科尔沁沙地黄柳(Salix gordejevii)光合特性

马木木; 李熙萌; 石莎; 冯金朝

doi:10.7522/j.issn.1000-694X.2014.00017

中国沙漠 >

2015 , Vol. 35 >Issue 2: 352 - 357

DOI: https://doi.org/10.7522/j.issn.1000-694X.2014.00017

生物与土壤

科尔沁沙地黄柳(Salix gordejevii)光合特性

马木木 ,
李熙萌 ,
石莎 ,
冯金朝

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中央民族大学生命与环境科学学院, 北京 100081

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

收稿日期: 2013-12-10

修回日期: 2014-02-08

网络出版日期: 2015-03-20

基金资助

国家科技支撑计划项目(2007BAC03A08-5)

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Photosynthetic Characteristics of Salix gordejevii in the Horqin Sandy Land

Ma Mumu ,
Li Ximeng ,
Shi Sha ,
Feng Jinzhao

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College of Life and Environmental Science, MinZu University of China, Beijing 100081, China

Received date: 2013-12-10

Revised date: 2014-02-08

Online published: 2015-03-20

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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(P_n)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,P_n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P_n,暗示P_n在其抗旱中的重要性; 气孔导度(G_s)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P_n、E和WUE,而温度(T_a)主要影响G_s; 黄柳PSⅡ的最大光化学效率(F_v/F_m)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

本文引用格式

马木木 , 李熙萌 , 石莎 , 冯金朝 . 科尔沁沙地黄柳(Salix gordejevii)光合特性[J]. 中国沙漠, 2015 , 35(2) : 352 -357 . DOI: 10.7522/j.issn.1000-694X.2014.00017

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 (P_n) represented a single peak curve on 14 July and 6 August, in contrast, the P_n represented a double peak curve on 6 June. The factors which made the decrease of P_n in June included stomatal factor and non-stomatal factor. In July and August, the decrease of P_n was mainly attributed to the non-stomatal factor. The diurnal course of water use efficiency (WUE) was the same as P_n, which implicated the importance of P_n in its drought resistance. Stomatal conductance (G_s) showed a decrease tendency during the measurement period, evaporation rate (E) represented a single peak curve. Photosynthetic active radiation (PAR) influenceed P_n, E, WUE and temperature (T_a) influence G_s. The diurnal courses of maximum photochemical efficiency of PSⅡ (F_v/F_m) 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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