生态环境学报 ›› 2021, Vol. 30 ›› Issue (10): 1943-1951.DOI: 10.16258/j.cnki.1674-5906.2021.10.001

• 研究论文 •    下一篇

兰州北山不同海拔3种典型绿化树种光合特性研究

刘旻霞*(), 于瑞新, 穆若兰, 夏素娟   

  1. 西北师范大学地理与环境科学学院,甘肃 兰州 730070
  • 收稿日期:2020-10-20 出版日期:2021-10-18 发布日期:2021-12-21
  • 通讯作者: * E-mail: xiaminl@163.com
  • 作者简介:刘旻霞(1972年生),女,教授,博士,主要从事生态恢复方向的研究。E-mail: xiaminl@163.com
  • 基金资助:
    国家自然科学基金项目(31760135);甘肃省自然科学基金项目(20JR10RA089)

Photosynthetic Characteristics of Three Typical Tree Species at Different Altitudes in Beishan, Lanzhou

LIU Minxia*(), YU Ruixin, MU Ruolan, XIA Sujuan   

  1. Northwest Normal University, College of Geography and Environmental Sciences, Lanzhou 730070, China
  • Received:2020-10-20 Online:2021-10-18 Published:2021-12-21

摘要:

光是植物光合作用的基本因子,准确分析光合-光响应曲线及光合参数是研究植物光合生理过程对环境变化响应的重要途径。利用Li-6400XT便携式光合测定仪测定了兰州北山3种典型绿化树种侧柏(Platycladus orientalis)、山桃 (Prunus davidiana)和甘蒙柽柳(Tamarix austromongolica)在不同海拔梯度下的光响应曲线,并计算3个树种的光能利用效率(LUE)及水分利用效率(WUE)。通过光合生理参数探讨3个树种对不同海拔(1600、1800、2000 m)的光合生理适应机制,分析影响3个树种光合速率(Pn)的主要生理生态因子。结果表明,(1)3种绿化树种在海拔2000 m处具有较高的净光合速率(Pnmax)和表观量子效率(AQE),而在海拔1600 m处具有最大的光补偿点(LCP)和暗呼吸速率(Rd)。(2)侧柏、山桃和甘蒙柽柳叶片蒸腾速率(Tr)、气孔导度(Gs)和胞间CO2浓度(Ci)都呈现出随海拔的增加而上升的趋势,不同树种的气孔限制值(Ls)有显著差异。(3)3树种LUE均表现为随海拔的升高而增加;侧柏和甘蒙柽柳的WUE随海拔的升高而降低,而山桃表现为在海拔1800 m处WUE最大。(4)侧柏净光合速率(Pn)与光合有效辐射(PAR)、LUE、WUE呈显著正相关(P<0.05);山桃PnGs、Tr、LUE呈极显著正相关(P<0.01),与WUE呈显著正相关(P<0.05);甘蒙柽柳Pn与LUE、Ts呈极显著正相关(P<0.01),与WUE呈显著正相关关系(P<0.05)。综合分析发现,侧柏耐荫性较强但对光强的适应范围不广,适合栽培在低海拔地区;山桃可以很好利用光能,但其抗旱性能较差;甘蒙柽柳在较大的PAR范围内可以保持良好的WUE,并且其对光能的适应范围较广,可以大面积栽培。

关键词: 兰州北山, 海拔, 绿化树种, 光响应曲线, 光合生理指标

Abstract:

Light is the basic factor of plant photosynthesis. Accurate analysis of the photosynthesis-light response curve and its parameters is an important way to study the response of plant photosynthetic physiological processes to environmental changes. In this study, the light response curve of Platycladus orientalis, Prunus davidiana and Tamarix austromongolica at different altitudes were measured by li-6400xt portable photosynthetic apparatus, and the light energy use efficiency (LUE) and water use efficiency (WUE) of the three tree species were calculated. The photosynthetic physiological adaptation mechanism of three tree species to different altitudes (1600 m, 1800 m, 2000 m) was discussed by photosynthetic physiological parameters, and the main physiological and ecological factors affecting photosynthetic rate (Pn) of three tree species were analyzed. The results showed that: (1) the three tree species had higher net photosynthetic rate (Pnmax) and apparent quantum efficiency (AQE) at the altitude of 2000 m, and the highest light compensation point (LCP) and dark respiration rate (Rd) at the altitude of 1600 m. (2) The transpiration rate (Tr), stomatal conductance (Gs) and intercellular CO2 concentration (Ci) of Platycladus orientalis, Prunus davidiana and Tamarix austromongolica showed an increasing trend with the increase of altitude, and stomatal limit values (Ls) of different tree species were significantly different. (3) The LUE of three tree species increased with the elevation. WUE of Platycladus orientalis and Tamarix austromongolica decreased with the increase of altitude, while that of Prunus davidiana was the highest at 1800m altitude. (4) The net photosynthetic rate (Pn) of Platycladus orientalis was positively correlated with PAR, LUE and WUE (P<0.05). Pn was significantly positively correlated with Gs, Tr and LUE (P<0.01), and positively correlated with WUE (P<0.05). Pn of P. davidiana was significantly positively correlated with Gs, Tr and LUE (P<0.01), and was positively correlated with WUE (P<0.05). Pn of T. austromongolica was significantly positively correlated with LUE and Ts (P<0.01), and was positively correlated with WUE (P<0.05). In general, P. orientalis has strong shade tolerance, but does not adapt to light intensity widely, so it is suitable for cultivation in low altitude areas. P. davidiana can make good use of light energy, but its drought resistance is poor. T. mandshurica can maintain good WUE in a wide range of PAR, and it can adapt to a wide range of light energy, and can be cultivated in a large area.

Key words: Lanzhou Beishan, altitude, greening tree species, light response curve, photosynthetic physiological index

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