Ammonium first: natural mosses prefer atmospheric ammonium but vary utilization of dissolved organic nitrogen depending on habitat and nitrogen deposition
Xue-Yan Liu, Keisuke Koba,*, Akiko Makabe, Xiao-Dong Li, Muneoki Yoh, Cong-Qiang Liu
New Phytologist
http://onlinelibrary.wiley.com/doi/10.1111/nph.12284/abstract