中文摘要：

【目的】依据叶绿素荧光动力学对引种的9个越南种源地杉木开展幼龄期优良种源选择。【方法】时间取样为8月中旬8：00-10：00AM,每个种源取样10株,每株杉木取1a生叶和2a生叶,暗反应20min后对各种源叶片叶绿素荧光参数进行分析。【结果】不同种源杉木叶绿素荧光参数表现不一,差异显著,且各种源1a生叶荧光表现普遍优于2a生叶;综合评价各叶绿素荧光参数后可将9个种源划分成3种不同的幼龄期荧光特性类型,其中CL4、CL6、CL5和CL7种源光合作用能力较强。【结论】各杉木种源中,叶绿素荧光特征差异明显,嫩叶比老叶的光合作用能力较强。因此杉木嫩叶绿素荧光可能是杉木种源选择的快速途径。

英文摘要：

【Objective】Base on chlorophyll fluorescence kinetics,good provenances in the early stage of 9Chinese fir（Cunninghamia lanceolata（Hook）Lamb.）provenances were selected.【Method】The samples were taken in 8：00-10：00am.Each provenance had 10 trees and each tree selected 1-and 2-year-old leaves.The leaves were put in the dark box 20 minutes,then chlorophyll fluorescence were analyzed.【Results】Chlorophyll fluorescence parameters were different between provenances.Chlorophyll fluorescence parameters of 1-year-old leaves were generally better than those of 2-year-old leaves.Nine Chinese fir provenances were divided into 3clusters according to fluorescence properties.The photosynthetic capacity were higher in CL4,CL6,CL5 and CL7provenances compared with other provenances.【Conclusion】There were significant differences in chlorophyll fluorescence between different Chinese fir provenances;the photosyn-thetic capacity of new leaves were greater than that of old leaves.Therefore,chlorophyll fluorescence of new leaves may a reference for selecting Chinese fir provenances.