2种不同类型的尖叶胡枝子光合-光响应特性研究

Study on photosynthesis and photo-response characteristics of two types of Lespedeza hedysaroides

以黄绿型和浓绿型2种不同类型的尖叶胡枝子Lespedeza hedysaroides为材料,对其叶绿素含量和光合-光响应特性进行了研究。结果表明,2种不同类型尖叶胡枝子的叶绿素含量存在显著差异。浓绿型尖叶胡枝子的最大净光合速率(Amax)、暗呼吸速率(Rd)、表观量子效率(AQY)均高于黄绿型尖叶胡枝子,而光补偿点(LCP)、光饱和点(LSP)低于黄绿型尖叶胡枝子。黄绿型尖叶胡枝子和浓绿型尖叶胡枝子净光合速率(Pn)、胞间CO2浓度(Ci)、气孔导度(Gs)、蒸腾速率(Tr)、水分利用效率(WUE)及叶片温度(Tleaf)对不同光合有效辐射通量密度(PPFD)的响应均有一定程度的差异。

The paper studied the chlorophyll contents, photosynthesis and photo-response characteristics of two different types of L. hedysaroides such as yellow green type and dark green type. The re- sults showed that the chlorophyll contents of two types had significant differences. The maximum net photosynthetic rate（Amax）, dark respiration rate（Rd） and apparent quantum yield（AQY） of dark green type of L. hedysaroides were higher than the yellow green type, and the apparent light compen- sation point（LCP） and light saturation point（LSP） of dark green type were lower than that of the yellow green type. The light radiation net photosynthetic rate（Pn）, interceller CO2 concentration （Ci）, stomatal conductance（Gs）, transpiration rate（Tr）, water use efficiency（WUE） and leaf temperature of the two types showed different responses to the photosynthetic available radiation flux density（PPFD） to some extent.