摘要
为了解兴安胡枝子(Lespedeza daurica)对不同森林光环境的适应性,分别测定了林下和林缘兴安胡枝子叶片的光合气体交换参数和叶绿素荧光参数的光响应曲线。结果表明,在低光强下,林下兴安胡枝子叶片的净光合速率(Pn)和表观量子效率(AQY)明显高于林缘,即林下兴安胡枝子叶片对弱光的捕获和利用能力明显高于林缘,但林下兴安胡枝子在相对较强光强下的光合能力明显低于林缘,表现为较低的光饱和点(LSP)和净光合速率(Pmax),随着光强的增加而减少,林下兴安胡枝子叶片的气孔导度(Gs)和蒸腾速率(Tr)增加幅度也明显低于林缘,但林下兴安胡枝子具有相对较高的水分利用效率。低光强下,林下和林缘兴安胡枝子叶片的实际光化学效率(ФPSⅡ)和电子传递速率(ETR)均无明显差异,但当光强超过400μmol·m^(-2)·s^(-1)后,林缘兴安胡枝子叶片的ФPSⅡ和ETR均明显高于林下,但是林下兴安胡枝子叶片的热耗散能力明显高于林缘。兴安胡枝子叶片的光合特性对不同光环境具有较强的适应能力。
In order to understand the adaptability of Lespedeza davurica on different forest light environmental,photosynthetic gas exchange and light response curve of chlorophyll fluorescence parameters were detected respectively.The results showed that Pnand AQY of L.davuricaleaf growth in understory were significantly higher than that of the forest edge under low light intensity,which indicated that the ability of capture and utilization of weak light growth in understory were significantly higher than that in the edge of forest.On the contrary,the ability of capture and utilization of strong light growth in understory was significantly lower than that in the edge of forest,in which the value of LSP and Pmaxwere lower.The increased extent of GSand Trof L.davuricaleaves understory were lower than the edge of the forest with increasing the light intensity,but L.davuricagrown in forest has relatively higher water use efficiency.Under low light intensity,the parameters ofФPSⅡ and ETR were both not different between understory and forest edge.But the parameters ofФPSⅡ and ETR for those grown in forest edge were higher than understory when the intensity was more than 400μmol·m^-2·s^-1R and LCP of L.davuricaleaves were significantly higher than those understory.The heat dissipation capability of understory was higher than those grown in forest edge.In conclusion,the results of this study showed that the ability of L.davuricafor adapting different light environments were strong.
出处
《草业科学》
CAS
CSCD
北大核心
2016年第4期706-712,共7页
Pratacultural Science
基金
中央高校基本科研业务费专项资金(2572014AA16)
关键词
兴安胡枝子
光曲线
叶绿素荧光
Lespedeza daurica
light curve
chlorophyll fluorescence
