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中国沙漠 ›› 2015, Vol. 35 ›› Issue (2): 352-357.DOI: 10.7522/j.issn.1000-694X.2014.00017

• 生物与土壤 • 上一篇    下一篇

科尔沁沙地黄柳(Salix gordejevii)光合特性

马木木, 李熙萌, 石莎, 冯金朝   

  1. 中央民族大学 生命与环境科学学院, 北京 100081
  • 收稿日期:2013-12-10 修回日期:2014-02-08 出版日期:2015-03-20 发布日期:2015-03-20
  • 通讯作者: 冯金朝(Email: fengjinchao@muc.edu.cn)
  • 作者简介:马木木(1989-), 男(回族), 宁夏人, 硕士研究生, 主要从事植物生理生态研究。Email: muc_mumu0305@hotmail.com
  • 基金资助:

    国家科技支撑计划项目(2007BAC03A08-5)

Photosynthetic Characteristics of Salix gordejevii in the Horqin Sandy Land

Ma Mumu, Li Ximeng, Shi Sha, Feng Jinzhao   

  1. College of Life and Environmental Science, MinZu University of China, Beijing 100081, China
  • Received:2013-12-10 Revised:2014-02-08 Online:2015-03-20 Published:2015-03-20

摘要:

采用LI-6400型便携式光合仪及PAM-2100型荧光仪,在2010 年生长季节对科尔沁沙地黄柳(Salix gordejevii)的气体交换特性和最大光化学效率的日变化进行了测定。结果显示:黄柳净光合速率(Pn)曲线在6月6日呈双峰型,在7月14日和8月6日呈单峰型,Pn下降的因素在6月6日包括气孔因素和非气孔因素,7月14日和8月6日则以非气孔因素为主; 水分利用效率(WUE)日变化趋势同Pn,暗示Pn在其抗旱中的重要性; 气孔导度(Gs)在测量期间呈递减趋势; 蒸腾速率(E)呈单峰曲线; 光照(PAR)主要影响PnEWUE,而温度(Ta)主要影响Gs; 黄柳PSⅡ的最大光化学效率(Fv/Fm)日变化呈单峰曲线,值为0.75~0.85,显示出对生长环境良好的适应能力。

关键词: 黄柳(Salix gordejevii), 光合“午休”, 气体交换特性, 最大光化学效率

Abstract:

In this study, gas exchange characteristics and maximum photochemical efficiency of Salix gordejevii were measured with LI-6400 portable photosynthetic system and PAM-2100 portable chlorophyll fluorometer. The results showed that the diurnal courses of photosynthetic rate (Pn) represented a single peak curve on 14 July and 6 August, in contrast, the Pn represented a double peak curve on 6 June. The factors which made the decrease of Pn in June included stomatal factor and non-stomatal factor. In July and August, the decrease of Pn was mainly attributed to the non-stomatal factor. The diurnal course of water use efficiency (WUE) was the same as Pn, which implicated the importance of Pn in its drought resistance. Stomatal conductance (Gs) showed a decrease tendency during the measurement period, evaporation rate (E) represented a single peak curve. Photosynthetic active radiation (PAR) influenceed Pn, E, WUE and temperature (Ta) influence Gs. The diurnal courses of maximum photochemical efficiency of PSⅡ (Fv/Fm) had a single peak curve with the average value of diurnal courses between 0.75~0.85 during the measurement period suggesting a good adaption ability to its growth environment.

Key words: Salix gordejevii, midday depression of photosynthesis, gas exchange characteristic, maximum photochemical efficiency

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