Global pattern of leaf litter nitrogen and phosphorus in woody plantsHongzhang Kang, Zaijun Xin, Björn Berg, Paul J. Burgess, Qunlu Liu, Zhicheng Liu, Zhaohua Li and Chunjiang LiuAnn. For. Sci., 67 8 (2010) 811DOI: https://doi.org/10.1051/forest/2010047