EFFECTS OF ENHANCED UV-B RADIATION ON WATER USE EFFICIENCY, STOMATAL CONDUCTANCE, LEAF NITROGEN CONTENT AND MORPHOLOGICAL CHARACTERISTICS OF SPIRAEA PUBESCENS IN A WARM-TEMPERATE DECIDUOUS BROAD-LEAF FOREST

• 增强UV-B辐射对暖温带落叶阔叶林土庄绣线菊水分利用效率、气孔导度、叶氮素含量及形态特性的影响