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草业学报 ›› 2013, Vol. 22 ›› Issue (6): 100-107.DOI: 10.11686/cyxb20130613

• 研究论文 • 上一篇    下一篇

4种披碱草属植物光合作用光响应特性的比较

祁娟1,师尚礼1,徐长林1,闫伟红2,张小娇1   

  1. 1.甘肃农业大学草业学院 草业生态系统教育部重点实验室 中-美草地畜牧业可持续发展研究中心,甘肃 兰州 730070;
    2.中国农业科学院草原研究所,内蒙古 呼和浩特 010010
  • 出版日期:2013-12-20 发布日期:2013-12-20
  • 通讯作者: 祁娟(1971-),女,甘肃镇原人,副教授,博士。E-mail:qijuan@gsau.edu.cn
  • 作者简介:祁娟(1971-),女,甘肃镇原人,副教授,博士。
  • 基金资助:
    草业生态系统教育部重点实验室(甘肃农业大学)开放课题基金项目(CYZS-2011004)和中央级公益性科研院所基本科研业务费专项(中国农业科学院草原研究所,1610332012209)资助。

A comparison of photosynthesis responses to light of four Elymus species

QI Juan1, SHI Shang-li1, XU Chang-lin1, YAN Wei-hong2, ZHANG Xiao-jiao1   

  1. 1.Pratacultural Collegeof Gansu Agricultural University, Key Laboratory of Grassland Ecology System, Ministry of Eduation, Sino-U.S. Center for Grazingland Ecosystem Sustainability, Lanzhou 730070, China; 2.Grassland Research Institute, CAAS, Huhhot 010010, China
  • Online:2013-12-20 Published:2013-12-20

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摘要： 利用人工模拟光源研究了4种披碱草属植物的光合速率(Pn)、蒸腾速率(Tr)、水分利用效率(WUE)、气孔导度(Gs)、胞间CO2(Ci)浓度及叶面饱和水压亏(Vpdl)随模拟光辐射(SPR)增强的变化规律及其相关性,并计算了各材料表观量子效率及其光饱和点与光补偿点等。结果表明,4种植物的Pn和Tr均随SPR的增强而增大,在相同的光照强度下,麦宾草的光合速率较高,披碱草次之,其他2种材料净光合速率近乎一致。麦宾草和肥披碱草的Tr明显高于老芒麦和披碱草;披碱草属不同材料的WUE随SPR的加强而呈递增规律,其中WUE的大小顺序为老芒麦＞披碱草＞麦宾草＞肥披碱草;4种植物气孔导度均随模拟光辐射强度的升高而增大,麦宾草和披碱草的Gs明显高于其他2种植物;4种植物胞间CO2均随着SPR的增强和Pn的增大而减少。当SPR从0增至500 μmol/(m2·s)时,4种植物Vpdl 有一个小的下降过程,之后除披碱草缓慢下降外,其他材料随SPR增加而缓慢增加,麦宾草和肥披碱草的Vpdl明显高于其他2种材料。老芒麦和麦宾草光补偿点相对较低,说明两者利用弱光的能力相对较强,麦宾草和披碱草光饱和点较高,说明两者利用强光的能力较强。通过综合分析,利用光能的能力高低顺序为:麦宾草＞披碱草＞老芒麦＞肥披碱草,也就是无论在强光或弱光条件下,麦宾草和披碱草利用光能的能力较强。

Abstract: The net photosynthetic rate (Pn), transpiration rate (Tr), water use efficiency (WUE), stomatal conductance (Gs), intercellular CO2 concentration (Ci) and vapor pressure deficit (Vpdl) of four Elymus species were determined under simulated photosynthetic radiation (SPR) and the apparent quantum yield (AQY), light saturation point (LSP) and light compensation point (LCP) were calculated. The Pn and Tr increased with an increase in SPR in all four species. Under the same light intensity, E. tangutorum had the highest Pn of the four species, while E. dahuricus was medium, and the other two species had almost the same Pn. The Tr of E. tangutorum and E. excelsus were significantly higher than those of E. sibiricus and E. dahuricus. The WUE also increased with an increase in SPR, and the order of WUE for the species was E. sibiricus＞E. dahuricus＞E. tangutorum＞E. excelsus. The Gs increased with an increased SPR. The Gs of E. tangutorum and E. dahuricus were significantly higher than those of the other two species. The Ci decreased with increases in SPR and Pn. The Vpdl first dropped with an SPR increase from 0 to 500 μmol/(m2 · s), and except for E. dahuricus, the other two species then showed an increase in the Vpdl with an SPR increase. Overall, the Vpdl of E. tangutorum and E. excelsus were significantly higher than those of the other two species. In addition, E. sibiricus and E. tangutorum had lower LCPs than the other species, indicating their higher ability to use light under low-light conditions. Both E. tangutorum and E. dahuricus had a high LSP among, showing their better ability to use strong light. In conclusion, E. tangutorum and E. dahuricus had a relatively higher capacity for light utilization than E. sibiricus and E. excelsus; that is, they had higher photosynthetic efficiency whether under high or low-light conditions.

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