中文摘要：

以2年生仁用杏为试材,采用盆栽方法,以正常供水（土壤含水量为田间最大持水量的75%）为对照,设置了轻度水分胁迫（55%）、中度水分胁迫（45%）和重度水分胁迫（30%）3个处理,开展了水分胁迫条件下仁用杏叶片光合色素、光合指标及叶绿素荧光参数等光合特性研究。结果表明：水分胁迫不同程度降低了类胡萝卜素含量、叶绿素a、b含量、净光合速率（Pn）、蒸腾速率（Tr）、水分利用效率（WUE）、最大荧光产量（Fm）、最大光化学效率（Fv/Fm）和PSⅡ潜在活性,且下降幅度随着胁迫时间延长而增大;轻度水分胁迫下降幅度很小,中度和重度水分胁迫下降幅度较大。

英文摘要：

Taking 2-year-old‘Chaoren＇kernel-used apricot as test materials,using pot experiments,under different conditions of soil moisture that normal supply（soil moisture was 75% field water holding capacity）,mild water stress（55%）,moderate water stress（45%）and severe water stress（30%）,photosynthetic pigment,photosynthesis,chlorophyll fluorescence parameters were research.The results showed that carotenoid content,chlorophyll a and b content,net photosynthetic rate（Pn）,transpiration rate（Tr）,water use efficiency（WUE）,maximum fluorescence yield（Fm）,the maximal photochemical efficiency（Fv/Fm）and PSⅡ potential activity were decreased under different soil water treatment.As water stress time increased they fell more faster;mild water stress drop was very small,moderate and severe water stress decreased.