Impact of nitrogen addition on plant community in a semi-arid temperate steppe in China Song, Ling ; Bao, Xuemei ; Liu, Xuejun ; Zhang, Fusuo Abstract Publication: Journal of Arid Land Pub Date: January 2012 DOI: 10.3724/SP.J.1227.2012.00003 Bibcode: 2012JArL....4....3S