VARIATIONS IN LEAF FUNCTIONAL TRAITS OF SIX SPECIES ALONG A NITROGEN ADDITION GRADIENT IN LEYMUS CHINENSIS STEPPE IN INNER MONGOLIA
WAN Hong-Wei, YANG Yang, BAI Shi-Qin, XU Yun-Hu, BAI Yong-Fei
Chin J Plant Ecol . 2008, (3): 611 -621 .  DOI: 10.3773/j.issn.1005-264x.2008.03.010