth pattern of Polytrichum juniperum populations in a mire of Changbai Mountains Studies on the Sapogenins and Prosapogenins in Ardisia pusilla A. DC Plant Diversity of Sphagnum Mire at Qizimei Mountains in Western Hubei Province N2O flux from the mire in Ruoergai Plateau