中文摘要：

以紫叶桃、紫叶李、美人梅及紫叶矮樱4种红叶树种为试材,油蟠桃和玉皇李2种绿叶树种为对照,测定其色素含量、反射光谱、光合速率日变化及相关荧光参数。结果表明：红叶树种花青苷的含量显著高于绿叶树种,除美人梅外,叶绿素、类胡萝卜素的含量红叶与绿叶树种无显著差异。红叶和绿叶树种净光合速率日变化均为双峰曲线,均存在光合“午休”现象,但红叶树种的净光合速率低于绿叶树种,且光合“午休”持续时间较绿叶树种短。从叶绿素荧光参数日变化来看,红叶树种与绿叶树种PSⅡ最大光化学效率（Fv/Fm）差异不大,红叶树种实际光化学效率（ΦPSⅡ）、光化学猝灭系数（qP）低于绿叶树种,非光化学猝灭系数（NPQ）高于绿叶树种,热耗散能力较强。

英文摘要：

Content of pigments, reflective spectra, and daily changes of photosynthetic rate and chlorophyll fluorescence parameters were investigated using four red-leaf tree species in Amygdalus and Prunus, including A. persica f. atropurpurea, P. cerasifera ‘ Pissardii＇, P. × bliriana ‘ Meirenmei＇ , P.× cistena ‘ Pissardii＇, and two green-leaf tree species A. persica var. compressa and P. salicina ‘Yuhuangli＇ were included as controls. The results indicated that all red-leaf tree species had higher content of anthocyanins than the green-leaf plants, and difference of total chlorophyll and carotenoid contents were not remarkable except P. × bliriana ‘ Meirenmei＇ . The daily changes of net photosynthetic rate were double-peak curves both in red-leaf and green-leaf tree species, but the net photosynthetic rate was lower in red-leaf tree species than in green-leaf tree species. All tree species have the phenomenon of ‘noon break＇, while the duration was shorter in red-leaf tree species than in green.leaf tree species. There were not differences between red-leaf and green-leaf tree species in intrinsic photochemical efficiency of PS Ⅱ （ Fv/Fm）, but the quantum yield of PS Ⅱ （φPSⅡ ） and photochemical quenching （qp） of red-leaf tree species were lower than those of green-leaf tree species. Non-photochemical quenching （ NPQ ） of red-leaf tree species was higher than that of green-leaf tree species.