Effects of experimental warming on soil N transformations of two coniferous species, Eastern Tibetan Plateau, China

► We compared tree species effects on N transformation under warming. ► We examined root parameters associated with rhizosphere priming effect. ► Warming effects on N availability varied with tree species and seasons. ► Warming stimulated soil N transformations of two tree species plots. ► Warming had a lager effect effects on N cycling in Picea asperata.