科尔沁沙地黄柳(Salix gordejevii)光合特性  

Photosynthetic Characteristics of Salix gordejevii in the Horqin Sandy Land

作　　者：马木木 李熙萌[1] 石莎[1] 冯金朝[1] 

机构地区：[1]中央民族大学生命与环境科学学院,北京100081

出　　处：《中国沙漠》2015年第2期352-357,共6页Journal of Desert Research

基　　金：国家科技支撑计划项目(2007BAC03A08-5);国家自然科学基金项目(30570300;30590381-02);中央民族大学"211工程"三期"创新人才培养"项目(0212110309090208)

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Pn、E和WUE,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。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 Pnrepresented a double peak curve on 6 June.The factors which made the decrease of Pnin 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 Pnin 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,WUEand 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 agood adaption ability to its growth environment.

关 键 词：黄柳(Salix gordejevii) 光合“午休” 气体交换特性 最大光化学效率 

分 类 号：Q948.1[生物学—植物学]