Light Response Photosynthesis Characteristics of Zhenzhuyouxing Apricot under Different Soil Water Conditions Response of Growth Dynamics of Two Spring Geophytes to Light Regime in a Lime-Beech Forest Light response characteristics of photosynthesis of four xerophilous shrubs under different soil moistures Short-term responses of photosynthesis to elevated CO2 in leaves of canopy species Castanopsis patelliformis in tropical mountain rain forest in Jianfengling, Hainan Island